SCZM 6-K

UNITEDSTATES

SECURITIESAND EXCHANGE COMMISSION

Washington,D.C. 20549

FORM6-K

Reportof Foreign Private Issuer

Pursuantto Rule 13****a-16or 15d-16

UNDERthe Securities Exchange Act of 1934

For the month of August 2026

Commission File No.: 001-43051

SantacruzSilver Mining Ltd.

(Translation of registrant’s name into English)

480– 1140 West Pender Street

Vancouver,British Columbia

CanadaV6E 4G1

(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 ☒

EXHIBITINDEX

SIGNATURE

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.

Exhibit99.1

	News Release<br><br> <br>August 5, 2026

SantacruzSilver’s Wholly Owned Bolivian Subsidiary, San Lucas, Successfully Completes Fourth Tranche of 70 Million Bolivian Bolivianos PromissoryNote in the Bolivian Market, Further Advancing Transition from Prior Facility

Vancouver,B.C. – Santacruz Silver Mining Ltd. (NASDAQ:SCZM) (TSX.V:SCZ) (“Santacruz” or the “Company”) is pleased to announce that its wholly owned Bolivian subsidiary, Empresa Minera San Lucas S.A. (“San Lucas”), has successfully completed the fourth offering (the “Offering”) under its promissory note program (the “Program”), “Pagarés Bursátiles San Lucas – Emisión 4”, in the Bolivian capital markets on August 4, 2026.

The Offering raised gross proceeds of 70 million Bolivian bolivianos (“Bs” ) through unsecured promissory notes bearing an annual interest rate of 10.9985% and maturing on July 18, 2027.

The Program has a maximum authorized amount of Bs 140 million. The first offering of Bs 70 million was completed on February 27, 2025 and was fully repaid on February 18, 2026. The third offering of Bs 70 million was completed on April 8, 2026, replacing the first offering under the Program and returning the Program to its maximum authorized amount of Bs 140 million. The second offering of Bs 70 million was completed on August 8, 2025, and was fully repaid on June 15, 2026. The Offering of Bs 70 million replaces the second offering under the Program, bringing the Program back to its full authorized amount of Bs 140 million.

The Offering was completed through the Bolsa Boliviana de Valores and was fully subscribed, reflecting continued support from Bolivian institutional investors.

Arturo Préstamo, Executive Chairman and CEO of Santacruz, commented: “The successful completion of this fourth offering demonstratesthe continued confidence that Bolivian investors have in San Lucas and Santacruz. Achieving full placement in today’s market environmentunderscores the strength of our operating platform, our disciplined financial management, and our ability to consistently access localcapital. It also reflects the quality and credibility of our business model, with San Lucas playing a key strategic role in strengtheningour operations in Bolivia and supporting long-term value creation for our shareholders.”

Please refer to the Company’s news releases dated February 27, 2025, August 11, 2025 and April 9, 2026 for details of the first, second and third offerings, respectively.

* Bs refers to the Bolivian boliviano (BOB). The official Exchange Rate in Bolivia is BOB 12.08 per US$1.

AboutSantacruz Silver Mining Ltd.

Santacruz Silver is engaged in the operation, acquisition, exploration, and development of mineral properties across Latin America. In Bolivia, the Company operates the Bolivar, Porco, and Caballo Blanco mining complexes, with Caballo Blanco comprising the Tres Amigos and Colquechaquita mines. The Reserva mine, whose production is provided to the San Lucas ore sourcing and trading business, is also located in Bolivia. Additionally, the Company oversees the Soracaya exploration project. In Mexico, Santacruz operates the Zimapan mine.

‘signed’

Arturo Préstamo Elizondo,

Executive Chairman and CEO

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For further information, please contact:

Arturo Préstamo

Santacruz Silver Mining Ltd.

Email: [email protected]

Telephone: +52 81 83 785707

Andrés Bedregal

Santacruz Silver Mining Ltd.

Email: [email protected]

Telephone: +591 22444849

Eduardo Torrecillas

Santacruz Silver Mining Ltd.

Email: [email protected]

Telephone: +591 22444849

Neitherthe TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) northe Nasdaq Capital Market LLC accepts responsibility for the adequacy or accuracy of this news release. No stock exchange, securitiescommission or other regulatory authority has approved or disapproved the information contained herein.

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