6-K - ERO - Equibles

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 6-K

Report of Foreign Private Issuer

Pursuant to Rule 13a-16 or 15d-16

under the Securities Exchange Act of 1934

For the month of May 2025

Commission File Number 001-40459

ERO COPPER CORP.

(Translation of registrant's name into English)

625 Howe Street, Suite 1050

Vancouver, British Columbia V6C 2T6

Canada

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F:

Form 20-F ☐ Form 40-F ☒

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1).

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7).

Exhibits 99.1, 99.2 and 99.3 of this Form 6-K is incorporated by reference as an additional exhibit to the registrant’s Registration Statement on Form S-8 (File NO. 333-264821) and Registration Statement on Form F-10 (File NO. 333-274097).

Signatures

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	Ero Copper Corp.
	By:	/s/ Deepk Hundal
		Name: Deepk Hundal
		Title: EVP, General Counsel and Corporate Secretary
Date: May 5, 2025

Exhibit Index

Exhibit Number	Description of Document
99.1	Management’s Discussion and Analysis for the three months ended March 31, 2025
99.2	Condensed Consolidated Financial Statements for the three months ended March 31, 2025
99.3	Press Release dated May 5, 2025

Document

MANAGEMENT’S DISCUSSION

AND ANALYSIS

FOR THE THREE MONTHS ENDED

MARCH 31, 2025

1050 – 625 Howe Street, Vancouver, B.C., Canada V6C 2T6

Phone: 604-449-9244 | Website: www.erocopper.com | Email: info@erocopper.com

TABLE OF CONTENTS
BUSINESS OVERVIEW	1
HIGHLIGHTS	2
REVIEW OF OPERATIONS
The Caraíba Operations	5
The Tucumã Operation	6
The Xavantina Operations	7
2025 GUIDANCE	8
REVIEW OF FINANCIAL RESULTS
Review of quarterly results	10
Summary of quarterly results for most recent eight quarters	12
OTHER DISCLOSURES
Liquidity, Capital Resources, and Contractual Obligations	13
Management of Risks and Uncertainties	15
Other Financial Information	19
Accounting Policies, Judgments and Estimates	19
Capital Expenditures	20
Alternative Performance (NON-IFRS) Measures	21
Disclosure Controls and Procedures and Internal Control over Financial Reporting	30
Notes and Cautionary Statements	30

Ero Copper Corp. March 31, 2025 MD&A

MANAGEMENT’S DISCUSSION AND ANALYSIS

This Management’s Discussion and Analysis (“MD&A”) has been prepared as at May 5, 2025 and should be read in conjunction with the unaudited condensed consolidated interim financial statements of Ero Copper Corp. (“Ero”, the “Company”, or “we”) as at, and for the three months ended March 31, 2025, and related notes thereto, which are prepared in accordance with International Accounting Standards (“IAS”) 34, Interim Financial Reporting as permitted by the International Financial Reporting Standards (“IFRS”) as issued by the International Accounting Standards Board (the “IASB”). All references in this MD&A to “Q1 2025” and “Q1 2024” are to the three months ended March 31, 2025 and March 31, 2024, respectively. As well, this MD&A should be read in conjunction with the Company’s December 31, 2024 audited consolidated financial statements and MD&A. All dollar amounts are expressed in United States (“US”) dollars and tabular amounts are expressed in thousands of US dollars, unless otherwise indicated. References to “$”, “US$”, “dollars”, or “USD” are to US dollars, references to “C$” are to Canadian dollars, and references to “R$” or “BRL” are to Brazilian Reais.

This MD&A refers to various alternative performance (Non-IFRS) measures, including copper C1 cash cost, copper C1 cash cost including foreign exchange hedges, realized copper price, gold C1 cash cost, gold all-in sustaining cost (“AISC”), realized gold price, EBITDA, adjusted EBITDA, adjusted net income attributable to owners of the Company, adjusted net income per share attributable to owners of the Company, net (cash) debt, working capital and available liquidity. Please refer to the section titled "Alternative Performance (Non-IFRS) Measures" for a discussion of non-IFRS measures.

This MD&A contains “forward‐looking statements” that are subject to risk factors set out in a cautionary note contained at the end of this MD&A. The Company cannot assure investors that such statements will prove to be accurate, and actual results and future, events may differ materially from those anticipated in such statements. The results for the periods presented are not necessarily indicative of the results that may be expected for any future period. Investors are cautioned not to place undue reliance on such forward-looking statements. All information contained in this MD&A is current and has been approved by the Board of Directors of the Company (the “Board”) as of May 5, 2025, unless otherwise stated.

BUSINESS OVERVIEW

Additional information on the Company and its operations, including technical reports on the Caraíba Operations, Xavantina Operations and Tucumã Operation, can be found on SEDAR+ (www.sedarplus.ca/landingpage/) and on EDGAR (www.sec.gov). The Company’s shares are publicly traded on the Toronto Stock Exchange and the New York Stock Exchange under the symbol “ERO”.

Ero Copper Corp. March 31, 2025 MD&A | Page 1

HIGHLIGHTS

Operating Highlights

	2025 - Q1		2024 - Q4		2024 - Q1
Copper (Caraíba Operations)
Ore Processed (tonnes)	692,901		719,942		853,371
Grade (% Cu)	1.18		1.30		1.08
Cu Production (tonnes)	7,357		8,566		8,091
Cu Production (lbs)	16,219,125		18,883,286		17,837,530
Cu Sold in Concentrate (tonnes)	6,949		8,420		9,461
Cu Sold in Concentrate (lbs)	15,318,111		18,562,541		20,858,592
Cu C1 Cash Cost(1)(2)	$	2.22	$	1.85	$	2.30
Copper (Tucumã Operation)
Ore Processed (tonnes)	294,314		223,013		—
Grade (% Cu)	2.18		2.17		—
Cu Production (tonnes)	5,067		4,317		—
Cu Production (lbs)	11,170,823		9,515,937		—
Cu Sold in Concentrate (tonnes)	5,168		3,750		—
Cu Sold in Concentrate (lbs)	11,393,490		8,268,310		—
Total Copper
Cu Production (tonnes)	12,424		12,883		8,091
Cu Production (lbs)	27,389,948		28,399,223		17,837,530
Cu Sold in Concentrate (tonnes)	12,117		12,170		9,461
Cu Sold in Concentrate (lbs)	26,711,601		26,830,851		20,858,592
Gold (Xavantina Operations)
Ore Processed (tonnes)	33,228		26,120		37,834
Grade (g / tonne)	6.87		11.18		16.38
Au Production (oz)	6,638		8,936		18,234
Au Sold (oz)	5,834		11,106		16,853
Au C1 Cash Cost(1)	$	1,100	$	744	$	395
Au AISC(1)	$	2,228	$	1,691	$	797

(1) Please refer to the section titled "Alternative Performance (Non-IFRS) Measures" within this MD&A.

(2) Copper C1 cash cost including foreign exchange hedges was $2.36 in Q1 2025 (Q1 2024 - $2.28).

Ero Copper Corp. March 31, 2025 MD&A | Page 2

Financial Highlights

($ in millions, except per share amounts)

	2025 - Q1		2024 - Q4		2024 - Q1
Revenues	$	125.1	$	122.5	$	105.8
Gross profit	55.5		52.4		31.2
EBITDA(1)	117.9		(31.4)		17.8
Adjusted EBITDA(1)	63.2		59.1		43.3
Cash flow from operations	65.4		60.8		17.2
Net income (loss)	80.6		(48.9)		(6.8)
Net income (loss) attributable to owners of the Company	80.2		(48.9)		(7.1)
- Per share (basic)	0.77		(0.47)		(0.07)
- Per share (diluted)	0.77		(0.47)		(0.07)
Adjusted net income attributable to owners of the Company(1)	35.8		17.4		16.8
- Per share (basic)	0.35		0.17		0.16
- Per share (diluted)	0.35		0.17		0.16
Cash, cash equivalents, and short-term investments	80.6		50.4		51.7
Working capital (deficit)(1)	10.2		(69.9)		(28.6)
Available liquidity(1)	115.6		90.4		156.7
Net debt(1)	561.8		551.8		415.1

Q1 2025 Highlights

Increased production from the Tucumã Operation and higher metal prices contributed to quarter-on-quarter improvements in financial results

•The continued commissioning and ramp-up of the Tucumã Operation drove strong quarterly copper production of 12,424 tonnes.

◦The Tucumã Operation produced 5,067 tonnes of copper in concentrate, with more than half of production occurring in March following the completion of planned maintenance in January and February.

◦The Caraíba Operations produced 7,357 tonnes of copper in concentrate at an average C1 cash cost(1) of $2.22 per pound during the quarter. The Company achieved targeted mining rates at the Pilar Mine in March 2025 and successfully mobilized a second underground development contractor during the quarter.

•The Xavantina Operations produced 6,638 ounces of gold during the quarter at an average C1 cash cost(1) and AISC(1) of $1,100 and $2,228 per ounce, respectively.

•Quarterly financial performance benefited from higher metal prices and increased production from the Tucumã Operation, which more than offset the impact of lower gold production during the period.

◦Net income attributable to the owners of the Company for the quarter was $80.2 million ($0.77 per share on a diluted basis).

(1) Please refer to the section titled "Alternative Performance (Non-IFRS) Measures" within this MD&A.

Ero Copper Corp. March 31, 2025 MD&A | Page 3

◦Adjusted net income attributable to the owners of the Company(1) for the quarter was $35.8 million ($0.35 per share on a diluted basis).

◦First quarter adjusted EBITDA(1) was $63.2 million.

•During the quarter, the Company opportunistically entered into zero-cost copper collar contracts on 3,000 tonnes of copper per month from April 2025 to September 2025. These contracts establish an average floor price of $4.00 per pound of copper and an average ceiling price of of $4.68 per pound.

•In March 2025, the Company entered into an agreement with RGLD Gold AG, a wholly-owned subsidiary of Royal Gold Inc., that effectively extends the gold delivery threshold under the June 2021 Precious Metals Purchase Agreement (the "Xavantina Gold Stream") from 93,000 to 160,000 ounces before the stream percentage decreases from 25% to 10% of gold produced over the remaining life of mine. In exchange, the Company received $50 million in upfront cash, bringing total proceeds under the streaming agreements to $160 million. For more information, please see the Company's press release dated March 31, 2025.

•At quarter-end, available liquidity was $115.6 million, including $80.6 million in cash and cash equivalents and $35.0 million of undrawn availability under the Company's senior secured revolving credit facility ("Senior Credit Facility").

The Company is reaffirming its 2025 production, operating cost and capital expenditure guidance

•Copper production is expected to increase sequentially over the remaining quarters of the year.

◦The Tucumã Operation remains on track to achieve commercial production in H1 2025, following the successful completion of repairs to and commissioning of the third tailings filter in April 2025.

◦At the Caraíba Operations, the Company completed the mobilization of a second underground development contractor and achieved targeted mining rates at the Pilar Mine in March 2025, which are expected to be sustained through the rest of the year.

•At the Xavantina Operations, higher processed tonnage and improved gold grades are projected to support increased gold production and lower unit operating costs through the balance of the year.

•Full-year capital expenditure guidance has been reaffirmed at $230 to $270 million.

Drilling and engineering progress at the Furnas Copper-Gold Project ("Furnas")

•Since commencing the Phase 1 drill program in mid-October 2024, the Company has completed approximately 10,000 meters of drilling through the end of Q1 2025, including approximately 7,200 meters during the quarter. As of mid-April, eight drills were active on site, supporting an average drilling rate of over 1,000 meters a week.

•The Company remains on track to complete the 28,000-meter Phase 1 drill program in Q3 2025 and the majority of the 17,000-meter Phase 2 drill program by year-end 2025. Exploration efforts are focused on two high-grade zones within the overall mineralized trend, known as the NW and SE Zones. Drilling in 2025 includes:

◦Infill drilling to upgrade mineral resource classifications and target improved continuity within high-grade zones

(1) Please refer to the section titled "Alternative Performance (Non-IFRS) Measures" within this MD&A.

Ero Copper Corp. March 31, 2025 MD&A | Page 4

◦Extensional drilling to depth, where the deposit remains open

•Geometallurgical and comminution circuit validation testwork also commenced during the quarter to support the preliminary economic assessment on Furnas, which the Company plans to publish in H1 2026.

REVIEW OF OPERATIONS

The Caraíba Operations

	2025 - Q1		2024 - Q4		2024 - Q1
Ore mined (tonnes)	696,239		713,980		788,332
Ore processed (tonnes)	692,901		719,942		853,371
Grade (% Cu)	1.18		1.30		1.08
Recovery (%)	90.2		91.8		88.1
Cu Production (tonnes)	7,357		8,566		8,091
Cu Production (lbs)	16,219,125		18,883,286		17,837,530
Concentrate grade (% Cu)	32.3		32.8		32.7
Concentrate sales (tonnes)	21,622		25,743		28,721
Cu Sold in concentrate (tonnes)	6,949		8,420		9,461
Cu Sold in concentrate (lbs)	15,318,111		18,562,541		20,858,592
Realized copper price	$	4.06	$	3.82	$	3.74
Copper C1 cash cost	$	2.22	$	1.85	$	2.30
Copper C1 cash cost including foreign exchange hedges	$	2.36	$	2.07	$	2.28

The Caraíba Operations produced 7,357 tonnes of copper in concentrate during the quarter at a C1 cash cost of $2.22 per pound of copper produced. Including the impact of allocated foreign exchange hedges, C1 cash costs during the period were $2.36 per pound.

Copper production decreased quarter-on-quarter primarily due to lower planned mined and processed copper grades. The Company successfully mobilized a second underground development contractor at during the quarter and achieved targeted mining rates at the Pilar Mine in March 2025, which the Company expects to maintain through the remainder of the year.

Copper production from the Caraíba Operations is expected to total between 37,500 to 42,500 tonnes in 2025, with production anticipated to increase sequentially through year-end, driven by quarter-on-quarter improvements in mined and processed volumes. The Company is maintaining its full-year 2025 copper C1 cash cost guidance for the Caraíba Operations of $2.15 to $2.35 per pound of copper produced.

Ero Copper Corp. March 31, 2025 MD&A | Page 5

The Tucumã Operation

	2025 - Q1		2024 - Q4
Ore mined (tonnes)	328,291		1,065,108
Ore processed (tonnes)	294,314		223,013
Grade (% Cu)	2.18		2.17
Recovery (%)	89.4		89.1
Cu Production (tonnes)	5,067		4,317
Cu Production (lbs)	11,170,823		9,515,937
Concentrate grade (% Cu)	30.3		28.6
Concentrate sales (tonnes)	16,279		13,384
Cu Sold in concentrate (tonnes)	5,168		3,750
Cu Sold in concentrate (lbs)	11,393,490		8,268,310
Realized copper price	$	4.09	$	3.48

Commissioning and ramp-up of the Tucumã Operation progressed during Q1 2025 with a 32% quarter-on-quarter increase in ore tonnes processed. In January and February, the Company completed planned maintenance shutdowns to address throughput bottlenecks identified in H2 2024. These efforts contributed to strong operating performance in March, which accounted for more than 50% of the quarter's total plant throughput and copper production.

In April 2025, the Company successfully completed repairs to and commissioning of the third tailings filter. As a result, the Tucumã Operation remains on track to achieve commercial production in H1 2025, with full-year copper production expected to total between 37,500 to 42,500 tonnes. Production is anticipated to increase sequentially throughout the year, with higher mill throughput volumes expected to offset a gradual decline in processed copper grades.

The Company is maintaining its full-year 2025 copper C1 cash cost guidance for the Tucumã Operation of $1.05 to $1.25 per pound of copper produced. C1 cash costs for the Tucumã Operation will be reported following the achievement of commercial production.

Ero Copper Corp. March 31, 2025 MD&A | Page 6

The Xavantina Operations

	2025 - Q1		2024 - Q4		2024 - Q1
Ore mined (tonnes)	33,228		26,119		37,834
Ore processed (tonnes)	33,228		26,120		37,834
Head grade (grams per tonne Au)	6.87		11.18		16.38
Recovery (%)	90.8		92.8		91.5
Gold ounces produced (oz)	6,638		8,936		18,234
Silver ounces produced (oz)	3,996		5,654		10,209
Gold sold (oz)	5,834		11,106		16,853
Silver sold (oz)	3,761		6,426		9,086
Realized gold price(1)	$	2,705	$	2,080	$	1,920
Gold C1 cash cost	$	1,100	$	744	$	395
Gold AISC	$	2,228	$	1,691	$	797

(1) Realized Au price includes the effect of ounces sold under the stream arrangement with Royal Gold. See "Realized Gold Price" section of "Non-IFRS Measures" for detail.

The Xavantina Operations produced 6,638 ounces of gold during the quarter at a C1 cash cost of $1,100 and an AISC of $2,228 per ounce. Although tonnes mined and processed increased by 27.2% quarter-on-quarter, gold production declined due to lower mined and processed grades. While decreased production levels were anticipated in the first quarter, grades encountered within planned operational levels during the period were slightly lower than expected. Additional ground support required in several newly developed higher-grade levels of Santo Antônio delayed mining activities within these areas, further impacting quarterly gold production.

Gold production from the Xavantina Operations is expected to total between 50,000 to 60,000 ounces in 2025. Ongoing investments in mine modernization and mechanization are anticipated to support sequential increases in mined and processed volumes through the remainder of the year. Gold grades are also expected to improve over the balance of the year, supporting higher production levels and lower unit costs.

The Company is maintaining its full-year 2025 gold C1 cash cost guidance for the Xavantina Operations of $650 to $800 per ounce of gold produced as well as its full-year 2025 gold AISC guidance range of $1,400 to $1,600 per ounce of gold produced.

Ero Copper Corp. March 31, 2025 MD&A | Page 7

2025 GUIDANCE

Consolidated copper production for 2025 is expected to increase sequentially each quarter, with full-year production projected to range between 75,000 and 85,000 tonnes. At the Tucumã Operation, production is anticipated to increase sequentially throughout the year, with higher mill throughput volumes expected to offset a gradual decline in processed copper grades. At the Caraíba Operations, the Company achieved targeted mining rates at the Pilar Mine in March 2025 and completed the mobilization of a second underground development contractor during the quarter. As a result, higher mined and processed tonnage is expected to be sustained for the remainder of the year.

At the Xavantina Operations, the Company is also reaffirming production guidance of 50,000 to 60,000 ounces with higher processed tonnage and improved gold grades projected to support increased gold production and lower unit operating costs through the balance of the year.

2025 Production and Cost Guidance

Consolidated Copper Production (tonnes)
Caraíba Operations	37,500 - 42,500
Tucumã Operation	37,500 - 42,500
Total Copper	75,000 - 85,000
Consolidated Copper C1 Cash Cost(1) Guidance
Caraíba Operations	$2.15 - $2.35
Tucumã Operation	$1.05 - $1.25
Consolidated Copper Operations	$1.55 - $1.80
The Xavantina Operations
Au Production (ounces)	50,000 - 60,000
Gold C1 Cash Cost(1) Guidance	$650 - $800
Gold AISC(1) Guidance	$1,400 - $1,600

Note: Guidance is based on estimates and assumptions including, but not limited to, mineral reserve estimates, grade and continuity of interpreted geological formations and metallurgical recovery performance. Please refer to the Company’s SEDAR+ and EDGAR filings, including the most recent Annual Information Form ("AIF"), for a detailed summary of risk factors.

(1) Please refer to the section titled "Alternative Performance (Non-IFRS) Measures" within this MD&A.

Ero Copper Corp. March 31, 2025 MD&A | Page 8

2025 Capital Expenditure Guidance

Capital expenditure guidance remains unchanged at a range of $230 to $270 million, excluding capitalized ramp-up costs prior to the declaration of commercial production at the Tucumã Operation.

Figures presented in the table below are in USD millions.

Caraíba Operations	$165 - $180
Tucumã Operation(1)	$30 - $40
Xavantina Operations	$25 - $35
Furnas Copper-Gold Project and Other Exploration	$10 - $15
Total	$230 - $270

(1) Excludes capitalized ramp-up costs prior to the declaration of commercial production at the Tucumã Operation.

Ero Copper Corp. March 31, 2025 MD&A | Page 9

REVIEW OF FINANCIAL RESULTS

The following table provides a summary of the financial results of the Company for Q1 2025 and Q1 2024. Tabular amounts are in thousands of US dollars, except share and per share amounts.

		Three months ended March 31,
	Notes	2025		2024
Revenue	1	$	125,088	$	105,793
Cost of sales	2	(69,566)		(74,616)
Gross profit		55,522		31,177
Expenses
General and administrative	3	(11,371)		(11,514)
Share-based compensation		(1,173)		(6,545)
Income before the undernoted		42,978		13,118
Finance income		838		1,468
Finance expense	4	(4,723)		(4,634)
Foreign exchange gain (loss)	5	58,400		(18,996)
Other (expenses) income		(2,125)		361
Income (loss) before income taxes		95,368		(8,683)
Income tax (expense) recovery
Current		(3,718)		(3,330)
Deferred		(11,023)		5,183
	6	(14,741)		1,853
Net income (loss) for the period		$	80,627	$	(6,830)
Other comprehensive gain (loss)
Foreign currency translation gain (loss)	7	45,775		(24,680)
Comprehensive income (loss)		$	126,402	$	(31,510)
Net income (loss) per share attributable to owners of the Company
Basic		$	0.77	$	(0.07)
Diluted		$	0.77	$	(0.07)
Weighted average number of common shares outstanding
Basic		103,564,654		102,769,444
Diluted		103,904,737		102,769,444

Ero Copper Corp. March 31, 2025 MD&A | Page 10

Notes:

1. Revenues from copper sales in Q1 2025 was $109.5 million (Q1 2024 - $73.9 million) on sale of 26.7 million lbs of copper (Q1 2024 - 20.9 million lbs). The increase in copper revenues was primarily attributed to $46.2 million of incremental revenue from the Tucumã Operations, higher average realized prices, partially offset by lower quantity sold at Caraíba.

Revenues from gold sales in Q1 2025 was $15.6 million (Q1 2024 - $31.9 million) on sale of 5,834 ounces of gold (Q1 2024 - 16,853 ounces) at an average realized price of $2,705 per ounce (Q1 2024 - $1,920 per ounce). The decrease in gold revenues was attributable to the decrease in sales volume, partially offset by a higher realized gold price.

2. Cost of sales for Q1 2025 from copper sales was $59.5 million (Q1 2024 - $61.6 million) which primarily comprised of $16.0 million (Q1 2024 - $13.2 million) in salaries and benefits, $14.7 million (Q1 2024 - $17.6 million) in depreciation and depletion, $10.2 million (Q1 2024 - $8.7 million) in materials and consumables, $8.8 million (Q1 2024 - $6.7 million) in maintenance costs, $6.3 million (Q1 2024 - $6.5 million) in contracted services, $3.6 million (Q1 2024 - $1.8 million) in sales expenses, $3.6 million (Q1 2024 - $3.1 million) in utilities, and $4.1 million decrease (Q1 2024 - $3.9 million increase) in changes in inventories. Cost of sales in Q1 2025 was relatively unchanged from Q1 2024, as the decrease in cost of sales at the Caraíba Operations due to a 26% decrease in sales volume was mostly offset by the incremental cost of sales from the Tucumã Operations, which commenced commission in June 2024.

Cost of sales for Q1 2025 from gold sales was $10.1 million (Q1 2024 - $13.0 million) which primarily comprised of $3.6 million (Q1 2024 - $5.3 million) in depreciation and depletion, $2.9 million (Q1 2024 - $2.6 million) in salaries and benefits, $1.9 million (Q1 2024 - $2.0 million) in contracted services, $1.5 million (Q1 2024 - $1.7 million) in materials and consumables, $0.7 million (Q1 2024 - $0.6 million) in maintenance costs, $0.5 million (Q1 2024 - $0.6 million) in utilities, and $1.3 million decrease (Q1 2024 - $0.3 million decrease) in change in inventories. The decrease in cost of sales as compared to Q1 2024 was primarily due to a decrease in gold ounces sold.

3. General and administrative expenses for Q1 2025 was primarily comprised of $6.5 million (Q1 2024 - $6.0 million) in salaries and consulting fees, $2.3 million (Q1 2024 - $2.3 million) in office and administration expenses, $1.1 million (Q1 2024 - $1.7 million) in incentive payments, $0.7 million (Q1 2024 - $0.7 million) in other costs, and $0.4 million (Q1 2024 - $0.4 million) in accounting and legal costs. General and administrative expenses were primarily consistent from Q1 2024 to Q1 2025. Lower incentive payments were offset by higher consulting fees mainly attributed to transaction fees incurred with the Xavantina Gold Stream.

4. Finance expense for Q1 2025 was $4.7 million (Q1 2024 - $4.6 million) and was primarily comprised of other finance expense of $2.7 million (Q1 2024 - $2.9 million), accretion of deferred revenue of $0.6 million (Q1 2024 - $0.7 million), accretion of asset retirement obligations of $0.8 million (Q1 2024 - $0.6 million), and lease interest of $0.6 million (Q1 2024 - $0.4 million). $11.0 million (Q1 2024 - $7.4 million) in borrowing costs which were capitalized to projects in progress. Finance expense remained relatively unchanged from Q1 2024, as interest on new loans and borrowings were capitalized to projects in progress.

5. Foreign exchange gain for Q1 2025 was $58.4 million (Q1 2024 - $19.0 million loss). This amount is primarily comprised of $45.1 million (Q1 2024 - $12.8 million loss) in foreign exchange gain on USD denominated debt at MCSA for which the functional currency is the BRL, $16.8 million (Q1 2024 - $9.3 million loss) of unrealized foreign exchange gain on derivative contracts, and partially offset by $2.2 million (Q1 2024 - $2.1 million gain) of realized foreign exchange loss on derivative contracts and other foreign exchange losses of $1.3 million (Q1 2024 - $1.0 million gains). The unrealized foreign exchange gain on USD denominated debt and on derivative contracts was a result of a 8% strengthening of the BRL against the USD during the period.

6. In Q1 2025, the Company recognized $14.7 million in income tax expense (Q1 2024 a recovery of $1.9 million). The increase in income tax expense was primarily a result of an increase in income before taxes as compared to loss before taxes in the same quarter of the prior year.

7. The foreign currency translation gain is a result of a fluctuation of the BRL against the USD during Q1 2025, which strengthened from approximately 6.19 BRL per US dollar at the beginning of Q1 2025 to approximately 5.74 BRL per US dollar by the end of the quarter, when translating the net assets of the Company’s Brazilian subsidiaries to USD for presentation in the Company’s condensed consolidated interim financial statements.

Ero Copper Corp. March 31, 2025 MD&A | Page 11

SUMMARY OF QUARTERLY RESULTS

The following table presents selected financial information for each of the most recent eight quarters. Tabular amounts are in millions of US Dollars, except share and per share amounts.

Selected Financial Information		Mar. 31,(1)			Dec. 31,(2)			Sep. 30,(3)			Jun. 30,(4)			Mar. 31,(5)			Dec. 31,(6)			Sep. 30,(7)			Jun. 30,(8)
	2025			2024			2024			2024			2024			2023			2023			2023
Revenue		$	125.1		$	122.5		$	124.8		$	117.1		$	105.8		$	116.4		$	105.2		$	104.9
Cost of sales		$	(69.6)		$	(70.2)		$	(71.1)		$	(73.8)		$	(74.6)		$	(74.6)		$	(69.7)		$	(65.5)
Gross profit		$	55.5		$	52.4		$	53.7		$	43.3		$	31.2		$	41.9		$	35.5		$	39.4
Net income (loss) for period		$	80.6		$	(48.9)		$	41.4		$	(53.4)		$	(6.8)		$	37.1		$	2.8		$	29.9
Income (loss) per share attributable to owners of the Company
- Basic		$	0.77		$	(0.47)		$	0.40		$	(0.52)		$	(0.07)		$	0.37		$	0.03		$	0.32
- Diluted		$	0.77		$	(0.47)		$	0.39		$	(0.52)		$	(0.07)		$	0.37		$	0.03		$	0.32
Weighted average number of common shares outstanding
- Basic		103,564,654			103,345,064			103,239,881			103,082,363			102,769,444			98,099,791			93,311,434			92,685,916
- Diluted		103,904,737			103,345,064			103,973,827			103,082,363			102,769,444			98,482,755			94,009,268			93,643,447

Notes:

1.During Q1 2025, the Company recognized net income of $80.6 million compared to net loss of $48.9 million in the preceding quarter. The increase in net income was primarily attributable to foreign exchange gains of $58.4 million compared to foreign exchange losses of $92.8 million in the preceding quarter, partially offset by an income tax expense of $14.7 million compared to an income tax recovery of $5.9 million in the preceding quarter.

2.During Q4 2024, the Company recognized net loss of $48.9 million compared to net income of $41.4 million in the preceding quarter. The decrease in net income was primarily attributable to foreign exchange losses of $92.8 million compared to foreign exchange gains of $17.2 million in the preceding quarter, partially offset by income tax recovery of $5.9 million compared to income tax expense of $8.3 million in the preceding quarter.

3.During Q3 2024, the Company recognized net income of $41.4 million compared to net loss of $53.4 million in the preceding quarter. The increase in net income was primarily attributable to higher revenues, as well as foreign exchange gains of $17.2 million compared to foreign exchange losses of $70.5 million in the preceding quarter, as well as a $10.7 million write-down in exploration and evaluation assets recognized in the preceding quarter.

4.During Q2 2024, the Company recognized net loss of $53.4 million compared to net loss of $6.8 million in the preceding quarter. The increase in loss was primarily attributable to foreign exchange losses of $70.5 million compared to $19.0 million in the preceding quarter. The change in foreign exchange gain or loss was primarily driven by volatility of the Brazilian Real against the US Dollar during the respective periods. In addition, during the quarter, the Company terminated the Fides option agreement, resulting in a write-down in exploration and evaluation assets of $10.7 million.

5.During Q1 2024, the Company recognized net loss of $6.8 million compared to net income of $37.1 million in the preceding quarter. The decrease in income was primarily attributable to foreign exchange losses of $19.0 million compared to foreign exchange gains of $24.9 million in the preceding quarter. The change in foreign exchange gain or loss was primarily driven by volatility of the Brazilian Real against the US Dollar during the respective periods.

Ero Copper Corp. March 31, 2025 MD&A | Page 12

6.During Q4 2023, the Company recognized net income of $37.1 million compared to $2.8 million in the preceding quarter. The increase was primarily attributable to foreign exchange gains of $24.9 million compared to foreign exchange losses of $13.9 million in the preceding quarter. The change in foreign exchange gain or loss was primarily driven by volatility of the Brazilian Real against the US Dollar during the respective periods.

7.During Q3 2023, the Company recognized net income of $2.8 million compared to $29.9 million in the preceding quarter. The decrease was primarily attributable to foreign exchange losses of $13.9 million compared to foreign exchange gain of $15.1 million in the preceding quarter. The change in foreign exchange gain or loss was primarily driven by volatility of the Brazilian Real against the US Dollar during the respective periods.

8.During Q2 2023, the Company recognized net income of $29.9 million compared to $24.5 million in the preceding quarter. The increase was primarily attributable to an increase in foreign exchange gain and the recognition of an unrealized gain in copper derivative contracts.

LIQUIDITY, CAPITAL RESOURCES, AND CONTRACTUAL OBLIGATIONS

Liquidity

As at March 31, 2025, the Company had cash and cash equivalents of $80.6 million and available liquidity of $115.6 million. Cash and cash equivalents were primarily comprised of cash held with reputable financial institutions and are invested in highly liquid short-term investments with maturities of three months or less. The funds are not exposed to liquidity risk and there are no restrictions on the ability of the Company to use these funds to meet its obligations.

Cash and cash equivalents increased by $30.2 million from December 31, 2024. The Company’s cash flows from operating, investing, and financing activities for the three months ended March 31, 2025, are summarized as follows:

•Cash from operating activities of $65.4 million, primarily consists of:

◦$63.2 million of adjusted EBITDA (see Non-IFRS Measures); and

◦$50.0 million of advance from Xavantina Gold Stream;

net of:

◦$42.8 million of net change in non-cash working capital items;

◦$2.2 million of amortization of non-cash deferred revenues;

◦$2.2 million of derivative contract settlements; and

◦$0.4 million of income taxes paid.

•Cash from financing activities of $23.0 million, primarily consists of:

◦$55.3 million of new loans and borrowings; and

◦$0.2 million of proceeds from exercise of stock options;

net of:

◦$16.9 million of interest paid on loans and borrowings;

◦$9.5 million of principal repayments on loans and borrowings; and

◦$4.0 million of lease payments.

Ero Copper Corp. March 31, 2025 MD&A | Page 13

•Cash used in investing activities of $59.0 million, including:

◦$56.4 million of additions to mineral property, plant and equipment; and

◦$3.1 million of additions to exploration and evaluation assets;

net of:

◦$0.5 million in proceeds from interest received.

As at March 31, 2025, the Company had working capital of $10.2 million.

Capital Resources

The Company’s primary sources of capital are comprised of cash from operations, and cash and cash equivalents on hand. The Company continuously monitors its liquidity position and capital structure and, based on changes in operations and economic conditions, may adjust such structure by issuing new common shares or new debt as necessary. Taking into consideration expected cash flow from existing operations and available liquidity, management believes that the Company has sufficient capital to fund its planned operations and activities, and other initiatives, for the foreseeable future.

At March 31, 2025, the Company had available liquidity of $115.6 million, including $80.6 million in cash and cash equivalents and $35.0 million of undrawn availability under its Senior Credit Facility.

In January 2025, the Company amended its Senior Credit Facility to increase the limit from $150.0 million to $200.0 million and to extend the maturity from December 2026 to December 2028. The interest rate and commitment fee on the Credit Facility were reduced to sliding scales of SOFR plus 2.00% to 4.25%, and 0.45% to 0.96%, respectively. Additionally, the total leverage ratio was replaced with net leverage ratio for purposes of determining financial covenants and interest rates.

In May 2024, to support the commencement of production and associated working capital needs at the Tucumã Operation, the Company entered into a $50.0 million non-priced copper prepayment facility, structured by the Bank of Montreal and with participation by CIBC Capital Markets. This facility is being repaid over 27 equal monthly installments, beginning in October 2024, through the delivery of 272 tonnes of copper each month. Each monthly delivery's value is being determined based on prevailing market copper prices at the time of delivery. Should the value of any delivery exceed the amount of the monthly installment payment of $2.1 million, the excess value will be repaid to the Company. The copper to be delivered by the Company will be in the form of LME Copper Warrants.

In March 2025, the Company exercised its option to increase the size of the non-priced copper prepayment facility by an additional $25.0 million. The Company is obligated to repay the $25.0 million additional facility over 21 equal monthly installments, beginning in April 2025, through the delivery of a minimum of 161 tonnes of copper each month. The copper to be delivered by the Company will be in the form of LME Copper Warrants. Each monthly delivery's value will be determined based on prevailing market copper prices at the time of delivery. Should the value of any delivery exceed the amount of the monthly installment payment of $1.3 million, the excess value will be repaid to the Company.

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In relation to its loans and borrowings, the Company is required to comply with certain financial covenants. As of the date of the condensed consolidated interim financial statements, the Company is in compliance with these covenants. The loan agreements also contain covenants that could restrict the ability of the Company and its subsidiaries, MCSA, Ero Gold, and NX Gold, to, among other things, incur additional indebtedness needed to fund its respective operations, pay dividends or make other distributions, make investments, create liens, sell or transfer assets or enter into transactions with affiliates. There are no other restrictions or externally imposed capital requirements of the Company.

Contractual Obligations and Commitments

The Company has precious metals purchase agreements with a wholly-owned subsidiary of Royal Gold, Inc., whereby the Company is obligated to sell a portion of its gold production from the Xavantina Operations at contract prices.

Refer to the "Liquidity Risk" section for further information on the Company's contractual obligations and commitments.

MANAGEMENT OF RISKS AND UNCERTAINTIES

The Company thoroughly examines the various financial instruments and risks to which it is exposed and assesses the impact and likelihood of those risks. These risks may include credit risk, liquidity risk, currency risk, commodity price risk and interest rate risk. Where material, these risks are reviewed and monitored by the Board.

Credit risk

Credit risk is the risk of financial loss to the Company if a customer or counterparty to a financial instrument fails to meet its contractual obligations and arises principally from the Company’s receivables from customers. The carrying amount of the financial assets below represents the maximum credit risk exposure as at March 31, 2025 and December 31, 2024:

	March 31, 2025		December 31, 2024
Cash and cash equivalents	80,573		$	50,402
Accounts receivable	63,606		18,399
Derivatives	271		—
Note receivable	11,983		12,009
Deposits and other assets	5,104		4,961
	$	161,537	$	85,771

Ero Copper Corp. March 31, 2025 MD&A | Page 15

The Company invests cash and cash equivalents with financial institutions that are financially sound based on their credit rating.

The Company’s exposure to credit risk associated with accounts receivable is influenced mainly by the individual characteristics of each customer.

In 2022, one of the Company's customers in Brazil, Paranapanema S/A ("PMA"), filed for bankruptcy protection. As a preferred supplier to PMA, the Company had a note receivable arrangement with PMA, which was excluded from the judicial recovery process and provides the Company with certain judicial guarantees. According to the note receivable arrangement, repayment was structured over 24 monthly installments beginning in March 2024, with an annual interest rate equivalent to Brazil's CDI rate of approximately 11.65%.

At March 31, 2025, PMA continued to be in default of the agreement and the gross amount of accounts and note receivable from PMA was $22.5 million (December 31, 2024 - $20.7 million). Accordingly, the note receivable is considered credit impaired, and the Company recorded a credit loss provision and present value discount of $14.1 million (December 31, 2024 - $13.1 million). The carrying value of the PMA note receivable at March 31, 2025 was $8.4 million (December 31, 2024 - $7.6 million.), of which $4.4 million (December 31, 2024 - $3.9 million) was included in other current assets. No adjustment was recorded to the credit loss provision in the three months ended March 31, 2025 (provision of $1.9 million for the three months ended March 31, 2024).

Liquidity risk

Liquidity risk is the risk associated with the difficulties that the Company may have meeting the obligations associated with financial liabilities that are settled with cash payments or with another financial asset. The Company's approach to liquidity management is to ensure as much as possible that sufficient liquidity exists to meet their maturity obligations on the expiration dates, under normal and stressful conditions, without causing unacceptable losses or with risk of undermining the normal operation of the Company.

The table below shows the Company's maturity of non-derivative financial liabilities on March 31, 2025:

Non-derivative financial liabilities	Carrying <br>value		Contractual cash flows		Up to <br>12 months		1 - 2 <br>years		3 - 5 <br>years		More than <br>5 years
Loans and borrowings (including interest)	$	642,339	$	829,503	$	89,901	$	111,845	$	627,757	$	—
Accounts payable and accrued liabilities	128,737		129,884		129,884		—		—		—
Other non-current liabilities	6,990		16,453		—		15,463		604		386
Leases	22,389		24,575		15,446		8,797		333		—
Total	$	800,455	$	1,000,415	$	235,231	$	136,105	$	628,694	$	386

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As at March 31, 2025, the Company has capital commitments, which is net of advances to suppliers, of $55.5 million through contracts and purchase orders which are expected to be incurred over a six-year period. In the normal course of operations, the Company may also enter into long-term contracts which can be cancelled with certain agreed customary notice periods without material penalties.

The Company also has a derivative financial liability for foreign exchange collar contracts whose notional amounts and maturity information are disclosed below under foreign exchange currency risk.

Foreign exchange currency risk

The Company’s subsidiaries in Brazil are exposed to exchange risks primarily related to the US dollar. In order to minimize currency mismatches, the Company monitors its cash flow projections considering future sales expectations indexed to US dollar variation in relation to the cash requirement to settle the existing financings.

The Company's exposure to foreign exchange currency risk at March 31, 2025 relates to $77.5 million (December 31, 2024 – $60.0 million) in loans and borrowings of MCSA denominated in US dollars and Euros. In addition, the Company is also exposed to foreign exchange currency risk at March 31, 2025 on $568.2 million of intercompany loan balances (December 31, 2024 - $513.6 million) which have contractual repayment terms. Strengthening (weakening) in the Brazilian Real against the US dollar at March 31, 2025 by 10% and 20%, would have decreased (increased) pre-tax net loss by $64.5 million and $129.0 million, respectively. This analysis is based on the foreign currency exchange variation rate that the Company considered to be reasonably possible at the end of the period and excluding the impact of the derivatives below. The analysis assumes that all other variables, especially interest rates, are held constant.

The Company may use certain foreign exchange derivatives, including collars and forward contracts, to manage its foreign exchange risks. A summary of the Company's foreign exchange derivatives at March 31, 2025 is summarized as follows:

Purpose	Notional Amount	Denomination	Weighted average floor	Weighted average cap / forward price	Maturities
Operational costs	$332.5 million	USD/BRL	5.52	6.49	April 2025 - June 2026
Total	$332.5 million	USD/BRL	5.52	6.49	April 2025 - June 2026

The aggregate fair value of the Company's foreign exchange derivatives was a net liability of $1.8 million (December 31, 2024 - liability of $17.9 million).The fair values of foreign exchange contracts were determined based on option pricing models, forward foreign exchange rates, and information provided by the counter party.

The change in fair value of foreign exchange derivatives was a gain of $16.8 million for the three months ended March 31, 2025 (a loss of $9.3 million for the three months ended March 31, 2024), which has been recognized in foreign exchange gain (loss).

In addition, during the three months ended March 31, 2025, the Company recognized a realized loss of $2.2 million (realized gain of $2.1 million for the three months ended March 31, 2024) related to the settlement of foreign currency forward collar contracts.

Ero Copper Corp. March 31, 2025 MD&A | Page 17

Interest rate risk

The Company is principally exposed to the variation in interest rates on loans and borrowings with variable rates of interest. Management reduces interest rate risk exposure by entering into loans and borrowings with fixed rates of interest or by entering into derivative instruments that fix the ultimate interest rate paid.

The Company is principally exposed to interest rate risk through its Senior Credit Facility and Brazilian Real denominated bank loans. Based on the Company’s net exposure at March 31, 2025, a 1% change in the variable rates would not materially impact its pre-tax annual net income.

Price risk

The Company may use derivatives, including forward contracts, collars and swap contracts, to manage commodity price risks.

At March 31, 2025, the Company had copper collar contracts on 3,000 tonnes of copper per month from April 2025 to September 2025. These copper derivative contracts establish an average floor price of $4.00 per pound of copper and an average cap price of 4.68 per pound. As of March 31, 2025, the fair value of these contracts was a net liability of $1.3 million (December 31, 2024 - nil). The fair value of copper collar contracts was determined based on option pricing models, forward copper price and information provided by the counter party.

At March 31, 2025, the Company also had gold collar contracts on 2,500 ounces of gold per month from April 2025 to December 2025. These gold derivative contracts establish an average floor price of $2,200 per ounce of gold and an average cap price of $3,425 per ounce. As of March 31, 2025, the fair value of these contracts was a net liability of $0.9 million (December 31, 2024 - $0.1 million). The fair value of gold collar contracts was determined based on option pricing models, forward gold price, and information provided by counter party.

During the three months ended March 31, 2025, the Company recognized an unrealized loss of $2.1 million (unrealized gain of $0.1 million for the three months ended March 31, 2024) and nil realized impact (nil for the three months ended March 31, 2024) in relation to its commodity derivatives in other income or loss.

At March 31, 2025, the Company had provisionally priced sales that are exposed to commodity price changes. Based on the Company’s net exposure at March 31, 2025, a 10% change in the price of copper would have changed pre-tax net income (loss) $11.0 million.

For a discussion of additional risks applicable to the Company and its business and operations, including risks related to the Company’s foreign operations, the environment and legal proceedings, see “Risk Factors” in the Company’s AIF.

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OTHER FINANCIAL INFORMATION

Off-Balance Sheet Arrangements

As at March 31, 2025, the Company had no material off-balance sheet arrangements.

Outstanding Share Data

As of May 5, 2025, the Company had 103,572,066 common shares issued and outstanding.

ACCOUNTING POLICIES, JUDGMENTS AND ESTIMATES

Critical Accounting Judgments and Estimates

The preparation of condensed consolidated interim financial statements in conformity with IFRS requires management to make judgments, estimates and assumptions about future events that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. Although these estimates are based on management’s best knowledge of the amount, events or actions, actual results may differ from these estimates.

The Company’s material accounting policies and accounting estimates are contained in the Company’s consolidated financial statements for the year ended December 31, 2024 and condensed consolidated interim financial statements for the three months ended March 31, 2025. Judgements have been made in the determination of the functional currency of the Company and its subsidiaries, assessment of the probability of cash outflow related to legal claims and contingent liabilities, and commencement of commercial production. Certain of the Company's accounting policies, such as derivative instruments, deferred revenue, carrying amounts of mineral properties, provision for mine closure and reclamation costs, income tax including tax uncertainties, expected credit losses involve critical accounting estimates. Certain of these estimates are dependent on mineral reserves and resource information. Changes in mineral reserves and resources could impact depreciation and depletion rates, asset carrying amounts and the timing of mine closure and reclamation costs. The Company determines its mineral reserves and resources based on information compiled by competent individuals. Information regarding mineral reserves and resources is used in the calculation of depreciation, depletion and determination, when applicable, of the recoverable amount of CGUs, and for forecasting the timing of reclamation and closure cost expenditures. There are numerous uncertainties inherent in the determination of mineral reserves, and assumptions that are valid at the time of determination may change significantly when new information becomes available. Changes in the methodology, forecasted prices of commodities, exchange rates, production costs or recovery rates may change the economic status of mineral reserves and may, ultimately, result in changes in the mineral reserves.

Management continuously reviews its estimates, judgments and assumptions on an ongoing basis using the most current information available. Revisions to estimates are recognized prospectively.

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CAPITAL EXPENDITURES

The following table presents capital expenditures at the Company’s operations on an accrual basis and are net of any sales and value-added taxes.

	2025 - Q1		2024 - Q1
Caraíba Operations
Growth	$	11,149	$	19,731
Sustaining	21,436		14,267
Exploration	2,434		4,599
Deposit on Projects	(615)		3,007
Total, Caraíba Operations	$	34,404	$	41,604
Tucumã Project
Growth	1,160		56,781
Sustaining	1,597		—
Capitalized ramp-up costs	12,005		—
Exploration	904		10
Deposit on Projects	(214)		(6,752)
Total, Tucumã Project	$	15,452	$	50,039
Xavantina Operations
Growth	—		57
Sustaining	3,904		3,064
Exploration	845		1,314
Deposit on Projects	69		(29)
Total, Xavantina Operations	$	4,818	$	4,406
Corporate and Other
Growth	293		—
Exploration	2,642		1,134
Deposit on Projects	(8)		(10)
Total, Corporate and Other	$	2,927	$	1,124
Consolidated
Growth	$	12,602	$	76,569
Sustaining	26,937		17,331
Capitalized ramp-up costs	12,005		—
Exploration	6,825		7,057
Deposit on Projects	(768)		(3,784)
Total, Consolidated Capital Expenditures	$	57,601	$	97,173

Ero Copper Corp. March 31, 2025 MD&A | Page 20

	2025 - Q1		2024 - Q1
Total, Consolidated Capital Expenditures	$	57,601	$	97,173
Add (less):
Additions to exploration and evaluation assets	(3,109)		(1,201)
Additions to right-of-use assets	7,175		4,034
Capitalized depreciation	94		574
Realized foreign exchange (loss) gain on capital expenditure hedges	—		1,688
Total, additions per Mineral Properties, Plant and Equipment note	$	61,761	$	102,268

ALTERNATIVE PERFORMANCE (NON-IFRS) MEASURES

The Company utilizes certain alternative performance (non-IFRS) measures to monitor its performance, including copper C1 cash cost, copper C1 cash cost including foreign exchange hedges, realized copper price, gold C1 cash cost, gold AISC, realized gold price, EBITDA, adjusted EBITDA, adjusted net income attributable to owners of the Company, adjusted net income per share, net (cash) debt, working capital and available liquidity. These performance measures have no standardized meaning prescribed within generally accepted accounting principles under IFRS and, therefore, amounts presented may not be comparable to similar measures presented by other mining companies. These non-IFRS measures are intended to provide supplemental information and should not be considered in isolation or as a substitute for measures of performance prepared in accordance with IFRS. The tables below provide reconciliations of these non-IFRS measures to the most directly comparable IFRS measures as contained in the Company’s financial statements.

Unless otherwise noted, the non-IFRS measures presented below have been calculated on a consistent basis for the periods presented.

Copper C1 Cash Cost and Copper C1 Cash Cost including Foreign Exchange Hedges

Copper C1 cash cost and copper C1 cash cost including foreign exchange hedges are non-IFRS performance measures used by the Company to manage and evaluate the performance of its copper mining operations.

Copper C1 cash cost is calculated as C1 cash costs divided by total pounds of copper produced during the period. C1 cash costs comprise the total cost of production, including expenses related to transportation, and treatment and refining charges. These costs are net of by-product credits, incentive payments and certain tax credits associated with sales invoiced to the Company's Brazilian customer.

Copper C1 cash cost including foreign exchange hedges is calculated as C1 cash costs, adjusted for realized gains or losses from its operational foreign exchange hedges, divided by total pounds of copper produced during the period. Although the Company does not apply hedge accounting in its consolidated financial statements and recognizes these contracts at fair value through profit or loss, the Company believes it appropriate to present cash costs including the impact of realized gains and losses as these contracts were entered into to mitigate the impact of changes in exchange rates.

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While copper C1 cash cost is widely reported in the mining industry as a performance benchmark, it does not have a standardized meaning and is disclosed as a supplement to IFRS measures.

The following table provides a reconciliation of copper C1 cash cost to cost of production, its most directly comparable IFRS measure.

Reconciliation:	2025 - Q1		2024 - Q4		2024 - Q1
Cost of production	$	35,719	$	33,685	$	42,227
Add (less):
Transportation costs & other	1,322		1,149		1,252
Treatment, refining, and other	2,410		2,934		5,170
By-product credits	(4,699)		(5,163)		(2,440)
Incentive payments	(1,289)		1,127		(1,199)
Net change in inventory	2,659		927		(3,893)
Foreign exchange translation and other	(147)		168		(7)
C1 cash costs(1)	35,975		34,827		41,110
Loss (gain) on foreign exchange hedges	2,216		4,166		(276)
C1 cash costs including foreign exchange hedges	$	38,191	$	38,993	$	40,834
	2025 - Q1		2024 - Q4		2024 - Q1
---	---	---	---	---	---	---
Costs
Mining	$	25,796	$	24,906	$	25,256
Processing	6,352		6,580		7,177
Indirect	6,116		5,570		5,947
Production costs	38,264		37,056		38,380
By-product credits	(4,699)		(5,163)		(2,440)
Treatment, refining and other	2,410		2,934		5,170
C1 cash costs(1)	35,975		34,827		41,110
Loss (gain) on foreign exchange hedges	2,216		$	4,166	$	(276)
C1 cash costs including foreign exchange hedges	$	38,191	$	38,993	$	40,834

(1) Copper C1 cash costs for 2025 and 2024 do not include Tucumã Operation's results, as commercial production has not been achieved as of March 31, 2025.

Ero Copper Corp. March 31, 2025 MD&A | Page 22

	2025 - Q1		2024 - Q4		2024 - Q1
Costs per pound
Total copper produced (lbs, 000)	16,219		18,883		17,838
Mining	$	1.59	$	1.32	$	1.42
Processing	$	0.39	$	0.35	$	0.40
Indirect	$	0.38	$	0.29	$	0.33
By-product credits	$	(0.29)	$	(0.27)	$	(0.14)
Treatment, refining and other	$	0.15	$	0.16	$	0.29
Copper C1 cash costs(1)	$	2.22	$	1.85	$	2.30
Loss (gain) on foreign exchange hedges	$	0.14	$	0.22	$	(0.02)
Copper C1 cash costs including foreign exchange hedges	$	2.36	$	2.07	$	2.28

(1) Copper C1 cash costs for 2025 and 2024 do not include Tucumã Operation's results, as commercial production has not been achieved as of March 31, 2025.

Realized Copper Price

Realized copper price is a non-IFRS ratio which is calculated as gross copper revenue divided by pounds of copper sold during the period. Management believes measuring realized copper price enables investors to better understand performance based on realized copper sales in each reporting period.

The following tables provide a calculation of realized copper price and a reconciliation to copper segment.

The Caraíba Operations

Reconciliation:	2025 - Q1		2024 - Q4		2024 - Q1
Copper revenue(1)	$	63,270	$	71,673	$	73,856
less: by-product credits	(4,699)		(5,163)		(2,440)
Net copper revenue	58,571		66,510		71,416
add: treatment, refining and other	2,410		2,934		5,170
add: royalty taxes	1,136		1,391		1,359
Gross copper revenue	62,117		70,835		77,945
Total copper sold in concentrate (lbs, 000)	15,318		18,563		20,859
Realized copper price	$	4.06	$	3.82	$	3.74

(1) Copper revenue includes provisional price and volume adjustments

Ero Copper Corp. March 31, 2025 MD&A | Page 23

The Tucumã Operation

Reconciliation:	2025 - Q1		2024 - Q4
Copper revenue(1)	$	46,232	$	28,080
less: by-product credits	(553)		—
Net copper revenue	45,679		28,080
add: treatment, refining and other	79		146
add: royalty taxes	856		589
Gross copper revenue	46,614		28,815
Total copper sold in concentrate (lbs, 000)	11,393		8,268
Realized copper price	$	4.09	$	3.48

(1) Copper revenue includes provisional price and volume adjustments

Gold C1 Cash Cost and Gold AISC

Gold C1 cash cost is a non-IFRS performance measure used by the Company to manage and evaluate the operating performance of its gold mining segment and is calculated as C1 cash costs divided by total ounces of gold produced during the period. C1 cash cost includes total cost of production, net of by-product credits and incentive payments. Gold C1 cash cost is widely reported in the mining industry as benchmarks for performance but does not have a standardized meaning and is disclosed in supplemental to IFRS measures.

Gold AISC is an extension of gold C1 cash cost discussed above and is also a key performance measure used by management to evaluate operating performance of its gold mining segment. Gold AISC is calculated as AISC divided by total ounces of gold produced during the period. AISC includes C1 cash costs, site general and administrative costs, accretion of mine closure and rehabilitation provision, sustaining capital expenditures, sustaining leases, and royalties and production taxes. Gold AISC is widely reported in the mining industry as benchmarks for performance but does not have a standardized meaning and is disclosed in supplement to IFRS measures.

The following table provides a reconciliation of gold C1 cash cost and gold AISC to cost of production, its most directly comparable IFRS measure.

Ero Copper Corp. March 31, 2025 MD&A | Page 24

Reconciliation:	2025 - Q1		2024 - Q4		2024 - Q1
Cost of production	$	6,225	$	9,000	$	7,255
Add (less):
Incentive payments	(269)		(434)		(443)
Net change in inventory	1,339		(1,914)		264
By-product credits	(111)		(189)		(189)
Smelting and refining	35		62		90
Foreign exchange translation and other	82		125		232
C1 cash costs	$	7,301	$	6,650	$	7,209
Site general and administrative	1,077		1,576		1,353
Accretion of mine closure and rehabilitation provision	141		78		92
Sustaining capital expenditure	3,909		4,597		3,254
Sustaining lease payments	2,021		1,681		2,122
Royalties and production taxes	338		526		510
AISC	$	14,787	$	15,108	$	14,540
	2025 - Q1		2024 - Q4		2024 - Q1
---	---	---	---	---	---	---
Costs
Mining	$	3,760	$	3,325	$	3,820
Processing	2,206		2,162		2,259
Indirect	1,411		1,290		1,229
Production costs	7,377		6,777		7,308
Smelting and refining costs	35		62		90
By-product credits	(111)		(189)		(189)
C1 cash costs	$	7,301	$	6,650	$	7,209
Site general and administrative	1,077		1,576		1,353
Accretion of mine closure and rehabilitation provision	141		78		92
Sustaining capital expenditure	3,909		4,597		3,254
Sustaining leases	2,021		1,681		2,122
Royalties and production taxes	338		526		510
AISC	$	14,787	$	15,108	$	14,540

Ero Copper Corp. March 31, 2025 MD&A | Page 25

Costs per ounce
Total gold produced (ounces)	6,638		8,936		18,234
Mining	$	566	$	372	$	209
Processing	$	332	$	242	$	124
Indirect	$	213	$	144	$	67
Smelting and refining	$	5	$	7	$	5
By-product credits	$	(16)	$	(21)	$	(10)
Gold C1 cash cost	$	1,100	$	744	$	395
Gold AISC	$	2,228	$	1,691	$	797

Realized Gold Price

Realized gold price is a non-IFRS ratio that is calculated as gross gold revenue divided by ounces of gold sold during the period. Management believes measuring realized gold price enables investors to better understand performance based on the realized gold sales in each reporting period. The following table provides a calculation of realized gold price and a reconciliation to gold segment revenues, its most directly comparable IFRS measure.

(in '000s except for ounces and price per ounce)	2025 - Q1		2024 - Q4		2024 - Q1
Xavantina revenue	$	15,586	$	22,786	$	31,937
less: by-product credits	(111)		(189)		(189)
Gold revenue, net	$	15,475	$	22,597	$	31,748
add: smelting, refining, and other charges	304		507		605
Gold revenue, gross	$	15,779	$	23,104	$	32,353
Spot (cash)	$	12,754	$	21,069	$	24,529
Stream (cash)	$	779	$	1,788	$	1,901
Stream (amortization of deferred revenue)(1)	$	2,246	$	247	$	5,923
Total gold ounces sold	5,834		11,106		16,853
Spot	4,467		7,770		12,298
Stream	1,367		3,336		4,555
Realized gold price (per ounce)	$	2,705	$	2,080	$	1,920
Spot	$	2,855	$	2,712	$	1,995
Stream (cash + amortization of deferred revenue)(1)	$	2,213	$	610	$	1,718
Cash (spot cash + stream cash)	$	2,320	$	2,058	$	1,568

(1) Amortization of deferred revenue during the three months ended March 31, 2025 was net of $0.5 million (three months ended December 31, 2024 - $4.2 million) related to change in estimate attributed to advances received and change in life-of-mine production estimates.

Ero Copper Corp. March 31, 2025 MD&A | Page 26

Earnings before interest, taxes, depreciation, and amortization (“EBITDA”) and Adjusted EBITDA

EBITDA and adjusted EBITDA are non-IFRS performance measures used by management to evaluate its debt service capacity and performance of its operations. EBITDA represents earnings before finance expense, finance income, income taxes, depreciation and amortization. Adjusted EBITDA is EBITDA before the pre-tax effect of adjustments for non-cash and/or non-recurring items required in determination of EBITDA for covenant calculation purposes.

The following table provides a reconciliation of EBITDA and Adjusted EBITDA to net income, its most directly comparable IFRS measure.

Reconciliation:	2025 - Q1		2024 - Q4		2024 - Q1
Net Income (Loss)	$	80,627	$	(48,928)	$	(6,830)
Adjustments:
Finance expense	4,723		3,851		4,634
Finance income	(838)		(690)		(1,468)
Income tax expense (recovery)	14,741		(5,862)		(1,853)
Amortization and depreciation	18,620		20,265		23,296
EBITDA	$	117,873	$	(31,364)	$	17,779
Foreign exchange (gain) loss	(58,400)		92,804		18,996
Share based compensation	1,173		(7,496)		6,545
Unrealized loss (gain) on commodity derivatives	2,102		(250)		(64)
Change in rehabilitation and closure provision(1)	—		4,609		—
Write-down of exploration and evaluation asset	—		839		—
Xavantina Gold Stream transaction fees	458		—		—
Adjusted EBITDA	$	63,206	$	59,142	$	43,256

(1) Change in rehabilitation and closure provision relates to revisions to rehabilitation and closure plans and cost estimates at the Company’s historic mining operations that have entered the closure phase, and for which there are no substantive future economic value. Such costs are reflected within other expenses on the Company's Consolidated Statements of Operations and Comprehensive (Loss) Income.

Ero Copper Corp. March 31, 2025 MD&A | Page 27

Adjusted net income attributable to owners of the Company and Adjusted net income per share attributable to owners of the Company

“Adjusted net income attributable to owners of the Company” is net income attributed to shareholders as reported, adjusted for certain types of transactions that, in management's judgment, are not indicative of our normal operating activities or do not necessarily occur on a recurring basis. “Adjusted net income per share attributable to owners of the Company” (“Adjusted EPS”) is calculated as "adjusted net income attributable to owners of the Company" divided by weighted average number of outstanding common shares in the period. The Company believes that, in addition to conventional measures prepared in accordance with IFRS, the Company and certain investor and analysts use these supplemental non-IFRS performance measures to evaluate the normalized performance of the Company. The presentation of Adjusted EPS is not meant to substitute the net income (loss) per share attributable to owners of the Company (“EPS”) presented in accordance with IFRS, but rather it should be evaluated in conjunction with such IFRS measures.

The following table provides a reconciliation of Adjusted net income attributable to owners of the Company and Adjusted EPS to net income attributable to the owners of the Company, its most directly comparable IFRS measure.

Reconciliation:	2025 - Q1		2024 - Q4		2024 - Q1
Net income (loss) as reported attributable to the owners of the Company	$	80,227	$	(48,944)	$	(7,141)
Adjustments:
Share based compensation	1,173		(7,496)		6,545
Unrealized foreign exchange (gain) loss on USD denominated balances in MCSA	(39,628)		66,971		11,257
Unrealized foreign exchange (gain) loss on foreign exchange derivative contracts	(16,739)		15,182		9,304
Unrealized loss (gain) on commodity derivatives	2,079		(243)		(64)
Change in rehabilitation and closure provision(1)	—		4,591		—
Write-down of exploration and evaluation asset	—		836		—
Xavantina Gold Stream transaction fees	458		—		—
Tax effect on the above adjustments	8,279		(13,459)		(3,128)
Adjusted net income attributable to owners of the Company	$	35,849	$	17,438	$	16,773
Weighted average number of common shares
Basic	103,564,654		103,345,064		102,769,444
Diluted	103,904,737		103,877,690		103,242,437
Adjusted EPS
Basic	$	0.35	$	0.17	$	0.16
Diluted	$	0.35	$	0.17	$	0.16

Ero Copper Corp. March 31, 2025 MD&A | Page 28

Net Debt

Net debt is a performance measure used by the Company to assess its financial position and ability to pay down its debt. Net debt is determined based on cash and cash equivalents, short-term investments, net of loans and borrowings as reported in the Company’s condensed consolidated interim financial statements. The following table provides a calculation of net (cash) debt based on amounts presented in the Company’s condensed consolidated interim financial statements as at the periods presented.

	March 31, 2025		December 31, 2024		March 31, 2024
Current portion of loans and borrowings	$	52,479	$	45,893	$	16,059
Long-term portion of loans and borrowings	589,860		556,296		450,743
Less:
Cash and cash equivalents	(80,573)		(50,402)		(51,692)
Net debt (cash)	$	561,766	$	551,787	$	415,110

Working Capital and Available Liquidity

Working capital is calculated as current assets less current liabilities as reported in the Company’s condensed consolidated interim financial statements. The Company uses working capital as a measure of the Company’s short-term financial health and ability to meet its current obligations using its current assets. Available liquidity is calculated as the sum of cash and cash equivalents, short-term investments and the undrawn amount available on its revolving credit facilities. The Company uses this information to evaluate the liquid assets available. The following table provides a calculation for these based on amounts presented in the Company’s condensed consolidated interim financial statements as at the periods presented.

	March 31, 2025		December 31, 2024		March 31, 2024
Current assets	$	232,292	$	141,790	$	129,960
Less: Current liabilities	(222,048)		(211,706)		(158,565)
Working capital (deficit)	$	10,244	$	(69,916)	$	(28,605)
Cash and cash equivalents	80,573		50,402		51,692
Available undrawn revolving credit facilities(1)	35,000		15,000		105,000
Available undrawn prepayment facilities(2)	—		25,000		—
Available liquidity	$	115,573	$	90,402	$	156,692

(1) In January 2025, the Company amended its Senior Credit Facility to increase the limit from $150.0 million to $200.0 million and extended the maturity from December 2026 to December 2028.

(2) In March 2025, the Company exercised its option to increase the size of its copper prepayment facility from $50.0 million to $75.0 million.

Ero Copper Corp. March 31, 2025 MD&A | Page 29

DISCLOSURE CONTROLS AND PROCEDURES AND INTERNAL CONTROL OVER FINANCIAL REPORTING

The Company’s management, with the participation of the CEO and CFO, is responsible for establishing and maintaining adequate disclosure controls and procedures (“DC&P”) and internal control over financial reporting (“ICFR”) using Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission ("COSO") as its internal control framework.

The Company’s DC&P are designed to provide reasonable assurance that material information related to the Company is identified and communicated on a timely basis.

The Company’s ICFR is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with IFRS. Any system of ICFR, no matter how well designed, has inherent limitations and cannot provide absolute assurance that all misstatements and instances of fraud, if any, within the Company have been prevented or detected. The Company’s ICFR is designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with IFRS.

There were no changes in the Company’s DC&P and ICFR that materially affected, or are reasonably likely to materially affect, ICFR during the three months ended March 31, 2025.

NOTE REGARDING SCIENTIFIC AND TECHNICAL INFORMATION

Unless otherwise indicated, scientific and technical information in this MD&A relating to Ero’s properties (“Technical Information”) is based on information contained in the following:

The report prepared in accordance with National Instrument 43-101, Standards of Disclosure for Mineral Projects (“NI 43-101”) and entitled “2022 Mineral Resources and Mineral Reserves of the Caraíba Operations, Curaçá Valley, Bahia, Brazil”, dated December 22, 2022 with an effective date of September 30, 2022, prepared by Porfirio Cabaleiro Rodriguez, FAIG, Bernardo Horta de Cerqueira Viana, FAIG, Fábio Valério Câmara Xavier, MAIG and Ednie Rafael Moreira de Carvalho Fernandes, MAIG all of GE21 Consultoria Mineral Ltda. (“GE21”), Dr. Beck Nader, FAIG of BNA Mining Solutions (“BNA”) and Alejandro Sepulveda, Registered Member (#0293) (Chilean Mining Commission) of NCL Ingeniería y Construcción SpA (“NCL”) (the “Caraíba Operations Technical Report”). Each a “qualified person” and “independent” of the Company within the meanings of NI 43-101.

The report prepared in accordance with NI 43-101 and entitled “Mineral Resource and Mineral Reserve Estimate of the Xavantina Operations, Nova Xavantina”, dated May 12, 2023 with an effective date of October 31, 2022, prepared by Porfirio Cabaleiro Rodriguez, FAIG, Leonardo de Moraes Soares, MAIG and Guilherme Gomides Ferreira, MAIG, all of GE21 (the “Xavantina Operations Technical Report”). Each a “qualified person” and “independent” of the Company within the meanings of NI 43-101.

The report prepared in accordance with NI 43-101 and entitled “Boa Esperança Project NI 43-101 Technical Report on Feasibility Study Update”, dated November 12, 2021 with an effective date of August 31, 2021, prepared by Kevin Murray, P. Eng., Scott C. Elfen, P.E. (each of Ausenco Engineering Canada Inc.), Erin L. Patterson, P.E. (formerly employed by its affiliate Ausenco Engineering USA South Inc. and together with Ausenco Engineering Canada Inc., referred to as “Ausenco”), Carlos

Ero Copper Corp. March 31, 2025 MD&A | Page 30

Guzmán, FAusIMM RM CMC of NCL, and Emerson Ricardo Re, MSc, MBA, MAusIMM (CP) (No. 305892), Registered Member (No. 0138) (Chilean Mining Commission) and Resource Manager of the Company on the date of the report (now of HCM Consultoria Geologica Eireli (“HCM”)) (the “Tucumã Project Technical Report”). Each of Kevin Murray, P. Eng., Erin L. Patterson, P.E., Scott C. Elfen, P.E., Carlos Guzmán, FAusIMM RM CMC and Emerson Ricardo Re, MAusIMM (CP), is a “qualified person” of the Company within the meanings of NI 43-101 or, in the case of Erin L. Patterson, P.E., who is no longer employed by Ausenco, was a "qualified person" of the Company within the meanings of NI 43-101 on the date of the report. Each of Kevin Murray, P. Eng., Erin L. Patterson, P.E., Scott C. Elfen, P.E., and Carlos Guzmán, FAusIMM RM CMC is “independent” of the Company within the meanings of NI 43-101 or, in the case of Erin L. Patterson, P.E., was "independent" of the Company on the date of the report. Emerson Ricardo Re, MAusIMM (CP), as Resource Manager of the Company (on the date of the report and now of HCM), was not “independent” of the Company on the date of the report, within the meaning of NI 43-101.

Reference should be made to the full text of the Caraíba Operations Technical Report, the Xavantina Operations Technical Report and the Tucumã Project Technical Report, each of which is available for review on the Company's website at www.erocopper.com and under the Company’s profile on SEDAR+ at www.sedarplus.ca, and EDGAR at www.sec.gov.

The disclosure of Technical Information in this MD&A has been reviewed and approved by Cid Gonçalves Monteiro Filho, SME RM (04317974), MAIG (No. 8444), FAusIMM (No. 329148) and Resource Manager of the Company who is a “qualified person” within the meanings of NI 43-101.

Cautionary Note Regarding Forward-Looking Statements

This MD&A contains “forward-looking statements” within the meaning of the United States Private Securities Litigation Reform Act of 1995 and “forward-looking information” within the meaning of applicable Canadian securities legislation (collectively, “forward-looking statements”). Forward-looking statements include statements that use forward-looking terminology such as “may”, “could”, “would”, “will”, “should”, “intend”, “target”, “plan”, “expect”, “budget”, “estimate”, “forecast”, “schedule”, “anticipate”, “believe”, “continue”, “potential”, “view” or the negative or grammatical variation thereof or other variations thereof or comparable terminology. Forward-looking statements may include, but are not limited to, statements with respect to the Company’s production, operating cost and capital expenditure guidance; targeting additional mineral resources and expansion of deposits; capital and operating cost estimates and economic analyses (including cash flow projections), including those from the Caraíba Operations Technical Report, the Xavantina Operations Technical Report and the Tucumã Project Technical Report; the Company’s expectations, strategies and plans for the Caraíba Operations, the Xavantina Operations and the Tucumã Operation, including the Company’s planned exploration, development, construction and production activities; the Company's plans for the Furnas Project; the results of future exploration and drilling; estimated completion dates for certain milestones; successfully adding or upgrading mineral resources and successfully developing new deposits; the costs and timing of future exploration, development and construction; the timing and amount of future production at the Caraíba Operations, the Xavantina Operations and the Tucumã Operation; expectations regarding the Company's ability to manage risks related to future copper price fluctuations and volatility; future financial or operating performance and condition of the Company and its business, operations and properties, including expectations regarding liquidity, capital structure, competitive position and payment of dividends; expectations regarding future currency exchange rates; expected concentrate treatment and refining charges; gold by-product credits and USD to BRL exchange rate; and any other statement that may predict, forecast, indicate or imply future plans, intentions, levels of activity, results, performance or achievements.

Ero Copper Corp. March 31, 2025 MD&A | Page 31

Forward-looking statements are subject to a variety of known and unknown risks, uncertainties and other factors that could cause actual results, actions, events, conditions, performance or achievements to materially differ from those expressed or implied by the forward-looking statements, including, without limitation, risks discussed in this MD&A and in the AIF under the heading “Risk Factors”. The risks discussed in this MD&A and in the AIF are not exhaustive of the factors that may affect any of the Company’s forward-looking statements. Although the Company has attempted to identify important factors that could cause actual results, actions, events, conditions, performance or achievements to differ materially from those contained in forward-looking statements, there may be other factors that cause results, actions, events, conditions, performance or achievements to differ from those anticipated, estimated or intended.

Forward-looking statements are not a guarantee of future performance. There can be no assurance that forward-looking statements will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. Forward-looking statements involve statements about the future and are inherently uncertain, and the Company’s actual results, achievements or other future events or conditions may differ materially from those reflected in the forward-looking statements due to a variety of risks, uncertainties and other factors, including, without limitation, those referred to herein and in the AIF under the heading “Risk Factors”.

The Company’s forward-looking statements are based on the assumptions, beliefs, expectations and opinions of management on the date the statements are made, many of which may be difficult to predict and beyond the Company’s control. In connection with the forward-looking statements contained in this MD&A and in the AIF, the Company has made certain assumptions about, among other things: favourable equity and debt capital markets; the ability to raise any necessary additional capital on reasonable terms to advance the production, development and exploration of the Company’s properties and assets; future prices of copper, gold and other metal prices; the timing and results of exploration and drilling programs; the accuracy of any mineral reserve and mineral resource estimates; the geology of the Caraíba Operations, the Xavantina Operations and the Tucumã Operation being as described in the respective technical report for each property; production costs; the accuracy of budgeted exploration, development and construction costs and expenditures; the price of other commodities such as fuel; future currency exchange rates, interest rates and tariff rates; operating conditions being favourable such that the Company is able to operate in a safe, efficient and effective manner; work force continuing to remain healthy in the face of prevailing epidemics, pandemics or other health risks, political and regulatory stability; the receipt of governmental, regulatory and third party approvals, licenses and permits on favourable terms; obtaining required renewals for existing approvals, licenses and permits on favourable terms; requirements under applicable laws; sustained labour stability; stability in financial and capital goods markets; availability of equipment; positive relations with local groups and the Company’s ability to meet its obligations under its agreements with such groups; and satisfying the terms and conditions of the Company’s current loan arrangements. Although the Company believes that the assumptions inherent in forward-looking statements are reasonable as of the date of this MD&A, these assumptions are subject to significant business, social, economic, political, regulatory, competitive and other risks and uncertainties, contingencies and other factors that could cause actual actions, events, conditions, results, performance or achievements to be materially different from those projected in the forward-looking statements. The Company cautions that the foregoing list of assumptions is not exhaustive. Other events or circumstances could cause actual results to differ materially from those estimated or projected and expressed in, or implied by, the forward-looking statements contained in this MD&A.

Forward-looking statements contained herein are made as of the date of this MD&A and the Company disclaims any obligation to update or revise any forward-looking statement, whether as a result of

Ero Copper Corp. March 31, 2025 MD&A | Page 32

new information, future events or results or otherwise, except as and to the extent required by applicable securities laws.

Cautionary Notes Regarding Mineral Resource and Reserve Estimates

Unless otherwise indicated, all reserve and resource estimates included in this MD&A and the documents incorporated by reference herein have been prepared in accordance with Canadian NI 43-101 and the Canadian Institute of Mining, Metallurgy and Petroleum (the “CIM”) — CIM Definition Standards on Mineral Resources and Mineral Reserves, adopted by the CIM Council, as amended (the “CIM Standards”). NI 43-101 is a rule developed by the Canadian Securities Administrators that establishes standards for all public disclosure an issuer makes of scientific and technical information concerning mineral projects. Canadian standards, including NI 43-101, differ significantly from the requirements of the United States Securities and Exchange Commission (the “SEC”), and reserve and resource information included herein may not be comparable to similar information disclosed by U.S. companies. In particular, and without limiting the generality of the foregoing, this MD&A and the documents incorporated by reference herein use the terms “measured resources,” “indicated resources” and “inferred resources” as defined in accordance with NI 43-101 and the CIM Standards.

Further to recent amendments, mineral property disclosure requirements in the United States (the “U.S. Rules”) are governed by subpart 1300 of Regulation S-K of the U.S. Securities Act of 1933, as amended (the “U.S. Securities Act”) which differ from the CIM Standards. As a foreign private issuer that is eligible to file reports with the SEC pursuant to the multi-jurisdictional disclosure system (the “MJDS”), Ero is not required to provide disclosure on its mineral properties under the U.S. Rules and will continue to provide disclosure under NI 43-101 and the CIM Standards. If Ero ceases to be a foreign private issuer or loses its eligibility to file its annual report on Form 40-F pursuant to the MJDS, then Ero will be subject to the U.S. Rules, which differ from the requirements of NI 43-101 and the CIM Standards.

Pursuant to the new U.S. Rules, the SEC recognizes estimates of “measured mineral resources”, “indicated mineral resources” and “inferred mineral resources.” In addition, the definitions of “proven mineral reserves” and “probable mineral reserves” under the U.S. Rules are now “substantially similar” to the corresponding standards under NI 43-101. Mineralization described using these terms has a greater amount of uncertainty as to its existence and feasibility than mineralization that has been characterized as reserves. Accordingly, U.S. investors are cautioned not to assume that any measured mineral resources, indicated mineral resources, or inferred mineral resources that Ero reports are or will be economically or legally mineable. Further, “inferred mineral resources” have a greater amount of uncertainty as to their existence and as to whether they can be mined legally or economically. Under Canadian securities laws, estimates of “inferred mineral resources” may not form the basis of feasibility or pre-feasibility studies, except in rare cases. While the above terms under the U.S. Rules are “substantially similar” to the standards under NI 43-101 and CIM Standards, there are differences in the definitions under the U.S. Rules and CIM Standards. Accordingly, there is no assurance any mineral reserves or mineral resources that Ero may report as “proven mineral reserves”, “probable mineral reserves”, “measured mineral resources”, “indicated mineral resources” and “inferred mineral resources” under NI 43-101 would be the same had Ero prepared the reserve or resource estimates under the standards adopted under the U.S. Rules.

Ero Copper Corp. March 31, 2025 MD&A | Page 33

ADDITIONAL INFORMATION

Additional information about Ero and its business activities, including the AIF, is available under the Company’s profile at www.sedarplus.ca and www.sec.gov.

Ero Copper Corp. March 31, 2025 MD&A | Page 34

Document

CONDENSED CONSOLIDATED INTERIM

FINANCIAL STATEMENTS

FOR THE THREE MONTHS ENDED

MARCH 31, 2025 AND 2024

Ero Copper Corp.
Table of Contents
CONSOLIDATED FINANCIAL STATEMENTS
---	---
Condensed Consolidated Statements of Financial Position	1
Condensed Consolidated Statements of Operations and Comprehensive Income (Loss)	2
Condensed Consolidated Statements of Cash Flow	3
Condensed Consolidated Statements of Changes in Shareholders' Equity	4
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
General
Note 1. Nature of Operations	5
Note 2. Basis of Preparation	5
Note 3. Segment Disclosure	6
Statements of Financial Position
Note 4. Inventories	8
Note 5. Other Current Assets	8
Note 6. Mineral Properties, Plant and Equipment	9
Note 7. Exploration and Evaluation Assets	10
Note 8. Deposits and Other Non-current Assets	10
Note 9. Accounts Payable and Accrued Liabilities	11
Note 10. Loans and Borrowings	11
Note 11. Deferred Revenue	14
Note 12. Other Non-current Liabilities	15
Note 13. Share Capital	15
Statements of Earnings
Note 14. Revenue	19
Note 15. Cost of Sales	19
Note 16. General and Administrative Expenses	20
Note 17. Finance Expense	20
Note 18. Foreign Exchange Gain (Loss)	21
Other Items
Note 19. Financial Instruments	21
Note 20. Supplemental Cash Flow Information	25
Ero Copper Corp.
---
Condensed Consolidated Statements of Financial Position
(Unaudited, Amounts in thousands of US Dollars)
	Notes	March 31, 2025		December 31, 2024
---	---	---	---	---	---
ASSETS
Current
Cash and cash equivalents		$	80,573	$	50,402
Trade receivable		63,606		18,399
Inventories	4	55,535		42,094
Income tax receivable		1,526		2,284
Other current assets	5	31,052		28,611
		232,292		141,790
Non-Current
Mineral properties, plant and equipment	6	1,401,584		1,258,494
Exploration and evaluation assets	7	15,320		11,352
Deferred income tax assets		5,817		16,659
Deposits and other non-current assets	8	30,683		29,733
		1,453,404		1,316,238
Total Assets		$	1,685,696	$	1,458,028
LIABILITIES
Current
Accounts payable and accrued liabilities	9	$	136,022	$	101,886
Current portion of loans and borrowings	10	52,479		45,893
Current portion of deferred revenue	11	13,911		31,712
Income taxes payable		1,932		3,330
Current portion of derivatives	19	3,748		17,980
Current portion of lease liabilities		13,956		10,905
		222,048		211,706
Non-Current
Loans and borrowings	10	589,860		556,296
Deferred revenue	11	97,411		48,231
Provision for rehabilitation and closure costs		23,706		21,891
Lease liabilities		8,433		6,980
Other non-current liabilities	12	25,558		21,850
		744,968		655,248
Total Liabilities		967,016		866,954
SHAREHOLDERS’ EQUITY
Share capital	13	286,874		286,548
Equity reserves		(134,266)		(180,472)
Retained earnings		561,282		481,055
Equity attributable to owners of the Company		713,890		587,131
Non-controlling interests		4,790		3,943
		718,680		591,074
Total Liabilities and Equity		$	1,685,696	$	1,458,028
Commitments (Notes 7 and 11)
---	---	---	---	---
APPROVED ON BEHALF OF THE BOARD:
	"Makko DeFilippo"	, President, CEO and Director	"Jill Angevine"	, Director

The accompanying notes are an integral part of these condensed consolidated interim financial statements Page 1

Ero Copper Corp.
Condensed Consolidated Statements of Operations and Comprehensive Income (Loss)
(Unaudited, Amounts in thousands of US Dollars, except share and per share amounts)				Three months ended March 31,
---	---	---	---	---
	Notes		2025		2024
Revenue	14		$	125,088	$	105,793
Cost of sales	15		(69,566)		(74,616)
Gross profit			55,522		31,177
Expenses
General and administrative	16		(11,371)		(11,514)
Share-based compensation	13 (e)		(1,173)		(6,545)
Operating Income			42,978		13,118
Finance income			838		1,468
Finance expense	17		(4,723)		(4,634)
Foreign exchange gain (loss)	18		58,400		(18,996)
Other (expenses) income			(2,125)		361
Income (loss) before income taxes			95,368		(8,683)
Current income tax expense			(3,718)		(3,330)
Deferred income tax (expense) recovery			(11,023)		5,183
Income tax (expense) recovery			(14,741)		1,853
Net income (loss) for the period			$	80,627	$	(6,830)
Other comprehensive gain (loss)
Foreign currency translation gain (loss)			45,775		(24,680)
Comprehensive income (loss)			$	126,402	$	(31,510)
Net income (loss) attributable to:
Owners of the Company			80,227		(7,141)
Non-controlling interests			400		311
			$	80,627	$	(6,830)
Comprehensive income (loss) attributable to:
Owners of the Company			125,555		(31,621)
Non-controlling interests			847		111
			$	126,402	$	(31,510)
Net income (loss) per share attributable to owners of the Company
Basic	13 (f)		$	0.77	$	(0.07)
Diluted	13 (f)		$	0.77	$	(0.07)
Weighted average number of common shares outstanding
Basic	13 (f)		103,564,654		102,769,444
Diluted	13 (f)		103,904,737		102,769,444

The accompanying notes are an integral part of these condensed consolidated interim financial statements Page 2

Ero Copper Corp.
Condensed Consolidated Statements of Cash Flow
(Unaudited, Amounts in thousands of US Dollars)
		Three months ended March 31,
---	---	---	---	---
	Notes		2025		2024
Cash Flows from Operating Activities
Net income (loss) for the period			$	80,627	$	(6,830)
Adjustments for:
Amortization and depreciation			18,620		23,296
Income tax expense (recovery)			14,741		(1,853)
Amortization of deferred revenue	14		(2,246)		(5,923)
Share-based compensation	13 (e)		1,173		6,545
Finance income			(838)		(1,468)
Finance expenses	17		4,723		4,634
Foreign exchange (gain) loss			(57,464)		19,498
Other			2,192		(9)
Changes in non-cash working capital items	20		(42,766)		(20,574)
			18,762		17,316
Advance from Xavantina Gold Stream	11		50,000		1,105
Derivative contract settlements			(2,216)		2,126
Provision settlements			(742)		(688)
Income taxes paid			(364)		(2,627)
			65,440		17,232
Cash Flows used in Investing Activities
Additions to mineral properties, plant and equipment			(56,430)		(106,589)
Additions to exploration and evaluation assets			(3,109)		(1,201)
Proceeds from short-term investments and interest received			517		731
			(59,022)		(107,059)
Cash Flows used in Financing Activities
Lease liability payments			(4,003)		(3,110)
New loans and borrowings, net of transaction costs	10		55,266		50,135
Loans and borrowings repaid	10		(9,502)		(2,617)
Interest paid on loans and borrowings	10		(16,927)		(13,352)
Other finance expenses paid			(2,050)		(1,286)
Proceeds from exercise of stock options			207		298
			22,991		30,068
Effect of exchange rate changes on cash and cash equivalents			762		(287)
Net increase (decrease) in cash and cash equivalents			30,171		(60,046)
Cash and cash equivalents - beginning of period			50,402		111,738
Cash and cash equivalents - end of period			$	80,573	$	51,692

Supplemental cash flow information (note 20)

The accompanying notes are an integral part of these condensed consolidated interim financial statements Page 3

Ero Copper Corp.
Condensed Consolidated Statements of Changes in Shareholders' Equity
(Unaudited, Amounts in thousands of US Dollars, except share and per share amounts)
		Share Capital			Equity Reserves
---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---
	Notes	Number of<br>shares	Amount		Contributed <br>Surplus		Foreign<br>Exchange		Retained<br>Earnings		Total		Non-controlling<br>interest		Total equity
Balance, December 31, 2023		102,747,558	$	271,336	$	8,497	$	(25,113)	$	549,530	$	804,250	$	5,081	$	809,331
Income (loss) for the period		—	—		—		—		(7,141)		(7,141)		311		(6,830)
Other comprehensive loss for the period		—	—		—		(24,480)		—		(24,480)		(200)		(24,680)
Total comprehensive income (loss) for the period		—	—		—		(24,480)		(7,141)		(31,621)		111		(31,510)
Shares issued for:
Exercise of options		21,886	423		(125)		—		—		298		—		298
Share-based compensation	13 (e)	—	—		1,354		—		—		1,354		—		1,354
Dividends to non-controlling interest		—	—		—		—		—		—		(50)		(50)
Balance, March 31, 2024		102,769,444	$	271,759	$	9,726	$	(49,593)	$	542,389	$	774,281	$	5,142	$	779,423
Balance, December 31, 2024		103,555,211	$	286,548	$	8,181	$	(188,653)	$	481,055	$	587,131	$	3,943	$	591,074
Income for the period		—	—		—		—		80,227		80,227		400		80,627
Other comprehensive income for the period		—	—		—		45,328		—		45,328		447		45,775
Total comprehensive income for the period		—	—		—		45,328		80,227		125,555		847		126,402
Shares issued for:
Exercise of options		16,296	316		(109)		—		—		207		—		207
Settlement of restricted share units		559	10		(22)		—		—		(12)		—		(12)
Share-based compensation	13 (e)	—	—		1,009		—		—		1,009		—		1,009
Balance, March 31, 2025		103,572,066	$	286,874	$	9,059	$	(143,325)	$	561,282	$	713,890	$	4,790	$	718,680

The accompanying notes are an integral part of these condensed consolidated interim financial statements Page 4

Ero Copper Corp.
Condensed Consolidated Statements of Changes in Shareholders' Equity
(Unaudited, Amounts in thousands of US Dollars, except share and per share amounts)

1. Nature of Operations

Ero Copper Corp. (“Ero" or the "Company") was incorporated on May 16, 2016 under the Business Corporations Act (British Columbia) and maintains its head office at Suite 1050, 625 Howe Street, Vancouver, British Columbia, Canada, V6C 2T6. The Company’s shares are publicly traded on the Toronto Stock Exchange and the New York Stock Exchange under the symbol “ERO”.

The Company’s primary asset is its 99.6% ownership interest in Mineração Caraíba S.A. (“MCSA”), held indirectly through its wholly-owned subsidiary, Ero Brasil Participaçoes Ltda. The Company also currently owns a 97.6% ownership interest in NX Gold S.A. (“NX Gold”) indirectly through its wholly-owned subsidiary, Ero Gold Corp. (“Ero Gold”).

MCSA is a Brazilian copper company which holds a 100% interest in the Caraíba Operations, located in the State of Bahia, and the Tucumã Operation, located in the southeastern part of the State of Pará. MCSA’s predominant activity is the production and sale of copper concentrates, with gold and silver produced and sold as by-products.

NX Gold is a Brazilian gold mining company which holds a 100% interest in the Xavantina Operations and is focused on the production and sale of gold as its main product and silver as its by-product. The Xavantina Operations are located approximately 18 kilometers west of the town of Nova Xavantina, in southeastern State of Mato Grosso, Brazil.

2. Basis of Preparation

(a) Statement of Compliance

These condensed consolidated interim financial statements have been prepared in accordance with International Accounting Standards (“IAS”) 34, Interim Financial Reporting and follow the same accounting policies and methods of application as the Company’s most recent annual consolidated financial statements for the year ended December 31, 2024.

These condensed consolidated interim financial statements do not include all of the information required for full consolidated annual financial statements and should be read in conjunction with the consolidated financial statements of the Company as at and for the year ended December 31, 2024, prepared in accordance with International Financial Reporting Standards (“IFRS”) as issued by the International Accounting Standards Board (“IASB”).

These condensed consolidated interim financial statements were authorized for issue by the Board of Directors of the Company (the “Board”) on May 5, 2025.

(b) Use of Estimates and Judgments

In preparing these condensed consolidated interim financial statements, management has made judgments, estimates and assumptions that affect the application of the Company’s accounting policies and the reported amounts of assets, liabilities, income and expense. Actual results may differ. Significant judgments made by management in applying the Company’s accounting policies and key sources of estimation uncertainty were the same as those applied in the most recent annual audited consolidated financial statements for the year ended December 31, 2024.

Notes to Financial Statements | Page 5

Ero Copper Corp.
Notes to Condensed Consolidated Interim Financial Statements
(Unaudited, Tabular amounts in thousands of US Dollars, except share and per share amounts)

3. Segment Disclosure

Operating segments are determined by the way information is reported and used by the Company's Chief Operating Decision Maker ("CODM") to review operating performance. The Company monitors the operating results of its operating segments independently for the purpose of making decisions about resource allocation and performance assessment.

For the three months ended March 31, 2025, the Company’s reporting segments include its three operating mines in Brazil, the Caraíba Operations, the Tucumã Operation, and the Xavantina Operations, and its corporate head office in Canada. Significant information relating to the Company's reportable segments is summarized in the tables below:

Three months ended March 31, 2025	Caraíba <br>(Brazil)		Tucumã<br><br>(Brazil)		Xavantina<br>(Brazil)		Corporate and Other		Consolidated
Revenue	$	63,270	$	46,232	$	15,586	$	—	$	125,088
Cost of production	(35,719)		(5,522)		(6,225)		—		(47,466)
Depreciation and depletion	(14,646)		(45)		(3,555)		—		(18,246)
Sales expense	(1,376)		(2,203)		(275)		—		(3,854)
Cost of sales	(51,741)		(7,770)		(10,055)		—		(69,566)
Gross profit	11,529		38,462		5,531		—		55,522
Expenses
General and administrative	(4,622)		(1,423)		(1,687)		(3,639)		(11,371)
Share-based compensation	—		—		—		(1,173)		(1,173)
Operating income (loss)	$	6,907	$	37,039	$	3,844	$	(4,812)	$	42,978
Capital expenditures(1)	34,404		15,452		4,818		2,927		57,601
Assets
Current	$	69,500	$	90,080	$	66,547	$	6,165	232,292
Non-current	893,825		450,363		93,496		15,720		1,453,404
Total Assets	$	963,325	$	540,443	$	160,043	$	21,885	$	1,685,696
Total Liabilities	$	171,637	$	64,136	$	134,277	$	596,966	967,016

(1) Capital expenditures include additions to mineral properties, plant and equipment and additions to exploration and evaluation asset, net of non-cash additions such as change in estimates to mine closure costs, capitalized depreciation expense, capitalized borrowing costs, and additions of right-of-use assets.

During the three months ended March 31, 2025, the Company had five significant customers (March 31, 2024 - three), including three copper customer (March 31, 2024 - one) and two gold customers (March 31, 2024 - two).

Notes to Financial Statements | Page 6

Ero Copper Corp.
Notes to Condensed Consolidated Interim Financial Statements
(Unaudited, Tabular amounts in thousands of US Dollars, except share and per share amounts)
Three months ended March 31, 2024	Caraíba <br>(Brazil)		Tucumã (Brazil)		Xavantina<br>(Brazil)		Corporate and Other		Consolidated
---	---	---	---	---	---	---	---	---	---	---
Revenue	$	73,856	$	—	$	31,937	$	—	$	105,793
Cost of production	(42,227)		—		(7,255)		—		(49,482)
Depreciation and depletion	(17,561)		—		(5,283)		—		(22,844)
Sales expense	(1,818)		—		(472)		—		(2,290)
Cost of sales	(61,606)		—		(13,010)		—		(74,616)
Gross profit	12,250		—		18,927		—		31,177
Expenses
General and administrative	(6,354)		—		(1,601)		(3,559)		(11,514)
Share-based compensation	—		—		—		(6,545)		(6,545)
Operating income (loss)	$	5,896	$	—	$	17,326	$	(10,104)	$	13,118
Capital expenditures(1)	41,604		50,039		4,406		1,124		97,173
Assets
Current	$	76,717	$	4,956	$	21,654	$	26,633	129,960
Non-current	887,555		372,997		92,727		17,296		1,370,575
Total Assets	$	964,272	$	377,953	$	114,381	$	43,929	$	1,500,535
Total Liabilities	$	120,940	$	34,502	$	90,991	$	474,679	721,112

Notes to Financial Statements | Page 7

Ero Copper Corp.
Notes to Condensed Consolidated Interim Financial Statements
(Unaudited, Tabular amounts in thousands of US Dollars, except share and per share amounts)

4. Inventories

	March 31, 2025		December 31, 2024
Supplies and consumables	$	33,889	$	28,980
Stockpiles	6,610		5,024
Work in progress	4,334		3,049
Finished goods	10,702		5,041
	$	55,535	$	42,094

5. Other Current Assets

	March 31, 2025		December 31, 2024
Advances to suppliers	$	3,176	$	3,157
Prepaid expenses and other	9,612		5,879
Derivatives (Note 19)	271		—
Note receivable (Note 19)	4,520		4,678
Value added taxes recoverable	13,473		14,897
	$	31,052	$	28,611

Notes to Financial Statements | Page 8

Ero Copper Corp.
Notes to Condensed Consolidated Interim Financial Statements
(Unaudited, Tabular amounts in thousands of US Dollars, except share and per share amounts)

6. Mineral Properties, Plant and Equipment

	Buildings		Mining Equipment		Mineral<br><br>Properties(1)		Projects in <br>Progress		Equipment & Other Assets		Deposit on Projects		Mine Closure Costs		Right-of-Use Assets		Total
Cost:
Balance, December 31, 2024	36,593		294,944		643,758		501,057		26,972		12,700		21,336		49,995		1,587,355
Additions	99		2,858		21,965		27,274		493		1,897		—		7,175		61,761
Capitalized borrowing costs	—		—		—		11,017		—		—		—		—		11,017
Disposals	—		(20)		—		—		—		—		—		(180)		(200)
Transfers	—		811		37		1,796		7		(2,651)		—		—		—
Foreign exchange	2,857		23,075		50,167		32,420		1,980		965		1,664		3,909		117,037
Balance, March 31, 2025	$	39,549	$	321,668	$	715,927	$	573,564	$	29,452	$	12,911	$	23,000	$	60,899	$	1,776,970
Accumulated depreciation:
Balance, December 31, 2024	(7,219)		(73,675)		(199,911)		—		(9,210)		—		(5,574)		(33,272)		(328,861)
Depreciation expense	(635)		(6,525)		(8,749)		—		(521)		—		(221)		(4,191)		(20,842)
Disposals	—		20		—		—		—		—		—		126		146
Foreign exchange	(574)		(5,862)		(15,695)		—		(646)		—		(439)		(2,613)		(25,829)
Balance, March 31, 2025	$	(8,428)	$	(86,042)	$	(224,355)	$	—	$	(10,377)	$	—	$	(6,234)	$	(39,950)	$	(375,386)
Net book value, December 31, 2024	$	29,374	$	221,269	$	443,847	$	501,057	$	17,762	$	12,700	$	15,762	$	16,723	$	1,258,494
Net book value, March 31, 2025	$	31,121	$	235,626	$	491,572	$	573,564	$	19,075	$	12,911	$	16,766	$	20,949	$	1,401,584

(1) Mineral properties include $65.7 million (2024 - $57.9 million) of costs on expansion of near-mine resource potential which are not currently being depreciated.

Notes to Financial Statements | Page 9

Ero Copper Corp.
Notes to Condensed Consolidated Interim Financial Statements
(Unaudited, Tabular amounts in thousands of US Dollars, except share and per share amounts)

7. Exploration and Evaluation Assets

As at March 31, 2025, the Company had $15.3 million (2024 - $11.4 million) in exploration and evaluation assets, which include several property option agreements.

In July 2024, the Company signed a definitive earn-in agreement (the "Agreement") with Salobo Metais S.A, a subsidiary of Vale Base Metals ("VBM"), for the Furnas copper project ("Furnas Project") located in the Carajás Mineral Province in Pará State, Brazil. The Agreement contemplates the Company earning a 60% interest in the Project upon completion of three phases of work:

•Phase 1: Ero to conduct a minimum of 28,000 meters of exploration drilling and produce a scoping study within 18 months of signing the Agreement

•Phase 2: Ero to conduct an additional minimum of 17,000 meters of exploration drilling and produce a pre-feasibility study within 18 months of completing Phase 1

•Phase 3: Ero to conduct an additional minimum of 45,000 meters of exploration drilling, unless otherwise mutually agreed, and produce a definitive feasibility study ("DFS") within 24 months of completing Phase 2

Following the completion of a DFS, subject to customary technical review periods, and with Ero positive investment approval, the parties will enter into a joint venture agreement whereby VBM will transfer 60% of the equity interest in the Furnas Project to Ero, and Ero will grant VBM a "free carry" on certain capital expenditures related to development of the Furnas Project.

Prior to a positive Ero investment decision and the formation of a joint venture, VBM will retain 100% ownership of the Furnas Project with Ero solely responsible for funding the phased exploration and engineering work programs as well as ongoing payments to maintain the property in good standing.

As at March 31, 2025, exploration and evaluation assets include $8.0 million (2024 - $4.9 million) in expenditures associated with the Furnas Project.

Deposits and Other Non-current Assets

	March 31, 2025		December 31, 2024
Value added taxes recoverable	$	19,137	$	18,336
Note receivable (Note 19)	7,463		7,331
Deposits and others	4,083		4,066
	$	30,683	$	29,733

Notes to Financial Statements | Page 10

Ero Copper Corp.
Notes to Condensed Consolidated Interim Financial Statements
(Unaudited, Tabular amounts in thousands of US Dollars, except share and per share amounts)

9. Accounts Payable and Accrued Liabilities

	March 31, 2025		December 31, 2024
Trade suppliers	$	53,709	$	58,067
Payroll and labour related liabilities	15,069		19,086
Value added tax, royalty and other tax payable	8,350		8,505
Cash-settled equity awards (Note 13(b) and (c))	7,917		8,460
Customer advance	42,615		—
Provision for rehabilitation and closure costs	7,285		6,766
Other accrued liabilities	1,077		1,002
	$	136,022	$	101,886

10. Loans and Borrowings

							Carrying value, <br>including accrued interest
Description	Currency	Security	Maturity<br>(Months)	Coupon rate	Principal to be repaid		March 31, <br>2025		December 31,<br>2024
Senior Notes	USD	Unsecured	58	6.50%	$	400,000	$	397,883	$	404,152
Senior credit facility	USD	Secured	45	SOFR plus<br><br>2.00% - 4.50%	165,000		164,356		134,212
Copper Prepayment Facility	USD	Secured	21	8.66%	63,889		66,254		46,530
Equipment finance loans	USD	Secured	9 - 25	5.00% - 8.35%	10,634		10,755		12,933
Equipment finance loans	EUR	Secured	11 - 15	5.25%	461		462		544
Equipment finance loans	BRL	Unsecured	1 - 14	nil% - 16.63%	1,424		1,484		2,597
Bank loan	BRL	Unsecured	20	CDI + 0.50%	1,139		1,145		1,221
Total					$	642,547	$	642,339	$	602,189
Current portion							$	52,479	$	45,893
Non-current portion							$	589,860	$	556,296

Notes to Financial Statements | Page 11

Ero Copper Corp.
Notes to Condensed Consolidated Interim Financial Statements
(Unaudited, Tabular amounts in thousands of US Dollars, except share and per share amounts)

The movements in loans and borrowings are comprised of the following:

	Three months ended March 31, 2025										Year ended<br><br>December 31,<br><br>2024
	Senior Notes		Senior Credit Facility		Copper Prepayment Facility		Other		Consolidated		Consolidated
Balance, beginning of period	$	404,152	$	134,212	$	46,530	$	17,295	$	602,189	$	426,233
Proceeds from loans and borrowings			30,000		25,000		266		55,266		214,565
Principal payments	—		—		(5,556)		(3,946)		(9,502)		(39,950)
Interest payments	(13,000)		(2,821)		(809)		(297)		(16,927)		(32,166)
Interest costs, including interest capitalized	6,731		2,965		1,089		232		11,017		36,467
Deferred transaction costs	—		—		—		—		—		(2,143)
Foreign exchange	—		—		—		296		296		(817)
Balance, end of period	$	397,883	$	164,356	$	66,254	$	13,846	$	642,339	$	602,189

(a) Senior Notes

In February 2022, the Company issued $400 million aggregate principal amount of senior unsecured notes (the “Senior Notes”). The Company received net proceeds of $392.0 million after transaction costs of $8.0 million. The Senior Notes mature on February 15, 2030 and bear annual interest at 6.5%, payable semi-annually in February and August of each year.

MCSA has provided a guarantee of the Senior Notes on a senior unsecured basis. The Senior Notes are direct, senior obligations of the Company and MCSA, and are not secured by any mortgage, pledge or charge.

The Company has the option to redeem, in whole or in part, the Senior Notes at a price ranging from 103.25% to 100% of the principal amount together with accrued and unpaid interest, if any, to the date of redemption, with the rate decreasing based on the length of time the Senior Notes are outstanding.

Upon the occurrence of specific kinds of changes of control triggering events, each holder of the Senior Notes will have the right to cause the Company to repurchase some or all of its Senior Notes at 101% of their principal amount, plus accrued and unpaid interest to, but not including, the repurchase date.

The Senior Notes are recognized as financial liabilities, net of unamortized transaction costs, and measured at amortized cost using an effective interest rate of 6.7%.

Notes to Financial Statements | Page 12

Ero Copper Corp.
Notes to Condensed Consolidated Interim Financial Statements
(Unaudited, Tabular amounts in thousands of US Dollars, except share and per share amounts)

(b) Senior Credit Facility

In January 2025, the Company amended its Senior Revolving Credit Facility ("Amended Senior Credit Facility") to increase its borrowing limit from $150.0 million to $200.0 million and to extend the maturity from December 2026 to December 2028. The interest rates on the Amended Senior Credit Facility were reduced to sliding scales of SOFR plus 2.00% to 4.25% depending on the Company’s consolidated total leverage ratio. The Commitment fees for any undrawn portion of the Senior Credit Facility were reduced to between 0.45% to 0.96% based on a sliding scale. The Company determined that the amendments were a non-substantial modification. As at March 31, 2025, the Senior Credit Facility bears an weighted average interest rate of 7.67% on its drawn balance and a commitment fee of 0.73% on its undrawn balance.

The Senior Credit Facility is secured by the shares of MCSA, NX Gold and Ero Gold. The Company is required to comply with certain financial covenants, which are required to be tested at each quarter end. These covenants include (a) a total leverage ratio based on total indebtedness to rolling four quarters adjusted earnings before interest, taxes, depreciation and amortization ("Rolling EBITDA"); (b) a total leverage ratio based on senior indebtedness to Rolling EBITDA; and (c) an interest coverage ratio based on Rolling EBITDA. The Senior Credit Facility provides for negative covenants customary for this type of facilities and permits additional equipment debt and finance leases of up to $50.0 million. As at March 31, 2025, the Company is in compliance with these financial covenants.

In May 2024, the Company entered into a non-priced copper prepayment facility with a bank syndicate. Under this facility, the Company received net proceeds of $49.6 million, representing gross proceeds of $50.0 million less transaction costs of $0.4 million. The Company had the option to increase the size of the non-priced copper prepayment facility from $50.0 million to $75.0 million until March 31, 2025.

In exchange, the Company is obligated to repay the $50.0 million facility over 27 equal monthly installments, beginning in October 2024, through the delivery of a minimum of 272 tonnes of copper each month. The copper to be delivered by the Company will be in the form of LME Copper Warrants. Each monthly delivery's value will be determined based on prevailing market copper prices at the time of delivery. Should the value of any delivery exceed the amount of the monthly installment payment of $2.1 million, the excess value will be repaid to the Company.

As the contractual obligation of the facility will be settled in the form of financial assets, the facility is accounted for as a financial liability measured at amortized cost using the effective interest rate method. Transaction costs are included in the initial measurement of the liability and amortized over the term of the facility.

The facility is secured by the shares of MCSA, NX Gold and Ero Gold.

Notes to Financial Statements | Page 13

Ero Copper Corp.
Notes to Condensed Consolidated Interim Financial Statements
(Unaudited, Tabular amounts in thousands of US Dollars, except share and per share amounts)

Deferred Revenue

Xavantina Gold Stream

In 2021, the Company entered into a precious metals purchase agreement (the “Original Xavantina Stream”) with RGLD Gold AG ("Royal Gold"), a wholly-owned subsidiary of Royal Gold, Inc., in relation to gold production from the Xavantina Operations. The Company received upfront cash consideration of $100.0 million for the purchase of 25% of an equivalent amount of gold to be produced from the Xavantina mine until 93,000 ounces of gold have been delivered and thereafter decreasing to 10% of gold produced over the remaining life of the mine. The contract will be settled by the Company delivering gold to Royal Gold. Royal Gold will make ongoing payments equal to 20% of the then prevailing spot gold price for each ounce of gold delivered until 49,000 ounces of gold have been delivered and 40% of the prevailing spot gold price for each ounce of gold delivered thereafter. Additional advances may be made by Royal Gold based on the Company achieving certain milestones as set out in the Original Xavantina Stream.

On March 28, 2025, the Company extended the terms of the Original Xavantina Stream with Royal Gold to expand the area of influence from which production is subjected to the arrangement to include additional tenements acquired by the Company since the Original Xavantina Stream was completed, and extend the gold delivery threshold milestones from 93,000 ounces of gold to 160,000 ounces of gold, before decreasing to 10% of gold produced over the remaining life of the mine. In exchange, the Company received additional upfront cash consideration of $50.0 million. The contract modification was accounted for as if the original contract was terminated and a new contract created. The remaining consideration received under the Original Xavantina Stream and the additional consideration received as a result of the modification will be allocated to future remaining gold deliveries based on stand alone selling prices on the contract modification date.

The movements in Xavantina Gold Stream deferred revenue during the three months ended March 31, 2025 are comprised of the following:

	March 31, 2025		December 31,<br>2024
Gold ounces delivered in the period(1)	1,367		15,917
Balance, beginning of period	$	62,989	$	75,549
Advances	50,000		3,249
Accretion expense	579		2,501
Amortization of deferred revenue	(2,246)		(18,310)
Balance, end of period	$	111,322	$	62,989
Current portion	$	13,911	$	14,758
Non-current portion	97,411		48,231

(1) During the three months ended March 31, 2025, the Company delivered 1,367 ounces of gold (December 31, 2024 - 15,917 ounces) to Royal Gold for average consideration of $570 per ounce (December 31, 2024 - $473 per ounce). At March 31, 2025, a cumulative 46,544 ounces (December 31, 2024 - 45,177 ounces) of gold have been delivered under the Xavantina Gold Stream.

(2) Amortization of deferred revenue during the three months ended March 31, 2025 was net of $0.5 million (December 31, 2024 - $4.2 million) related to change in estimate attributed to advances received and change in life-of-mine production estimates.

As part of the Xavantina Gold Stream, the Company pledged its equity interest in Ero Gold and NX Gold to Royal Gold as collateral and provided unsecured limited recourse guarantees from Ero and NX Gold.

Notes to Financial Statements | Page 14

Ero Copper Corp.
Notes to Condensed Consolidated Interim Financial Statements
(Unaudited, Tabular amounts in thousands of US Dollars, except share and per share amounts)

Other Non-current Liabilities

	March 31, 2025		December 31, 2024
Cash-settled equity awards (Note 13(b))	$	3,251	$	2,536
Withholding, value added tax, and other taxes payable	16,301		14,437
Provision	1,689		1,588
Derivatives (Note 19)	578		—
Other liabilities	3,739		3,289
	$	25,558	$	21,850

Share Capital

(a) Options

A continuity of the issued and outstanding options is as follows:

	Three Months Ended March 31,
	2025			2024
	Number of <br>Stock Options	Weighted Average Exercise Price (CAD)		Number of <br>Stock Options	Weighted Average Exercise Price (CAD)
Outstanding stock options, beginning of period	1,734,607	$	19.07	1,886,325	$	19.03
Exercised	(16,296)	18.12		(21,886)	18.44
Forfeited	(59,256)	20.38		—	—
Outstanding stock options, end of period	1,659,055	$	19.03	1,864,439	$	19.03

The weighted average share price on the date of exercise for options exercised during the three months ended March 31, 2025 was CAD$19.64 (three months ended March 31, 2024 - CAD$23.43).

Notes to Financial Statements | Page 15

Ero Copper Corp.
Notes to Condensed Consolidated Interim Financial Statements
(Unaudited, Tabular amounts in thousands of US Dollars, except share and per share amounts)

As at March 31, 2025, the following stock options were outstanding:

Weighted Average Exercise Prices	Number of <br>Stock Options	Vested and Exercisable Number of Stock Options	Weighted Average Remaining Life in Years
$10.01 to $20.00 CAD	1,183,477	815,073	2.53
$20.01 to $25.35 CAD	475,578	51,398	4.55
$19.03 CAD ($13.24 USD)	1,659,055	866,471	3.11

(b) Performance Share Unit Plan

The Company has a performance share unit ("PSU") plan pursuant to which the Compensation Committee may grant PSUs to Eligible Persons of the Company or its subsidiaries. Each PSU entitles the holder thereof to receive one common share, its equivalent cash value, or a combination of both, on the redemption date at the discretion of the Compensation Committee.

The continuity of PSUs issued and outstanding is as follows:

	Three Months Ended March 31,
	2025	2024
Outstanding balance, beginning of period	1,014,505	967,921
Forfeited	(38,218)	—
Outstanding balance, end of period	976,287	967,921

These PSUs will vest three years from the date of grant by the Compensation Committee and the number of PSUs that will vest may range from 0% to 200% of the number granted, subject to the satisfaction of certain market and non-market performance conditions. Each vested PSU entitles the holder thereof to receive on or about the applicable date of vesting of such share unit (i) one common share; (ii) a cash amount equal to the fair market value of one common share as at the applicable date of vesting; or (iii) a combination of (i) and (ii), as determined by the Compensation Committee in its sole discretion. The Company has elected to settle its PSUs using a combination of cash and common shares in the past. As such, based on its history of past settlements, PSUs are classified as liabilities.

For PSUs with non-market performance conditions, the fair value of the share units granted was initially recognized at the fair value using the share price at the date of grant, and subsequently remeasured at fair value on each balance sheet date. For PSUs with market performance conditions, the fair value was determined using a Geometric Brownian Motion model. As at March 31, 2025, the fair value of the PSU liability was $7.1 million (December 31, 2024 - $6.6 million) of which $3.9 million (December 31, 2024 - $4.1 million) was recognized in accounts payable and accrued liabilities and the remainder in other non-current liabilities.

Notes to Financial Statements | Page 16

Ero Copper Corp.
Notes to Condensed Consolidated Interim Financial Statements
(Unaudited, Tabular amounts in thousands of US Dollars, except share and per share amounts)

The Deferred Share Unit ("DSU") plan was established by the Board as a component of compensation for the Company's independent directors. Pursuant to the DSU Plan, DSUs may only be settled by way of cash payment. A participant is not entitled to payment in respect of the DSUs until his or her death, retirement or removal from the Board. The settlement amount of each DSU is based on the fair market value of a common share on the DSU redemption date multiplied by the number of DSUs being redeemed.

The continuity of DSUs issued and outstanding is as follows:

	Three months ended March 31,
	2025	2024
Outstanding balance, beginning of period	325,111	307,312
Issued	6,101	5,425
Outstanding balance, end of period	331,212	312,737

At March 31, 2025, DSU liabilities had a fair value of $4.0 million (December 31, 2024 - $4.4 million) which has been recognized in accounts payable and accrued liabilities.

(d) Restricted Share Unit Plan

The Company has a restricted share unit ("RSU") plan pursuant to which the Compensation Committee may grant share units to Eligible Persons of the Company or its subsidiaries. The fair value of these restricted share units is determined on the date of grant using the market price of the Company’s shares. Each RSU entitles the holder thereof to receive one common share, its equivalent cash value, or a combination of both, on the redemption date at the discretion of the Compensation Committee. The RSUs are equity classified based on the history of past settlements.

The continuity of RSUs issued and outstanding is as follows:

	Three months ended March 31,
	2025	2024
Outstanding balance, beginning of period	328,180	340,570
Settled	(1,204)	—
Forfeited	(12,259)	—
Outstanding balance, end of period	314,717	340,570

Notes to Financial Statements | Page 17

Ero Copper Corp.
Notes to Condensed Consolidated Interim Financial Statements
(Unaudited, Tabular amounts in thousands of US Dollars, except share and per share amounts)

(e) Share-based compensation


	2025		2024
Stock options	$	491	$	684
Performance share unit plan	532		3,913
Deferred share unit plan	(368)		1,278
Restricted share unit plan	518		670
Share-based compensation(1)	$	1,173	$	6,545

(1) For the three months ended March 31, 2025, the Company recorded $1.0 million (three months ended March 31, 2024 - $1.4 million) of share-based compensation in contributed surplus, and the remaining share-based compensation was recorded in liabilities.

(f) Net Income (Loss) per Share


	2025		2024
Weighted average number of common shares outstanding	103,564,654		102,769,444
Dilutive effects of:
Stock options	25,366		—
Share units	314,717		—
Weighted average number of diluted common shares outstanding(1)	103,904,737		102,769,444
Net income (loss) attributable to owners of the Company	$	80,227	$	(7,141)
Basic net income (loss) per share	$	0.77	$	(0.07)
Diluted net income (loss) per share	$	0.77	$	(0.07)

(1) Weighted average number of diluted common shares outstanding for the three months ended March 31, 2025 excluded 949,663 (three months ended March 31, 2024 - 724,936) stock options and nil share units (three months ended March 31, 2024 - 340,570) that were anti-dilutive.

Notes to Financial Statements | Page 18

Ero Copper Corp.
Notes to Condensed Consolidated Interim Financial Statements
(Unaudited, Tabular amounts in thousands of US Dollars, except share and per share amounts)

Revenue


	2025		2024
Copper
Export sales	$	108,639	$	73,652
Adjustments on provisional sales(1)	863		204
	109,502		73,856
Gold
Sales	13,340		26,014
Amortization of deferred revenue(2)	2,246		5,923
	$	15,586	$	31,937
	$	125,088	$	105,793

(1) Adjustments on provisional sales include both pricing and quantity adjustments. Provisionally priced sales to the Company's international customers are settled with a final sales price between zero to six months (March 31, 2024 - zero to one month) after shipment takes place and, therefore, are exposed to commodity price changes.

(2) During the three months ended March 31, 2025, the Company delivered 1,367 ounces of gold (three months ended March 31, 2024 - 4,555 ounces of gold) under a precious metals purchase agreement with Royal Gold (note 11) for average cash consideration of $570 per ounce (three months ended March 31, 2024 - $417 per ounces) and recognized $2.2 million in amortization of deferred revenue (three months ended March 31, 2024 - $5.9 million).

Cost of Sales


	2025		2024
Materials	$	11,690	$	10,404
Salaries and benefits	18,903		15,848
Contracted services	8,216		8,454
Maintenance costs	9,523		7,244
Utilities	4,146		3,667
Other costs	404		236
Change in inventory (excluding depreciation and depletion)	(5,416)		3,629
Cost of production	47,466		49,482
Sales expense and others	3,854		2,290
Depreciation and depletion	20,374		21,268
Change in inventory (depreciation and depletion)	(2,128)		1,576
	$	69,566	$	74,616

Notes to Financial Statements | Page 19

Ero Copper Corp.
Notes to Condensed Consolidated Interim Financial Statements
(Unaudited, Tabular amounts in thousands of US Dollars, except share and per share amounts)

General and Administrative Expenses


	2025		2024
Accounting and legal	$	378	$	380
Amortization and depreciation	374		452
Office and administration	2,272		2,296
Salaries and consulting fees	6,537		6,031
Incentive payments	1,098		1,691
Other	712		664
	$	11,371	$	11,514

17. Finance Expense


	2025		2024
Accretion of deferred revenue	$	579	$	686
Accretion of provision for rehabilitation and closure costs	841		633
Interest on lease liabilities	563		445
Other finance expenses(1)	2,740		2,870
	$	4,723	$	4,634

(1) Other finance expenses during the three months ended March 31, 2025 included $1.3 million (three months ended 2024 - $1.9 million) credit loss on certain accounts receivable (see Note 19).

(2) During the three months ended March 31, 2025, the Company capitalized $11.0 million (three months ended 2024 - $7.4 million) of borrowing costs to projects in progress.

Notes to Financial Statements | Page 20

Ero Copper Corp.
Notes to Condensed Consolidated Interim Financial Statements
(Unaudited, Tabular amounts in thousands of US Dollars, except share and per share amounts)

18. Foreign Exchange Gain (Loss)

The following foreign exchange gains (losses) arise as a result of balances and transactions in the Company’s Brazilian subsidiaries that are denominated in currencies other than the Brazilian Reals (BRL$), which is their functional currency.


	2025		2024
Foreign exchange gain (loss) on denominated debt in Brazil	$	45,103	$	(12,808)
Realized foreign exchange (loss) gain on derivative contracts (note 19)	(2,216)		2,126
Unrealized foreign exchange gain (loss) on derivative contracts (note 19)	16,806		(9,341)
Foreign exchange (loss) gain on other financial assets and liabilities	(1,293)		1,027
	$	58,400	$	(18,996)

All values are in US Dollars.

19. Financial Instruments

Fair value

Fair values of financial assets and liabilities are determined based on available market information and valuation methodologies appropriate to each situation.

As at March 31, 2025, derivatives were measured at fair value based on Level 2 inputs.

The carrying values of cash and cash equivalents, accounts receivable, deposits, and accounts payable and accrued liabilities approximate their fair values due to their short terms to maturity or the discount rate used approximates to the contractual interest rate. At March 31, 2025, the carrying value of loans and borrowings, including accrued interest, was $642.3 million while the fair value is approximately $633.0 million. At March 31, 2025, the carrying value of notes receivable, including accrued interest, was $12.0 million which approximates its fair value.

Credit risk

	March 31, 2025		December 31, 2024
Cash and cash equivalents	$	80,573	$	50,402
Accounts receivable	63,606		18,399
Derivatives	271		—
Note receivable	11,983		12,009
Deposits and other assets	5,104		4,961
	$	161,537	$	85,771

Notes to Financial Statements | Page 21

Ero Copper Corp.
Notes to Condensed Consolidated Interim Financial Statements
(Unaudited, Tabular amounts in thousands of US Dollars, except share and per share amounts)

The Company invests cash and cash equivalents with financial institutions that are financially sound based on their credit rating.

The Company’s exposure to credit risk associated with accounts receivable is influenced mainly by the individual characteristics of each customer.

At March 31, 2025, PMA continued to be in default of the agreement and the gross amount of accounts and note receivable from PMA was $22.5 million (December 31, 2024 - $20.7 million). Accordingly, the note receivable is considered credit impaired, and the Company recorded a credit loss provision and present value discount of $14.1 million (December 31, 2024 - $13.1 million). The carrying value of the PMA note receivable at March 31, 2025 was $8.4 million (December 31, 2024 - $7.6 million.), of which $4.4 million (December 31, 2024 - $3.9 million) was included in other current assets. No adjustment was required on the credit loss provision in the three months ended March 31, 2025 (provision of $1.9 million for the three months ended March 31, 2024).

Liquidity risk

The table below shows the Company's maturity of non-derivative financial liabilities on March 31, 2025:

Non-derivative financial liabilities	Carrying <br>value		Contractual cash flows		Up to <br>12 months		1 - 2 <br>years		3 - 5 <br>years		More than <br>5 years
Loans and borrowings (including interest)	$	642,339	$	829,503	$	89,901	$	111,845	$	627,757	$	—
Accounts payable and accrued liabilities	128,737		129,884		129,884		—		—		—
Other non-current liabilities	6,990		16,453		—		15,463		604		386
Leases	22,389		24,575		15,446		8,797		333		—
Total	$	800,455	$	1,000,415	$	235,231	$	136,105	$	628,694	$	386

The Company also has a derivative financial liability for foreign exchange collar contracts whose notional amounts and maturity information are disclosed below under foreign exchange currency risk.

Notes to Financial Statements | Page 22

Ero Copper Corp.
Notes to Condensed Consolidated Interim Financial Statements
(Unaudited, Tabular amounts in thousands of US Dollars, except share and per share amounts)

Market risk

Market risk is the risk of loss that may arise from changes in market factors such as interest rates, foreign exchange rates, and commodity prices. The purpose of market risk management is to manage and control exposures to market risks, within acceptable parameters, while optimizing return.

The Company may use derivatives, including options, forwards and swap contracts, to manage market risks.

The Company's outstanding derivative instruments as of March 31, 2025 are as follows:

Contract Description	Notional Amount	Denomination	Weighted average floor	Weighted average cap / forward price	Maturities
Foreign exchange collar (i)	$332.5 million	USD/BRL	5.52	6.49	April 2025 - June 2026
Copper collar (iii)	18,000 tonnes	$ / lb	4.00	4.68	April 2025 - September 2025
Gold collar (iii)	22,500 ounces	$ / oz	$2,200	$3,425	April 2025 - December 2025

(i) Foreign exchange currency risk

The Company may use certain foreign exchange derivatives, including collars and forward contracts, to manage its foreign exchange risks. At March 31, 2025, the aggregate fair value of the Company's foreign exchange derivatives was a net liability of $1.8 million (December 31, 2024 - liability of $17.9 million), of which $0.3 million is included in other current assets, $1.5 million is included in current portion of derivatives liabilities, and $0.6 million is included in other non-current liabilities. The fair values of foreign exchange contracts were determined based on option pricing models, forward foreign exchange rates, and information provided by the counter party.

The change in fair value of foreign exchange derivatives was an unrealized gain of $16.8 million for the three months ended March 31, 2025 (a loss of $9.3 million for the three months ended March 31, 2024) and has been recognized in foreign exchange (loss) gain. In addition, during the three months ended March 31, 2025, the Company recognized a realized loss of $2.2 million (realized gain of $2.1 million for the three months ended March 31, 2024) related to the settlement of foreign currency forward collar contracts.

Notes to Financial Statements | Page 23

Ero Copper Corp.
Notes to Condensed Consolidated Interim Financial Statements
(Unaudited, Tabular amounts in thousands of US Dollars, except share and per share amounts)

(ii) Interest rate risk

(iii) Price risk

The Company may use derivatives, including forward contracts, collars and swap contracts, to manage commodity price risks.

At March 31, 2025, the Company also had gold collar contracts on 2,500 ounces of gold per month from April 2025 to December 2025. These gold derivative contracts establish an average floor price of $2,200 per ounce of gold and an average cap price of $3,425 per ounce. As of March 31, 2025, the fair value of these contracts was a net liability of $0.9 million (December 31, 2024 - liability of $0.1 million). The fair value of gold collar contracts was determined based on option pricing models, forward gold price, and information provided by counter party.

At March 31, 2025, the Company had provisionally priced sales that are exposed to commodity price changes (note 14). Based on the Company’s net exposure at March 31, 2025, a 10% change in the price of copper would have changed pre-tax net income (loss) by $11.0 million.

Notes to Financial Statements | Page 24

Ero Copper Corp.
Notes to Condensed Consolidated Interim Financial Statements
(Unaudited, Tabular amounts in thousands of US Dollars, except share and per share amounts)

Supplemental Cash Flow Information


Net change in non-cash working capital items:	2025		2024
Accounts receivable	$	(45,062)	$	(3,018)
Inventories	(8,008)		3,629
Other assets	(1,674)		(6,632)
Accounts payable and accrued liabilities	11,978		(14,553)
	$	(42,766)	$	(20,574)
Non-cash investing and financing activities:
Additions to property, plant and equipment by leases	$	7,175	$	4,034
Non-cash (decrease) increase in accounts payable in relation to capital expenditures	(1,938)		2,070

Notes to Financial Statements | Page 25

Document

	TSX: ERO
NYSE: ERO

May 5, 2025

Ero Copper Reports First Quarter 2025 Operating and Financial Results

(all amounts in US dollars, unless otherwise noted)

Vancouver, British Columbia – Ero Copper Corp. (TSX: ERO, NYSE: ERO) (“Ero” or the “Company”) is pleased to announce its operating and financial results for the three months ended March 31, 2025. Management will host a conference call tomorrow, Tuesday, May 6, 2025, at 11:30 a.m. Eastern time to discuss the results. Dial-in details for the call can be found near the end of this press release.

HIGHLIGHTS

•Consolidated first quarter copper production was 12,424 tonnes, reflecting the continued commissioning and ramp-up of the Tucumã Operation.

◦The Tucumã Operation produced 5,067 tonnes of copper in concentrate, with more than half of production occurring in March following the completion of planned maintenance in January and February.

◦The Caraíba Operations produced 7,357 tonnes of copper in concentrate at an average C1 cash cost(*) of $2.22 per pound.

•Gold production during the quarter was 6,638 ounces at an average C1 cash cost(*) and All-in Sustaining Cost ("AISC")(*) of $1,100 and $2,228 per ounce, respectively.

•Quarterly financial performance reflected higher metals prices and increased production from the Tucumã Operation, which contributed to quarter-on-quarter improvements in net income and adjusted EBITDA(*)

◦Net income attributable to the owners of the Company of $80.2 million ($0.77 per share on a diluted basis).

◦Adjusted net income attributable to the owners of the Company(*) of $35.8 million ($0.35 per share on a diluted basis).

◦Adjusted EBITDA(*) of $63.2 million.

(*) These are non-IFRS measures and do not have a standardized meaning prescribed by IFRS and might not be comparable to similar financial measures disclosed by other issuers. Please refer to the Company’s discussion of Non-IFRS measures in its Management’s Discussion and Analysis for the three months ended March 31, 2025 and the Reconciliation of Non-IFRS Measures section at the end of this press release.

1	Ero Copper Corp
	625 Howe Street	Suite 1050	Vancouver	BC	V6C 2T6	Canada
	TSX: ERO
---	---
NYSE: ERO

•The Company is reaffirming its 2025 production, operating cost and capital expenditure guidance.

◦The Tucumã Operation remains on track to achieve commercial production in H1 2025, following the successful completion of repairs to and commissioning of the third tailings filter in April 2025.

◦At the Caraíba Operations, the Company achieved targeted mining rates at the Pilar Mine in March 2025 and completed mobilization of a second underground development contractor during the quarter. These milestones are expected to support sequential growth in production volumes through the rest of the year.

◦At the Xavantina Operations, ongoing investments in mine modernization and mechanization are anticipated to support sequential increases in mined and processed volumes through the remainder of the year. Gold grades are also expected to improve, supporting higher production levels and lower unit costs.

Makko DeFilippo, President and Chief Executive Officer, commented: "We remain laser-focused on the execution of our 2025 strategy and are encouraged by the positive momentum across our portfolio, evidenced by strong late-quarter performance, particularly at Tucumã.

"At Caraíba, mining rates at the Pilar Mine are now tracking to plan, supported by the successful mobilization of a second development contractor during the quarter - an important step toward improving operational flexibility for the balance of the year. At Xavantina, our capital investments in growth and asset integrity, which we are advancing through our partnership with Royal Gold, are showing early signs of success. In parallel, we continue to advance the step-change growth opportunity we see at Furnas, where drilling is progressing well with eight rigs currently operating on site.

"With a portfolio of high-margin, high-growth assets and exposure to a commodity essential for the future, our fundamentals are strong. We are focused on making 2025 a record year of copper production at Ero, investing in innovation and operational flexibility to improve margins, and advancing long-term value creation at Furnas."

2	Ero Copper Corp
	625 Howe Street	Suite 1050	Vancouver	BC	V6C 2T6	Canada
	TSX: ERO
---	---
NYSE: ERO

FIRST QUARTER REVIEW

The Caraíba Operations

•Copper production totaled 7,357 tonnes, reflecting lower planned mined and processed copper grades during the quarter. This resulted in an average C1 cash cost(*) of $2.22 per pound.

•The Company completed the mobilization of a second underground development contractor and achieved targeted mining rates at the Pilar Mine in March 2025, which are expected to be maintained through the rest of the year.

The Tucumã Operation

•Commissioning and ramp-up of the Tucumã Operation progressed during Q1 2025, with a 32% quarter-on-quarter increase in ore tonnes processed. More than half of the quarter's total throughput and production was achieved in March, following the completion of maintenance activities aimed at addressing bottlenecks identified in Q4 2024.

•The plant processed 294,314 tonnes during the quarter. Copper head grades and metallurgical recovery rates averaged 2.18% and 89.4%, respectively, resulting in production of 5,067 tonnes of copper in concentrate, after accounting for a build in work-in-progress inventory.

•In April 2025, the Company successfully completed repairs to and commissioning of the third tailings filter, with commercial production on track to be achieved in H1 2025.

•C1 cash costs for the Tucumã Operation will be reported following the achievement of commercial production.

The Xavantina Operations

•Quarterly gold production totaled 6,638 ounces, reflecting lower mined and processed grades despite an increase of 27.2% in tonnes mined and processed. As a result, C1 cash costs(*) and AISC(*) averaged $1,100 and $2,228 per ounce, respectively.

•While decreased production levels were anticipated, grades encountered within planned operational levels were slightly lower than expected. Additional ground support was also required in several newly developed higher-grade levels of the Santo Antônio vein, delaying mining activities within these areas and further impacting quarterly production.

3	Ero Copper Corp
	625 Howe Street	Suite 1050	Vancouver	BC	V6C 2T6	Canada
	TSX: ERO
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NYSE: ERO

OPERATING HIGHLIGHTS

	2025 - Q1		2024 - Q4		2024 - Q1
Copper (Caraíba Operations)
Ore Mined (tonnes)	696,239		713,980		788,332
Ore Processed (tonnes)	692,901		719,942		853,371
Grade (% Cu)	1.18		1.30		1.08
Recovery (%)	90.2		91.8		88.1
Cu Production (tonnes)	7,357		8,566		8,091
Cu Production (000 lbs)	16,219		18,883		17,838
Cu Sold in Concentrate (tonnes)	6,949		8,420		9,461
Cu Sold in Concentrate (000 lbs)	15,318		18,563		20,859
Cu C1 cash cost(1)(2)	$	2.22	$	1.85	$	2.30
Copper (Tucumã Operation)
Ore Mined (tonnes)	328,291		1,065,108		—
Ore Processed (tonnes)	294,314		223,013		—
Grade (% Cu)	2.18		2.17		—
Recovery (%)	89.4		89.1		—
Cu Production (tonnes)	5,067		4,317		—
Cu Production (000 lbs)	11,171		9,516		—
Cu Sold in Concentrate (tonnes)	5,168		3,750		—
Cu Sold in Concentrate (000 lbs)	11,393		8,268		—
Gold (Xavantina Operations)
Ore Mined (tonnes)	33,228		26,119		37,834
Ore Processed (tonnes)	33,228		26,120		37,834
Grade (g / tonne)	6.87		11.18		16.38
Recovery (%)	90.8		92.8		91.5
Au Production (oz)	6,638		8,936		18,234
Au Sold (oz)	5,834		11,106		16,853
Au C1 cash cost(1)	$	1,100	$	744	$	395
Au AISC(1)	$	2,228	$	1,691	$	797

(1) EBITDA, adjusted EBITDA, adjusted net income (loss) attributable to owners of the Company, adjusted net income (loss) per share attributable to owners of the Company, net (cash) debt, working capital, copper C1 cash cost, copper C1 cash cost including foreign exchange hedges, gold C1 cash cost and gold AISC are non-IFRS measures. These measures do not have a standardized meaning prescribed by IFRS and might not be comparable to similar financial measures disclosed by other issuers. Please refer to the Company’s discussion of Non-IFRS measures in its Management’s Discussion and Analysis for the three months ended March 31, 2025 and the Reconciliation of Non-IFRS Measures section at the end of this press release.

(2) Copper C1 cash cost including foreign exchange hedges was $2.36 in Q1 2025 (Q1 2024 - $2.28).

4	Ero Copper Corp
	625 Howe Street	Suite 1050	Vancouver	BC	V6C 2T6	Canada
	TSX: ERO
---	---
NYSE: ERO

FINANCIAL HIGHLIGHTS

($ in millions, except per share amounts)

	2025 - Q1		2024 - Q4		2024 - Q1
Revenues	$	125.1	$	122.5	$	105.8
Gross profit	55.5		52.4		31.2
EBITDA(1)	117.9		(31.4)		17.8
Adjusted EBITDA(1)	63.2		59.1		43.3
Cash flow from operations	65.4		60.8		17.2
Net income (loss)	80.6		(48.9)		(6.8)
Net income (loss) attributable to owners of the Company	80.2		(48.9)		(7.1)
Per share (basic)	0.77		(0.47)		(0.07)
Per share (diluted)	0.77		(0.47)		(0.07)
Adjusted net income attributable to owners of the Company(1)	35.8		17.4		16.8
Per share (basic)	0.35		0.17		0.16
Per share (diluted)	0.35		0.17		0.16
Cash, cash equivalents, and short-term investments	80.6		50.4		51.7
Working capital (deficit)(1)	10.2		(69.9)		(28.6)
Net debt(1)	561.8		551.8		415.1

5	Ero Copper Corp
	625 Howe Street	Suite 1050	Vancouver	BC	V6C 2T6	Canada
	TSX: ERO
---	---
NYSE: ERO

2025 PRODUCTION AND COST GUIDANCE(*)

Consolidated Copper Production (tonnes)
Caraíba Operations	37,500 - 42,500
Tucumã Operation	37,500 - 42,500
Total Copper	75,000 - 85,000
Consolidated Copper C1 Cash Cost(1) Guidance
Caraíba Operations	$2.15 - $2.35
Tucumã Operation	$1.05 - $1.25
Consolidated Copper Operations	$1.55 - $1.80
The Xavantina Operations
Au Production (ounces)	50,000 - 60,000
Gold C1 Cash Cost(1) Guidance	$650 - $800
Gold AISC(1) Guidance	$1,400 - $1,600

(1) Please refer to the section titled "Alternative Performance (Non-IFRS) Measures" within the MD&A.

6	Ero Copper Corp
	625 Howe Street	Suite 1050	Vancouver	BC	V6C 2T6	Canada
	TSX: ERO
---	---
NYSE: ERO

2025 CAPITAL EXPENDITURE GUIDANCE(*)

Capital expenditure guidance remains unchanged at a range of $230 to $270 million, excluding capitalized ramp-up costs prior to the declaration of commercial production at the Tucumã Operation.

Figures presented in the table below are in USD millions.

Caraíba Operations	$165 - $180
Tucumã Operation(1)	$30 - $40
Xavantina Operations	$25 - $35
Furnas Copper-Gold Project and Other Exploration	$10 - $15
Total	$230 - $270

Note: Guidance is based on certain estimates and assumptions, including but not limited to, mineral reserve estimates, grade and continuity of interpreted geological formations and metallurgical performance. Please refer to the Company’s most recent Annual Information Form and Management of Risks and Uncertainties in the MD&A for complete risk factors.

(1) Excludes capitalized ramp-up costs prior to the declaration of commercial production at the Tucumã Operation.

7	Ero Copper Corp
	625 Howe Street	Suite 1050	Vancouver	BC	V6C 2T6	Canada
	TSX: ERO
---	---
NYSE: ERO

CONFERENCE CALL DETAILS

The Company will hold a conference call on Tuesday, May 6, 2025 at 11:30 am Eastern time (8:30 am Pacific time) to discuss these results. A results presentation will be available for download via the webcast link and in the Presentations section of the Company's website on the day of the conference call.

Date:	Tuesday, May 6, 2025
Time:	11:30 am Eastern time (8:30 am Pacific time)
Dial in:	Canada/USA Toll Free: 1-833-752-3380<br><br>International: +1-647-846-2821<br><br><br><br>Please dial in 5-10 minutes prior to the start of the call or pre-register using this link to bypass the live operator queue.<br><br><br><br>(https://dpregister.com/sreg/10197761/feb2f3e007)
Webcast:	To access the webcast, click here.<br><br><br><br>(https://event.choruscall.com/mediaframe/webcast.html?webcastid=uEfitmx3)
Replay:	Canada/USA: 1-855-669-9658, International: +1-412-317-0088<br><br>For country-specific dial-in numbers, click here.<br><br><br><br>(https://services.choruscall.com/ccforms/replay.html)
Replay Passcode:	4434787
8	Ero Copper Corp
---	---
	625 Howe Street	Suite 1050	Vancouver	BC	V6C 2T6	Canada
	TSX: ERO
---	---
NYSE: ERO

Reconciliation of Non-IFRS Measures

Financial results of the Company are presented in accordance with IFRS. The Company utilizes certain alternative performance (non-IFRS) measures to monitor its performance, including copper C1 cash cost, copper C1 cash cost including foreign exchange hedges, gold C1 cash cost, gold AISC, EBITDA, adjusted EBITDA, adjusted net income attributable to owners of the Company, adjusted net income per share, net (cash) debt, working capital and available liquidity. These performance measures have no standardized meaning prescribed within generally accepted accounting principles under IFRS and, therefore, amounts presented may not be comparable to similar measures presented by other mining companies. These non-IFRS measures are intended to provide supplemental information and should not be considered in isolation or as a substitute for measures of performance prepared in accordance with IFRS.

For additional details please refer to the Company’s discussion of non-IFRS and other performance measures in its Management’s Discussion and Analysis for the three months ended March 31, 2025 which is available on SEDAR+ at www.sedarplus.ca, and on EDGAR at www.sec.gov.

9	Ero Copper Corp
	625 Howe Street	Suite 1050	Vancouver	BC	V6C 2T6	Canada
	TSX: ERO
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NYSE: ERO

Copper C1 cash cost and copper C1 cash cost including foreign exchange hedges

The following table provides a reconciliation of copper C1 cash cost to cost of production, its most directly comparable IFRS measure.

Reconciliation:	2025 - Q1		2024 - Q4		2024 - Q1
Cost of production	$	35,719	$	33,685	$	42,227
Add (less):
Transportation costs & other	1,322		1,149		1,252
Treatment, refining, and other	2,410		2,934		5,170
By-product credits	(4,699)		(5,163)		(2,440)
Incentive payments	(1,289)		1,127		(1,199)
Net change in inventory	2,659		927		(3,893)
Foreign exchange translation and other	(147)		168		(7)
C1 cash costs(1)	35,975		34,827		41,110
(Gain) loss on foreign exchange hedges	2,216		4,166		(276)
C1 cash costs including foreign exchange hedges	$	38,191	$	38,993	$	40,834
Mining	$	25,796	$	24,906	$	25,256
---	---	---	---	---	---	---
Processing	6,352		6,580		7,177
Indirect	6,116		5,570		5,947
Production costs	38,264		37,056		38,380
By-product credits	(4,699)		(5,163)		(2,440)
Treatment, refining and other	2,410		2,934		5,170
C1 cash costs(1)	35,975		34,827		41,110
(Gain) loss on foreign exchange hedges	2,216		4,166		(276)
C1 cash costs including foreign exchange hedges	$	38,191	$	38,993	$	40,834

(1) Copper C1 cash costs for 2025 and 2024 do not include Tucumã Operation's results, as commercial production has not been achieved as of March 31, 2025.

10	Ero Copper Corp
	625 Howe Street	Suite 1050	Vancouver	BC	V6C 2T6	Canada
	TSX: ERO
---	---
NYSE: ERO
	2024 - Q4		2024 - Q3		2023 - Q4
---	---	---	---	---	---	---
Costs per pound
Total copper produced (lbs, 000)	16,219		18,883		17,838
Mining	$	1.59	$	1.32	$	1.42
Processing	$	0.39	$	0.35	$	0.40
Indirect	$	0.38	$	0.29	$	0.33
By-product credits	$	(0.29)	$	(0.27)	$	(0.14)
Treatment, refining and other	$	0.15	$	0.16	$	0.29
Copper C1 cash costs(1)	$	2.22	$	1.85	$	2.30
(Gain) loss on foreign exchange hedges	$	0.14	$	0.22	$	(0.02)
Copper C1 cash costs including foreign exchange hedges	$	2.36	$	2.07	$	2.28

(1)Copper C1 cash costs for 2025 and 2024 do not include Tucumã Operation's results, as commercial production has not been achieved as of March 31, 2025.

Gold C1 cash cost and gold AISC

The following table provides a reconciliation of gold C1 cash cost and gold AISC to cost of production, its most directly comparable IFRS measure.

Reconciliation:	2025 - Q1		2024 - Q4		2024 - Q1
Cost of production	$	6,225	$	9,000	$	7,255
Add (less):
Incentive payments	(269)		(434)		(443)
Net change in inventory	1,339		(1,914)		264
By-product credits	(111)		(189)		(189)
Smelting and refining	35		62		90
Foreign exchange translation and other	82		125		232
C1 cash costs	$	7,301	$	6,650	$	7,209
Site general and administrative	1,077		1,576		1,353
Accretion of mine closure and rehabilitation provision	141		78		92
Sustaining capital expenditure	3,909		4,597		3,254
Sustaining lease payments	2,021		1,681		2,122
Royalties and production taxes	338		526		510
AISC	$	14,787	$	15,108	$	14,540	11	Ero Copper Corp
---	---
	625 Howe Street	Suite 1050	Vancouver	BC	V6C 2T6	Canada
	TSX: ERO
---	---
NYSE: ERO
	2025 - Q1		2024 - Q4		2024 - Q1
---	---	---	---	---	---	---
Costs
Mining	$	3,760	$	3,325	$	3,820
Processing	2,206		2,162		2,259
Indirect	1,411		1,290		1,229
Production costs	7,377		6,777		7,308
Smelting and refining costs	35		62		90
By-product credits	(111)		(189)		(189)
C1 cash costs	$	7,301	$	6,650	$	7,209
Site general and administrative	1,077		1,576		1,353
Accretion of mine closure and rehabilitation provision	141		78		92
Sustaining capital expenditure	3,909		4,597		3,254
Sustaining leases	2,021		1,681		2,122
Royalties and production taxes	338		526		510
AISC	$	14,787	$	15,108	$	14,540
Costs per ounce
Total gold produced (ounces)	6,638		8,936		18,234
Mining	$	566	$	372	$	209
Processing	$	332	$	242	$	124
Indirect	$	213	$	144	$	67
Smelting and refining	$	5	$	7	$	5
By-product credits	$	(16)	$	(21)	$	(10)
Gold C1 cash cost	$	1,100	$	744	$	395
Gold AISC	$	2,228	$	1,691	$	797	12	Ero Copper Corp
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	625 Howe Street	Suite 1050	Vancouver	BC	V6C 2T6	Canada
	TSX: ERO
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NYSE: ERO

Earnings before interest, taxes, depreciation and amortization (EBITDA) and Adjusted EBITDA

The following table provides a reconciliation of EBITDA and Adjusted EBITDA to net income, its most directly comparable IFRS measure.

Reconciliation:	2025 - Q1		2024 - Q4		2024 - Q1
Net Income (Loss)	$	80,627	$	(48,928)	$	(6,830)
Adjustments:
Finance expense	4,723		3,851		4,634
Finance income	(838)		(690)		(1,468)
Income tax expense (recovery)	14,741		(5,862)		(1,853)
Amortization and depreciation	18,620		20,265		23,296
EBITDA	$	117,873	$	(31,364)	$	17,779
Foreign exchange (gain) loss	(58,400)		92,804		18,996
Share based compensation	1,173		(7,496)		6,545
Change in rehabilitation and closure provision(1)	—		4,609		—
Write-down of exploration and evaluation asset	—		839		—
Unrealized loss (gain) on commodity derivatives	2,102		(250)		(64)
Xavantina Gold Stream transaction fees	458		—		—
Adjusted EBITDA	$	63,206	$	59,142	$	43,256

13	Ero Copper Corp
	625 Howe Street	Suite 1050	Vancouver	BC	V6C 2T6	Canada
	TSX: ERO
---	---
NYSE: ERO

Adjusted net income attributable to owners of the Company and Adjusted net income per share attributable to owners of the Company

Reconciliation:	2025 - Q1		2024 - Q4		2024 - Q1
Net income (loss) as reported attributable to the owners of the Company	$	80,227	$	(48,944)	$	(7,141)
Adjustments:
Share based compensation	1,173		(7,496)		6,545
Unrealized foreign exchange (gain) loss on USD denominated balances in MCSA	(39,628)		66,971		11,257
Unrealized foreign exchange (gain) loss on foreign exchange derivative contracts	(16,739)		15,182		9,304
Change in rehabilitation and closure provision(1)	—		4,591		—
Write-down of exploration and evaluation asset	—		836		—
Unrealized loss (gain) on commodity derivatives	2,079		(243)		(64)
Xavantina Gold Stream transaction fees	458		—		—
Tax effect on the above adjustments	8,279		(13,459)		(3,128)
Adjusted net income attributable to owners of the Company	$	35,849	$	17,438	$	16,773
Weighted average number of common shares
Basic	103,564,654		103,345,064		102,769,444
Diluted	103,904,737		103,877,690		103,242,437
Adjusted EPS
Basic	$	0.35	$	0.17	$	0.16
Diluted	$	0.35	$	0.17	$	0.16

14	Ero Copper Corp
	625 Howe Street	Suite 1050	Vancouver	BC	V6C 2T6	Canada
	TSX: ERO
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NYSE: ERO

Net Debt (Cash)

The following table provides a calculation of net debt (cash) based on amounts presented in the Company’s condensed consolidated interim financial statements as at the periods presented.

	March 31, 2025		December 31, 2024		March 31, 2024
Current portion of loans and borrowings	$	52,479	$	45,893	$	16,059
Long-term portion of loans and borrowings	589,860		556,296		450,743
Less:
Cash and cash equivalents	(80,573)		(50,402)		(51,692)
Short-term investments	—		—		—
Net debt (cash)	$	561,766	$	551,787	$	415,110

Working Capital and Available Liquidity

The following table provides a calculation for these based on amounts presented in the Company’s condensed consolidated interim financial statements as at the periods presented.

	March 31, 2025		December 31, 2024		March 31, 2024
Current assets	$	232,292	$	141,790	$	129,960
Less: Current liabilities	(222,048)		(211,706)		(158,565)
Working capital (deficit)	$	10,244	$	(69,916)	$	(28,605)
Cash and cash equivalents	80,573		50,402		51,692
Available undrawn revolving credit facilities(1)	35,000		15,000		105,000
Available undrawn prepayment facilities(2)	$	—	$	25,000	$	—
Available liquidity	$	115,573	$	90,402	$	156,692

(1) In January 2025, the Company amended its Senior Credit Facility to increase the limit from $150.0 million to $200.0 million and extended the maturity from December 2026 to December 2028.

(2) In March 2025, the Company exercised its option to increase the size of its copper prepayment facility from $50.0 million to $75.0 million.

15	Ero Copper Corp
	625 Howe Street	Suite 1050	Vancouver	BC	V6C 2T6	Canada
	TSX: ERO
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NYSE: ERO

ABOUT ERO COPPER CORP

Ero Copper is a high-margin, high-growth copper producer with operations in Brazil and corporate headquarters in Vancouver, B.C. The Company's primary asset is a 99.6% interest in the Brazilian copper mining company, Mineração Caraíba S.A. ("MCSA"), 100% owner of the Company's Caraíba Operations, which are located in the Curaçá Valley, Bahia State, Brazil, and the Tucumã Operation, an open pit copper mine located in Pará State, Brazil. The Company also owns 97.6% of NX Gold S.A. ("NX Gold") which owns the Xavantina Operations, an operating gold and silver mine located in Mato Grosso State, Brazil. In July 2024, the Company signed a definitive earn-in agreement with Vale Base Metals for a 60% interest in the Furnas Copper-Gold Project, located in the Carajás Mineral Province in Pará State, Brazil. For more information on the earn-in agreement, please see the Company's press releases dated October 30, 2023 and July 22, 2024. Additional information on the Company and its operations, including technical reports on the Caraíba Operations, Xavantina Operations, Tucumã Operation and the Furnas Copper-Gold Project, can be found on the Company’s website (www.erocopper.com), on SEDAR+ (www.sedarplus.ca/landingpage/) and on EDGAR (www.sec.gov). The Company’s shares are publicly traded on the Toronto Stock Exchange and the New York Stock Exchange under the symbol “ERO”.

FOR MORE INFORMATION, PLEASE CONTACT

Courtney Lynn, Executive Vice President, External Affairs and Strategy

(604) 335-7504

info@erocopper.com

16	Ero Copper Corp
	625 Howe Street	Suite 1050	Vancouver	BC	V6C 2T6	Canada
	TSX: ERO
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NYSE: ERO

CAUTION REGARDING FORWARD LOOKING INFORMATION AND STATEMENTS

This press release contains “forward-looking statements” within the meaning of the United States Private Securities Litigation Reform Act of 1995 and “forward-looking information” within the meaning of applicable Canadian securities legislation (collectively, “forward-looking statements”). Forward-looking statements include statements that use forward-looking terminology such as “may”, “could”, “would”, “will”, “should”, “intend”, “target”, “plan”, “expect”, “budget”, “estimate”, “forecast”, “schedule”, “anticipate”, “believe”, “continue”, “potential”, “view” or the negative or grammatical variation thereof or other variations thereof or comparable terminology. Forward-looking statements may include, but are not limited to, statements with respect to the Company's expected development and mining rates, production, operating costs and capital expenditures at the Caraíba Operations, the Tucumã Operation and the Xavantina Operations; estimated timing for certain milestones, including the achievement of commercial production at the Tucumã Operation in H1 2025; expectations related to exploration activities at the Furnas Project; and any other statement that may predict, forecast, indicate or imply future plans, intentions, levels of activity, results, performance or achievements.

Forward-looking statements are subject to a variety of known and unknown risks, uncertainties and other factors that could cause actual results, actions, events, conditions, performance or achievements to materially differ from those expressed or implied by the forward-looking statements, including, without limitation, risks discussed in this press release and in the Company’s Annual Information Form for the year ended December 31, 2023 (“AIF”) under the heading “Risk Factors”. The risks discussed in this press release and in the AIF are not exhaustive of the factors that may affect any of the Company’s forward-looking statements. Although the Company has attempted to identify important factors that could cause actual results, actions, events, conditions, performance or achievements to differ materially from those contained in forward-looking statements, there may be other factors that cause results, actions, events, conditions, performance or achievements to differ from those anticipated, estimated or intended.

The Company’s forward-looking statements are based on the assumptions, beliefs, expectations and opinions of management on the date the statements are made, many of which may be difficult to predict and beyond the Company’s control. In connection with the forward-looking statements contained in this press release and in the AIF, the Company has made certain assumptions about, among other things: favourable equity and debt capital markets; the ability to raise any necessary additional capital on reasonable terms to advance the production, development and exploration of the Company’s properties and assets; future prices of copper, gold and other metal prices; the timing and results of exploration and drilling programs; the accuracy of any mineral reserve and mineral resource estimates; the geology of the Caraíba Operations, the Xavantina Operations, the Tucumã Operation and the Furnas Copper-Gold Project being as described in the respective technical report for each property; production costs; the accuracy of budgeted exploration, development and construction costs and expenditures; the price of other commodities such as fuel; future currency exchange rates, interest rates and tariff rates; operating conditions being favourable such that the Company is able to operate in a safe, efficient and effective manner; work force continuing to remain healthy in the face of prevailing epidemics, pandemics or other health risks, political and regulatory stability; the receipt of governmental, regulatory and third party approvals, licenses and permits on favourable terms; obtaining required renewals for existing approvals, licenses and permits on favourable terms; requirements under applicable laws; sustained labour stability; stability in financial and capital goods markets; availability of equipment; positive relations with local groups and the Company’s ability to meet its obligations under its agreements with such groups; and satisfying the terms and conditions of the Company’s current loan arrangements. Although the Company believes that the assumptions inherent in forward-looking statements are reasonable as of the date of this press release, these assumptions are subject to significant business, social, economic, political, regulatory, competitive and other risks and uncertainties, contingencies and other factors that could cause actual actions, events, conditions, results, performance or achievements to be materially different from those projected in the forward-looking statements. The Company cautions that the foregoing list of assumptions is not exhaustive. Other events or circumstances could cause actual results to differ materially from those estimated or projected and expressed in, or implied by, the forward-looking statements contained in this press release. There can be no assurance that forward-looking statements will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. Accordingly, readers should not place undue reliance on forward-looking statements.

Forward-looking statements contained herein are made as of the date of this press release and the Company disclaims any obligation to update or revise any forward-looking statement, whether as a result of new information, future events or results or otherwise, except as and to the extent required by applicable securities laws.

CAUTIONARY NOTES REGARDING MINERAL RESOURCE AND MINERAL RESERVE ESTIMATES

Unless otherwise indicated, all reserve and resource estimates included in this press release and the documents incorporated by reference herein have been prepared in accordance with National Instrument 43-101, Standards of Disclosure for Mineral Projects (“NI 43-101") and the Canadian Institute of Mining, Metallurgy and Petroleum (the “CIM”) — CIM Definition Standards on Mineral Resources and Mineral Reserves, adopted by the CIM Council, as amended (the “CIM Standards”). NI 43-101 is a rule developed by the Canadian Securities Administrators that establishes standards for all public disclosure an issuer makes of scientific and technical information concerning mineral projects. Canadian standards, including NI 43-101, differ significantly from the requirements of the United States Securities and Exchange Commission (the “SEC”), and reserve and resource information included herein may not be comparable to similar information disclosed by U.S. companies. In particular, and without limiting the generality of the foregoing, this press release and the documents incorporated by reference herein use the terms “measured resources,” “indicated resources” and “inferred resources” as defined in accordance with NI 43-101 and the CIM Standards.

Pursuant to the new U.S. Rules, the SEC recognizes estimates of “measured mineral resources”, “indicated mineral resources” and “inferred mineral resources”. In addition, the definitions of “proven mineral reserves” and “probable mineral reserves” under the U.S. Rules are now “substantially similar” to the corresponding standards under NI 43-101. Mineralization described using these terms has a greater amount of uncertainty as to its existence and feasibility than mineralization that has been characterized as reserves. Accordingly, U.S. investors are cautioned not to assume that any measured mineral resources, indicated mineral resources, or inferred mineral resources that Ero reports are or will be economically or legally mineable. Further, “inferred mineral resources” have a greater amount of uncertainty as to their existence and as to whether they can be mined legally or economically. Under Canadian securities laws, estimates of “inferred mineral resources” may not form the basis of feasibility or pre-feasibility studies, except in rare cases. While the above terms under the U.S. Rules are “substantially similar” to the standards under NI 43-101 and CIM Standards, there are differences in the definitions under the U.S. Rules and CIM Standards. Accordingly, there is no assurance any mineral reserves or mineral resources that Ero may report as “proven mineral reserves”, “probable mineral reserves”, “measured mineral resources”, “indicated mineral resources” and “inferred mineral resources” under NI 43-101 would be the same had Ero prepared the reserve or resource estimates under the standards adopted under the U.S. Rules.

17	Ero Copper Corp
	625 Howe Street	Suite 1050	Vancouver	BC	V6C 2T6	Canada