NexGen's Final Batch of 2025 Assays Return Multiple High-Grade Intercepts

Confirming Both Expansion and Continuity of Primary High-Grade Subdomain and Confirmation of New High-Grade Subdomain at Depth Highlights: RK-25-239 returns 13.0 m at 5.2% U3O8, including 0.5 m at 30.2% U3O8 confirming expansion of the growing high-grade subdomain 33 m up dip of RK-25-232 (15.0 m at 15.9% U3O8) RK-25-240 returns 10.0 m at 3.95% U3O8, including 0.5 m at 33.3% U3O8 in the down dip portion of the high-grade subdomain 266 m below RK-25-232 Assays from RK-25-230 (7.5 m at 5.3% U3O8 including 0.5 m at 35.9% U3O8), RK-25-233 (6.0 m at 2.4% U3O8 including 0.5 m at 23.4% U3O8), RK-25-236 (5.5 m at 2.3% U3O8 including 0.5 m at 13.3% U3O8) confirm continuity of high-grade subdomain; 47 m, 151 m, and 40 m respectively from RK-25-232 Confirmed the new high-grade subdomain, at 850 m below surface with RK-25-257 returning 4.5 m at 4.8% U3O8 including 0.5 m at 33.3% U3O8 located 67 m up dip of RK-24-202 (0.5 m at 6.9% U3O8). Confirms significant growth potential. Vancouver, British Columbia--(Newsfile Corp. - May 7, 2026) - NexGen Energy Ltd. (TSX: NXE) (NYSE: NXE) (ASX: NXG) ("NexGen" or the "Company") announces the final receipt of 2025 assay results that highlight the expansion and continuity of the high-grade subdomain at the Company's 100% owned Patterson Corridor East (PCE) discovery located 3.5 km from the Arrow Deposit. The expansion of the high-grade subdomain is especially confirmed by RK-25-239 which returned 13.0 m at 5.2% U3O8, including 0.5 m at 30.2% U3O8, at 400 m below surface and RK-25-240 which returned 10.0 m at 3.95% U3O8, including 0.5 m at 33.3% U3O8, at 670 m below surface. Both of these holes share strong similarities with respect to their overall geological characteristics which span across 292 m of mineralized dip extent. (Figures 1-3, Table 1). Results from RK-25-240 emphasize the potential extension of mineralization at depth where the system is open. Together with these results, the grades from RK-25-230 (Figure 4), RK-25-233, RK-25-236 have confirmed a strong core zone within the high-grade subdomain which remains open in most directions. Within the overall mineralized footprint, a new secondary high-grade subdomain is now confirmed by RK-25-257 (Figures 1 and 5). This hole has several intercepts with the best being 4.5 m at 4.8% U3O8 including 0.5 m at 33.3% U3O8 located 67 m up dip of RK-24-202 (0.5 m at 6.9% U3O8). This new subdomain has high prospectivity for continued growth and is open in most directions. Exploration drilling in 2026 has already driven further growth at PCE with the majority of the campaign (29,241.8 m of the planned 42,000 m) scheduled to recommence the week of May 25, 2026 (see news release April 22, 2026). All samples from 2026 drilling to date are submitted to the independent Saskatchewan Research Council Geoanalytical Laboratory (SRC), with results to follow. Leigh Curyer, Founder & Chief Executive Officer, commented: "These assay results from 2025 drilling confirm high-grade mineralization and the expanding scale of PCE. The combination of high-grades, continuity, scale and geotechnical characteristics continue to highlight the similarities between PCE and the mighty Arrow Deposit. The opening up of a new high-grade subdomain emphasizes significant growth potential remains at PCE. With the structural supply deficit in the market widening, and the impacts of the industry wide underinvestment in the uranium supply chain for a generation, the urgency of finding and bringing online new, reliable uranium supply has never been greater. As the Rook I Project enters into major construction this summer, we continue to advance PCE to ensure that NexGen optimizes its unparalleled opportunity to become one of the world's most important mining company in delivering energy fuel for the current and future generations." Figure 1: Interpreted PCE long section (as of April 22, 2026 release) with notable assays collected since discovery and new results outlined in red; view is a long section that looks perpendicular to the primary mineralized plane; total mineralized footprint in orange and the high-grade subdomains in red To view an enhanced version of this graphic, please visit: https://images.newsfilecorp.com/files/1745/296430_b77e710374b1785f_002full.jpg Figure 2: Core photo of assays from RK-25-239 with grades shown as % U3O8 To view an enhanced version of this graphic, please visit: https://images.newsfilecorp.com/files/1745/296430_b77e710374b1785f_003full.jpg Figure 3: Core photo of assays from RK-25-240 with grades shown as % U3O8 To view an enhanced version of this graphic, please visit: https://images.newsfilecorp.com/files/1745/296430_b77e710374b1785f_004full.jpg Figure 4: Core photo of assays from RK-25-230 with grades shown as % U3O8 To view an enhanced version of this graphic, please visit: https://images.newsfilecorp.com/files/1745/296430_b77e710374b1785f_005full.jpg Figure 5: Core photo of assays from RK-25-257 highlighting the new subdomain with grades shown as % U3O8 To view an enhanced version of this graphic, please visit: https://images.newsfilecorp.com/files/1745/296430_b77e710374b1785f_006full.jpg Table 1: Assays received since December 1, 2025 news release Drillhole Unconformity Depth (m) SRC Geoanalytical Results (Cutoff 0.01%) Hole ID Azimuth Dip Total Depth (m) From (m) To (m) Width (m) U3O8 (wt%) RK-25-210c1 310 -70 894.0 - 794 794.5 0.5 0.01 801.5 803.5 2 1.00 incl. 801.5 802.5 1 1.92 804 807 3 0.04 811 812 1 0.09 812.5 814 1.5 0.15 814.5 815 0.5 0.03 817.5 818 0.5 0.07 819.5 820.5 1 0.13 821 822 1 0.48 824.5 825 0.5 0.08 RK-25-210c2 310 -70 909.0 - 811.5 813.5 2 0.14 814 815 1 0.13 816.5 817.5 1 0.06 818 818.5 0.5 0.01 819 819.5 0.5 0.03 821.5 825 3.5 0.61 incl. 822 822.5 0.5 2.97 841 842 1 0.05 852.5 853 0.5 0.03 868.5 869 0.5 0.03 887.5 888.5 1 0.01 RK-25-229 350 -70 681.4 113.2 570.5 572 1.5 0.04 573 574 1 0.02 574.5 575 0.5 0.01 576.5 579 2.5 0.04 582 582.5 0.5 0.02 604 604.5 0.5 0.03 606.5 608 1.5 0.57 incl. 606.5 607 0.5 1.62 623 623.5 0.5 0.15 636.5 637 0.5 0.24 RK-25-230 330 -70 598 112.5 441.5 444 2.5 0.20 446.5 449 2.5 0.06 450 451.5 1.5 0.01 452.5 453 0.5 0.02 456 456.5 0.5 0.02 457 459 2 0.03 459.5 460 0.5 0.02 462.5 463.5 1 0.01 467 468 1 0.02 469 469.5 0.5 0.02 471.5 472 0.5 0.01 473 474 1 0.01 475 490.5 15.5 0.25 492.5 500 7.5 5.32 incl. 493 493.5 0.5 35.9 incl. 498.5 499 0.5 27.4 511 511.5 0.5 0.02 512 513 1 0.03 513.5 514 0.5 0.03 517.5 519.5 2 0.04 520 521.5 1.5 0.05 525 526.5 1.5 0.02 532 533.5 1.5 0.01 537.5 538.5 1 0.06 539.5 540 0.5 0.05 588.5 589 0.5 0.02 RK-25-233 330 -70 694 109.7 539 540 1 0.03 555.5 558 2.5 0.02 558.5 559 0.5 0.02 560.5 568.5 8 0.04 569 570.5 1.5 0.02 571 572 1 0.11 572.5 573 0.5 0.03 574.5 575.5 1 0.02 576 582 6 2.42 incl. 578 580 2 6.98 incl. 578.5 579 0.5 23.4 582.5 589.5 7 1.59 incl. 586 588 2 4.70 590 596 6 0.08 602 602.5 0.5 0.04 603.5 609.5 6 0.53 incl. 604 605 1 2.35 624.5 625.5 1 0.11 628 628.5 0.5 0.06 629.5 630.5 1 0.04 633 633.5 0.5 0.02 634 636 2 0.36 incl. 635.5 636 0.5 1.04 RK-25-235 270 -70 858 105.5 No significant intersections RK-25-236 267 -65 541 129 376.5 380 3.5 0.04 380.5 382 1.5 0.29 393.5 394 0.5 0.02 395 397.5 2.5 0.07 401 403 2 0.44 411 414 3 0.03 414.5 415 0.5 0.03 425.5 426 0.5 0.02 427 430 3 0.03 431 431.5 0.5 0.01 433 433.5 0.5 0.01 440 440.5 0.5 0.03 441.5 442.5 1 0.01 445 445.5 0.5 0.02 447 447.5 0.5 0.01 457.5 460.5 3 0.07 461.5 462.5 1 0.09 464 464.5 0.5 0.01 465 470.5 5.5 2.34 incl. 467.5 468.5 1 10.7 incl. 467.5 468 0.5 13.3 475.5 477 1.5 0.02 477.5 479 1.5 0.05 516 517.5 1.5 0.02 RK-25-239 278 -68 594 123.4 364.5 366 1.5 0.02 367.5 368.5 1 0.02 390.5 392.5 2 0.06 393 397 4 0.06 397.5 399 1.5 0.06 400.5 401 0.5 0.03 402 402.5 0.5 0.01 407 410.5 3.5 0.41 incl. 407.5 408 0.5 1.54 411 411.5 0.5 0.01 414 415 1 0.08 416.5 417 0.5 0.01 417.5 418.5 1 0.01 419 420.5 1.5 0.04 421 421.5 0.5 0.04 422.5 423 0.5 0.02 424.5 425 0.5 0.01 426 426.5 0.5 0.01 429 429.5 0.5 0.02 430 431.5 1.5 0.03 433 446 13 5.21 incl. 438 441.5 3.5 14.4 incl. 441 441.5 0.5 30.2 448 449 1 0.01 449.5 450.5 1 0.06 451 452.5 1.5 0.15 454.5 455 0.5 0.01 456.5 457 0.5 0.05 463.5 464.5 1 0.01 466.5 467.5 1 0.02 468.5 469 0.5 0.01 469.5 470 0.5 0.02 471 473.5 2.5 0.40 incl. 472 472.5 0.5 1.28 476 477 1 0.02 478 479.5 1.5 0.30 482.5 483 0.5 0.03 484 485 1 0.04 486.5 488 1.5 0.42 490.5 491.5 1 4.58 494.5 495 0.5 0.01 497.5 500 2.5 0.10 501 501.5 0.5 0.02 502 503 1 0.02 503.5 504.5 1 2.69 505 506 1 0.04 507.5 508.5 1 0.78 incl. 508 508.5 0.5 1.32 509.5 510 0.5 0.02 514.5 515 0.5 0.08 518 520 2 0.06 RK-25-240 270 -70 893 106.1 653.5 654.5 1 0.02 659 659.5 0.5 0.01 660 669.5 9.5 0.76 incl. 664 665 1 1.99 incl. 665.5 666 0.5 6.40 incl. 668 668.5 0.5 2.10 670 671 1 0.40 671.5 672.5 1 0.13 673 674 1 1.00 675 679.5 4.5 0.27 incl. 675 675.5 0.5 1.21 680 683 3 0.09 683.5 693.5 10 3.95 incl. 685 686 1 32.7 694.5 704 9.5 0.08 705.5 707 1.5 0.08 714.5 715 0.5 0.85 717.5 718 0.5 0.07 718.5 719 0.5 0.02 726.5 727 0.5 0.02 729.5 730.5 1 0.03 732.5 734 1.5 1.50 734.5 736.5 2 0.51 737 742.5 5.5 0.37 incl. 738 738.5 0.5 1.87 750 750.5 0.5 0.02 752 753 1 0.06 755 756 1 0.03 756.5 757 0.5 0.04 757.5 758 0.5 0.01 760 766 6 0.14 766.5 767.5 1 0.10 774 776 2 0.30 776.5 777 0.5 0.12 778 779 1 0.02 780 781 1 0.73 798.5 799 0.5 0.26 804 804.5 0.5 0.02 RK-25-243 276 -66 579 126.8 365 369.5 4.5 0.78 incl. 368 369 1 3.01 371 373.5 2.5 0.08 374 374.5 0.5 0.04 375 376 1 0.01 376.5 377 0.5 0.11 382.5 383.5 1 0.02 384.5 388.5 4 0.11 400.5 401 0.5 0.01 402.5 403 0.5 0.03 403.5 404 0.5 0.02 404.5 408 3.5 0.04 409 413 4 0.17 413.5 414.5 1 0.02 416 420.5 4.5 0.07 421 423 2 0.03 423.5 427 3.5 0.48 incl. 426 426.5 0.5 1.43 427.5 428 0.5 0.02 429.5 430 0.5 0.16 432 435 3 0.05 435.5 437 1.5 0.74 incl. 435.5 436 0.5 2.06 446.5 447 0.5 0.03 452 454.5 2.5 0.04 455.5 457 1.5 0.02 458.5 461 2.5 0.02 471.5 474.5 3 0.10 475 475.5 0.5 0.01 476.5 477 0.5 0.03 480 482.5 2.5 0.27 488 491 3 0.24 491.5 492 0.5 0.02 503 503.5 0.5 0.12 RK-25-247 330 -70 738.0 114.4 571 584.5 13.5 0.39 incl. 577.5 578 0.5 3.20 581.5 582 0.5 3.29 585 585.5 0.5 0.02 586 590.5 4.5 0.05 591 600.5 9.5 0.39 incl. 593.5 594.5 1 1.91 601 609 8 0.13 610 610.5 0.5 0.04 611 612 1 0.03 613.5 614.5 1 0.03 RK-25-248 283 -69 501.0 123.3 339 339.5 0.5 0.03 340.5 341.5 1 0.01 342 342.5 0.5 0.03 343.5 344.5 1 0.02 346.5 347 0.5 0.03 348 348.5 0.5 0.02 350 353.5 3.5 0.03 354.5 355 0.5 0.01 356.5 359.5 3 0.04 360.5 361.5 1 0.02 365.5 369 3.5 0.02 371 373 2 0.02 377 378 1 0.02 381.5 384 2.5 0.06 384.5 385 0.5 0.06 385.5 386.5 1 0.02 389.5 391 1.5 0.05 391.5 395 3.5 0.02 395.5 397.5 2 0.07 398 405 7 0.04 409 410.5 1.5 0.03 411 413.5 2.5 0.02 435 435.5 0.5 0.07 436 439 3 0.02 440 443.5 3.5 0.03 RK-25-249 340 -70 681.0 106.1 626.5 627 0.5 0.02 628 629.5 1.5 0.07 630.5 631.5 1 0.03 637.5 638.5 1 0.03 640.5 643.5 3 0.42 incl. 641 641.5 0.5 1.52 644.5 645 0.5 0.01 645.5 646.5 1 0.05 648 649 1 0.03 650 652.5 2.5 0.12 653 659 6 0.12 661.5 662.5 1 0.24 668.5 670.5 2 0.13 672 673 1 0.03 673.5 674 0.5 0.02 680 681 1 0.04 RK-25-250 308 -70 726.0 114.8 587 589 2 0.18 592 593.5 1.5 0.32 594 598 4 0.08 599 606 7 0.24 606.5 611.5 5 0.07 612 617 5 0.46 incl. 615 615.5 0.5 3.38 618 624.5 6.5 0.68 incl. 619.5 620 0.5 5.51 incl. 623.5 624 0.5 1.58 630 630.5 0.5 0.03 637.5 638.5 1 0.03 660.5 661 0.5 0.49 663 663.5 0.5 0.68 665 665.5 0.5 0.04 666 667 1 0.58 667.5 669.5 2 0.08 670 671.5 1.5 0.07 674.5 675 0.5 0.11 676 676.5 0.5 0.04 RK-25-251 302 -69 576.3 119.6 377 378 1 0.02 379.5 383.5 4 0.02 384 389 5 0.02 391.5 396 4.5 0.29 404.5 411.5 7 0.91 incl. 406 408.5 2.5 2.22 420 422 2 0.02 439.5 440 0.5 0.02 446 447.5 1.5 0.02 448 448.5 0.5 0.02 451.5 452.5 1 0.03 460 460.5 0.5 0.01 461 461.5 0.5 0.33 464.5 465 0.5 0.01 465.5 466 0.5 0.01 468 469 1 0.03 469.5 471 1.5 0.09 472.5 473 0.5 0.01 474.5 476 1.5 0.01 RK-25-252 275 -68 663.0 120.8 515.5 516 0.5 0.03 516.5 517 0.5 0.02 517.5 518 0.5 0.01 528 534.5 6.5 0.04 535.5 538 2.5 0.02 545 556.5 11.5 0.31 incl. 553.5 554.5 1 2.70 557 558.5 1.5 0.09 559.5 561.5 2 0.07 563 565.5 2.5 0.12 566 567.5 1.5 0.02 568 569.5 1.5 0.03 570 570.5 0.5 0.05 572 573.5 1.5 0.03 589 589.5 0.5 0.19 590 591 1 0.03 593.5 597 3.5 0.10 597.5 598 0.5 0.02 598.5 599 0.5 0.04 599.5 600 0.5 0.02 603 606.5 3.5 0.11 608.5 609.5 1 0.01 RK-25-254c1 275 -65 564.0 N/A 395.5 397 1.5 0.26 407 407.5 0.5 0.02 408 410 2 0.01 414.5 415 0.5 0.01 421.5 423.5 2 0.04 434 435.5 1.5 0.03 436 442.5 6.5 0.24 444 445.5 1.5 0.03 447.5 448 0.5 0.03 449.5 451.5 2 0.17 453 454.5 1.5 0.04 456 458 2 0.07 458.5 459 0.5 0.02 459.5 463 3.5 0.05 464 464.5 0.5 0.02 465 465.5 0.5 0.01 466 466.5 0.5 0.01 468 469.5 1.5 0.03 470 470.5 0.5 0.01 471.5 474.5 3 0.05 475.5 476 0.5 0.01 481 493.5 12.5 0.37 incl. 488.5 489 0.5 1.07 490.5 491 0.5 2.91 495.5 496.5 1 0.04 497 497.5 0.5 0.05 498.5 501 2.5 0.09 502 505.5 3.5 0.03 RK-25-254c2 275 -65 553.5 - 394 395 1 0.05 396 398 2 0.02 409.5 413.5 4 0.02 415.5 417.5 2 0.01 420.5 421 0.5 0.02 421.5 422 0.5 0.06 428.5 431 2.5 0.01 437.5 438.5 1 0.15 439.5 442 2.5 0.68 incl. 440 441 1 1.17 442.5 443.5 1 0.02 445.5 448 2.5 0.06 448.5 450 1.5 0.12 451 454.5 3.5 0.05 456 457.5 1.5 0.03 481.5 482.5 1 0.05 483 484 1 0.01 490.5 491 0.5 0.13 491.5 492 0.5 0.02 492.5 493.5 1 0.04 495.5 497 1.5 0.13 RK-25-255 4 -70 950.4 112.7 780 783 3 0.19 785.5 786 0.5 0.05 787 787.5 0.5 0.03 790 791 1 0.09 791.5 793.5 2 0.05 794.5 798.5 4 0.04 799.5 800 0.5 0.02 803.5 804.5 1 0.02 805 805.5 0.5 0.73 807 808.5 1.5 1.88 incl. 808 808.5 0.5 3.56 829.5 830.5 1 0.05 832 835 3 0.04 835.5 836.5 1 0.02 838.5 839 0.5 0.04 841 842 1 0.02 842.5 843 0.5 0.01 844 846.5 2.5 0.08 847.5 848.5 1 0.04 851.5 852.5 1 0.24 886.5 887.5 1 0.06 889 890 1 0.49 RK-25-257 337 -68 1085.0 108.1 925 925.5 0.5 0.12 938 938.5 0.5 0.07 942.5 944 1.5 2.84 incl. 943 943.5 0.5 8.46 946 946.5 0.5 0.81 948 952.5 4.5 4.83 incl. 948 948.5 0.5 33.3 955 956 1 0.03 956.5 957.5 1 0.07 958.5 959 0.5 0.06 959.5 966.5 7 0.07 967 967.5 0.5 0.01 968.5 969 0.5 0.05 992.5 998 5.5 0.31 1004 1008.5 4.5 0.11 1009.5 1010.5 1 0.32 1012 1016.5 4.5 0.71 incl. 1012.5 1014 1.5 1.94 1017 1017.5 0.5 1.03 1026.5 1030 3.5 0.98 incl. 1029 1029.5 0.5 4.95 1030.5 1031.5 1 2.01 1032.5 1034 1.5 0.20 1036 1037 1 0.13 RK-25-257c1 337 -68 1139.0 - 964.5 966 1.5 0.10 1037 1037.5 0.5 0.03 1039.5 1042.5 3 0.10 1044 1045 1 0.07 1048.5 1049 0.5 0.01 RK-25-257c2 337 -68 1104.0 - 997.5 998 0.5 0.02 998.5 999 0.5 0.01 1000.5 1001 0.5 0.04 1037 1037.5 0.5 0.04 RK-25-258 278 -67 249.0 117.9 No significant intersections RK-25-258c1 278 -67 687.0 - 499 502 3 0.11 503 503.5 0.5 0.03 504.5 505 0.5 0.02 507 509 2 0.08 518.5 519 0.5 0.01 519.5 522 2.5 0.09 531.5 532 0.5 0.01 534.5 535 0.5 0.01 536 536.5 0.5 0.05 537 540 3 0.06 543.5 544 0.5 0.01 545.5 547.5 2 0.05 548.5 556 7.5 0.47 incl. 552.5 554 1.5 1.92 556.5 565 8.5 0.74 incl. 558.5 560 1.5 2.74 incl. 560.5 561 0.5 1.13 565.5 567 1.5 1.99 incl. 566 566.5 0.5 5.91 570 570.5 0.5 0.01 573.5 574 0.5 0.03 574.5 575 0.5 0.05 628.5 630.5 2 0.07 631 632.5 1.5 0.02 633 634.5 1.5 0.15 637 637.5 0.5 0.01 642 642.5 0.5 0.02 RK-25-258c2 278 -67 667.0 - 552.5 553 0.5 0.04 571.5 575 3.5 0.07 575.5 589 13.5 0.73 incl. 577 579.5 2.5 2.22 incl. 580.5 581 0.5 2.46 incl. 586 586.5 0.5 1.27 589.5 593.5 4 0.06 594 595.5 1.5 0.09 598 599 1 0.09 601 601.5 0.5 0.07 602 609.5 7.5 0.16 618.5 622.5 4 0.02 629 629.5 0.5 0.10 630 630.5 0.5 0.16 632.5 633 0.5 0.01 RK-25-259 280 -68 609.0 118.8 461 466 5 0.07 467.5 468 0.5 0.01 471 472 1 0.08 472.5 473.5 1 0.05 474 476 2 0.20 491 492 1 0.02 522.5 524.5 2 0.09 536.5 537.5 1 1.03 incl. 537 537.5 0.5 1.90 596 597 1 0.02 RK-25-260 277 -72 879.0 111.1 612 612.5 0.5 0.03 614 614.5 0.5 0.14 RK-25-261 275 -70 456.0 - 272 283 11 0.04 284 289 5 0.07 290.5 291 0.5 0.01 292 293.5 1.5 0.02 299 299.5 0.5 0.01 300.5 302 1.5 0.03 308 308.5 0.5 0.01 311.5 312 0.5 0.02 318 318.5 0.5 0.02 321 322 1 0.01 322.5 332 9.5 0.15 incl. 327.5 328 0.5 1.49 332.5 334 1.5 0.16 340 342 2 0.08 362 363 1 0.02 RK-25-262 280 -70 567.0 119.7 416 417.5 1.5 0.01 425.5 426 0.5 0.01 433 437 4 0.06 437.5 438.5 1 0.02 440 440.5 0.5 0.01 442 443 1 0.02 444 444.5 0.5 0.01 452.5 453 0.5 0.09 455 455.5 0.5 0.02 459 459.5 0.5 0.02 460.5 461 0.5 0.01 462 463 1 0.01 463.5 465 1.5 0.15 465.5 467 1.5 0.03 470.5 471 0.5 0.03 490 493 3 0.07 493.5 495.5 2 0.08 511 512.5 1.5 0.04 RK-25-263 275 -70 474.0 - 308.5 309 0.5 0.02 309.5 310 0.5 0.02 310.5 314 3.5 0.05 314.5 315 0.5 0.08 316 316.5 0.5 0.02 356.5 358 1.5 0.03 359 360 1 0.01 RK-25-264 265 -70 390.0 123.9 260 260.5 0.5 0.01 262.5 263.5 1 0.01 264 264.5 0.5 0.01 265.5 266 0.5 0.04 RK-25-265 270 -68 627.0 119.3 511.5 512 0.5 0.02 512.5 513 0.5 0.24 RK-25-266 275 -67 543.0 123.0 431.5 433.5 2 0.19 RK-25-267 274 -68 528.0 126.4 468 468.5 0.5 0.09 470.5 471.5 1 0.02 474 474.5 0.5 0.01 475 476 1 0.01 479 480 1 0.01 482 483 1 0.01 488.5 489 0.5 0.01 RK-25-268 280 -60 429.0 135.4 245 247.5 2.5 0.02 248 249.5 1.5 0.03 250 251 1 0.06 251.5 252.5 1 0.13 253.5 255.5 2 0.13 256 258 2 0.07 258.5 259.5 1 0.03 261.5 262.5 1 0.03 263 264 1 0.05 272.5 273 0.5 0.02 274.5 275 0.5 0.01 276 278 2 0.03 285 285.5 0.5 0.03 289 290 1 0.05 290.5 291 0.5 0.02 291.5 292 0.5 0.01 293 294.5 1.5 0.07 295.5 296 0.5 0.02 299 299.5 0.5 0.01 305.5 306 0.5 0.06 RK-25-269 298 -68 820.0 109.0 670.5 671.5 1 0.03 701 703.5 2.5 0.01 709.5 710 0.5 0.12 717.5 718.5 1 0.11 724 725 1 0.16 727.5 728 0.5 0.05 731.5 735 3.5 0.50 incl. 731.5 732 0.5 1.44 735.5 736 0.5 0.02 736.5 737.5 1 0.06 738 739 1 0.16 744.5 750.5 6 0.19 753 753.5 0.5 0.05 757.5 761 3.5 0.44 incl. 758 759 1 1.35 762 764.5 2.5 0.12 765 766 1 0.03 769.5 770 0.5 0.02 771 773 2 0.17 773.5 774 0.5 0.27 776.5 777.5 1 0.07 RK-25-270 290 -65 420.0 134.8 283 283.5 0.5 0.07 RK-25-271 275 -75 744.0 115.1 587 588 1 0.03 596 597 1 0.13 597.5 599 1.5 0.04 600 601 1 0.04 610 611.5 1.5 0.23 612 616 4 0.18 617.5 619 1.5 0.09 620 629 9 0.39 incl. 625 625.5 0.5 2.55 incl. 628 628.5 0.5 1.22 629.5 632.5 3 1.62 incl. 632 632.5 0.5 3.9 633 636 3 7.01 incl. 634 635.5 1.5 13.3 incl. 635 635.5 0.5 13.8 637 638 1 1.84 incl. 637 637.5 0.5 2.69 639 640.5 1.5 1.83 incl. 640 640.5 0.5 2.71 643 644 1 0.05 647.5 648.5 1 0.04 649 652.5 3.5 0.12 653 654 1 0.05 659 660 1 0.01 664 665 1 0.29 675 675.5 0.5 0.03 676 677 1 0.02 677.5 678 0.5 0.03 681 681.5 0.5 0.12 697 697.5 0.5 0.07 705.5 706 0.5 0.03 723.5 724.5 1 0.02 RK-25-272 270 -70 685.1 119.4 509 510 1 0.02 511 513 2 0.08 521 525 4 0.13 525.5 526 0.5 0.02 529.5 537 7.5 0.51 incl. 532.5 533 0.5 3.07 incl. 535.5 536 0.5 1.72 537.5 538.5 1 0.02 539.5 540.5 1 0.05 541 542.5 1.5 0.02 543.5 547.5 4 0.03 548 554.5 6.5 0.42 incl. 550.5 551 0.5 1.37 555.5 564 8.5 0.77 incl. 557.5 558 0.5 3.81 incl. 563 563.5 0.5 5.88 565.5 566 0.5 0.01 569.5 574.5 5 0.28 incl. 571.5 572 0.5 1.22 576 578.5 2.5 0.34 582.5 585 2.5 0.05 585.5 587 1.5 0.03 All depths and intervals are meters downhole, true thicknesses are yet to be determined. Unconformity of 'N/A' denotes a lack of visible contact between Athabasca sandstone and basement rock. Maximum internal dilution 2.0 m downhole. Minimum thickness of 0.5 m downhole. Cutoff grade 0.01% U3O8. All depths and intervals are metres downhole, true thicknesses are yet to be determined. Resource modelling in conjunction with an updated mineral resource estimate is required before true thicknesses can be determined. * Denotes results that correlate to high-grade levels of radioactivity (>10,000 cps) About NexGen NexGen Energy is a Canadian company focused on delivering clean energy fuel for the future. The Company's flagship Rook I Project is being optimally developed into the largest low-cost producing uranium mine globally, incorporating the most elite environmental and social governance standards. The Rook I Project is supported by an N.I. 43-101 compliant Feasibility Study, which outlines the elite environmental performance and industry-leading economics. NexGen is led by a team of experienced uranium and mining industry professionals with expertise across the entire mining life cycle, including exploration, financing, project engineering and construction, operations and closure. NexGen is leveraging its proven experience to deliver a Project that leads the entire mining industry socially, technically and environmentally. The Project and prospective portfolio in northern Saskatchewan will provide generational, long-term economic, environmental, and social benefits for Saskatchewan, Canada, and the world. NexGen is listed on the Toronto Stock Exchange, the New York Stock Exchange under the ticker symbol "NXE," and on the Australian Securities Exchange under the ticker symbol "NXG," providing access to global investors to participate in NexGen's mission of solving three major global challenges in decarbonization, energy security and access to power. The Company is headquartered in Vancouver, British Columbia, with its primary operations office in Saskatoon, Saskatchewan. Technical Disclosure* All technical information in this news release has been reviewed and approved by Jason Craven, NexGen's Vice President, Exploration, a qualified person under National Instrument 43-101. Natural gamma radiation in drill core reported in this news release was measured in counts per second (cps) using a Radiation Solutions Inc. RS-125 gamma spectrometer. The reader is cautioned that total count gamma readings may not be directly or uniformly related to uranium grades of the rock sample measured; they should be used only as a preliminary indication of the presence of radioactive minerals. A technical report in respect of the FS is filed on SEDAR+ (www.sedarplus.ca) and EDGAR (www.sec.gov/edgar.shtml) and is available for review on NexGen Energy's website (www.nexgenenergy.ca). Cautionary Note to U.S. Investors This news release includes Mineral Reserves and Mineral Resources classification terms that comply with reporting standards in Canada and the Mineral Reserves and the Mineral Resources estimates are made in accordance with NI 43-101. 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. These standards differ from the requirements of the Securities and Exchange Commission ("SEC") set by the SEC's rules that are applicable to domestic United States reporting companies. Consequently, Mineral Reserves and Mineral Resources information included in this news release is not comparable to similar information that would generally be disclosed by domestic U.S. reporting companies subject to the reporting and disclosure requirements of the SEC Accordingly, information concerning mineral deposits set forth herein may not be comparable with information made public by companies that report in accordance with U.S. standards. Forward-Looking Information The information contained herein contains "forward-looking statements" within the meaning of applicable United States securities laws and regulations and "forward-looking information" within the meaning of applicable Canadian securities legislation. "Forward-looking information" includes, but is not limited to, statements with respect to mineral reserve and mineral resource estimates, the 2021 Arrow Deposit, Rook I Project and estimates of uranium production, grade and long-term average uranium prices, anticipated effects of completed drill results on the Rook I Project, planned work programs, completion of further site investigations and engineering work to support basic engineering of the project and expected outcomes. Generally, but not always, forward-looking information and statements can be identified by the use of words such as "plans", "expects", "is expected", "budget", "scheduled", "estimates", "forecasts", "intends", "anticipates", or "believes" or the negative connotation thereof or variations of such words and phrases or state that certain actions, events or results "may", "could", "would", "might" or "will be taken", "occur" or "be achieved" or the negative connotation thereof. Statements relating to "mineral resources" are deemed to be forward-looking information, as they involve the implied assessment that, based on certain estimates and assumptions, the mineral resources described can be profitably produced in the future. Forward-looking information and statements are based on the then current expectations, beliefs, assumptions, estimates and forecasts about NexGen's business and the industry and markets in which it operates. Forward-looking information and statements are made based upon numerous assumptions, including among others, that the mineral reserve and resources estimates and the key assumptions and parameters on which such estimates are based are as set out in this news release and the technical report for the property , the results of planned exploration activities are as anticipated, the price and market supply of uranium, the cost of planned exploration activities, that financing will be available if and when needed and on reasonable terms, that third party contractors, equipment, supplies and governmental and other approvals required to conduct NexGen's planned exploration activities will be available on reasonable terms and in a timely manner and that general business and economic conditions will not change in a material adverse manner. Although the assumptions made by the Company in providing forward looking information or making forward looking statements are considered reasonable by management at the time, there can be no assurance that such assumptions will prove to be accurate in the future. Forward-looking information and statements also involve known and unknown risks and uncertainties and other factors, which may cause actual results, performances and achievements of NexGen to differ materially from any projections of results, performances and achievements of NexGen expressed or implied by such forward-looking information or statements, including, among others, the existence of negative operating cash flow and dependence on third party financing, uncertainty of the availability of additional financing, the risk that pending assay results will not confirm previously announced preliminary results, conclusions of economic valuations, the risk that actual results of exploration activities will be different than anticipated, the cost of labour, equipment or materials will increase more than expected, that the future price of uranium will decline or otherwise not rise to an economic level, the appeal of alternate sources of energy to uranium-produced energy, that the Canadian dollar will strengthen against the U.S. dollar, that mineral resources and reserves are not as estimated, that actual costs or actual results of reclamation activities are greater than expected, that changes in project parameters and plans continue to be refined and may result in increased costs, of unexpected variations in mineral resources and reserves, grade or recovery rates or other risks generally associated with mining, unanticipated delays in obtaining governmental, regulatory or First Nations approvals, risks related to First Nations title and consultation, reliance upon key management and other personnel, deficiencies in the Company's title to its properties, uninsurable risks, failure to manage conflicts of interest, failure to obtain or maintain required permits and licences, risks related to changes in laws, regulations, policy and public perception, as well as those factors or other risks as more fully described in NexGen's Annual Information Form dated March 6, 2024 filed with the securities commissions of all of the provinces of Canada except Quebec and in NexGen's 40-F filed with the United States Securities and Exchange Commission, which are available on SEDAR+ at www.sedarplus.ca and Edgar at www.sec.gov. Although the Company has attempted to identify important factors that could cause actual results to differ materially from those contained in the forward-looking information or statements or implied by forward-looking information or statements, there may be other factors that cause results not to be as anticipated, estimated or intended. Readers are cautioned not to place undue reliance on forward-looking information or statements due to the inherent uncertainty thereof. There can be no assurance that forward-looking information and statements will prove to be accurate, as actual results and future events could differ materially from those anticipated, estimated or intended. Accordingly, readers should not place undue reliance on forward-looking statements or information. The Company undertakes no obligation to update or reissue forward-looking information as a result of new information or events except as required by applicable securities laws. To view the source version of this press release, please visit https://www.newsfilecorp.com/release/296430 SOURCE NexGen Energy Ltd.