NexGen Expands High-Grade Subdomain Vertical Extent by 17% to 644 m and Intersects Continuous Strong Mineralization Across Patterson Corridor East (PCE) while Adding Fifth Drill to Advance Optimally

Highlights: Vertical extent of high-grade subdomain increased by 94 m to 644 m with RK-26-293 intersecting cumulative 4.7 m of >10,000 cps, including 0.1 m of >61,000 cps at 930 m depth. Down plunge test hole, RK-26-290c1, intersected multiple stacked uranium veins across 40 m of the high-grade subdomain intersecting cumulative 19.5 m of >10,000 cps including 12.9 m of >10,000 cps that surrounds 5.2 m of >61,000 cps. Internal continuity strong throughout highlighted by RK-26-294 intersecting cumulative 6.9 m of >10,000 cps including 3.1 m of >61,000 cps located 27 m up dip of RK-24-222 (17.0 m at 3.85% U3O8). Holes RK-26-290c1 and RK-26-294 represent the two best holes for 2026 to date, and rank as the best and third best holes, based on cumulative >61,000 cps, intersected at PCE since discovery. Additionally, the up dip high-grade subdomain expanded by 50 m in RK-26-296 that returned cumulative 3.5 m of >10,000 cps including 0.4 m of >61,000 cps. NexGen adding a fifth drill rig to continue to advance PCE optimally. Vancouver, British Columbia--(Newsfile Corp. - August 25, 2026) - NexGen Energy Ltd. (TSX: NXE) (NYSE: NXE) (ASX: NXG) ("NexGen" or the "Company") announces results from the early portion of 2026 summer drilling at PCE which expanded the high-grade subdomain both up and down dip while continuing to demonstrate strong internal continuity of intense high-grade mineralization (Figures 1 and 2, Table 1). High-grade uranium mineralization now extends to 930 m with hole RK-26-293 intersecting cumulative 4.7 m of >10,000 cps including 0.1 m of >61,000 cps. This hole expanded the vertical extent by 94 m, a 17% increase to 644 m. This zone of intense mineralization is accompanied by strong, broad hydrothermal alteration with notable potential for additional mineralized continuation nearby and below (Figures 1 and 2). The strike extent remains at 210 m as recent tests primarily focused on confirmation of deep-seated interpretations. RK-26-290c1 designed as a down-plunge test in hole delivered a dual purpose as a test across the full extent of the previous known mineralized footprint of PCE in order to understand the geometry, continuity and extents of high-grade zones within the overall mineralization. This hole intersected multiple stacked uranium veins across 40 m of the high-grade subdomain with cumulative 19.5 m of >10,000 cps including 12.9 m of >10,000 cps that surrounds 5.2 m of >61,000 cps. This is the best hole to date at PCE based on >61,000 cps. Advancement of the model was optimized with confirmation of interpretations as well as critical identification of repeating, mineralization-controlling structural disruptions. RK-26-294 delivered confirmation of strong internal continuity of intense mineralization intersecting cumulative 6.9 m of >10,000 cps including 3.1 m of >61,000 cps located 27 m along strike of RK-24-222 (17.0 m at 3.85% U3O8) (Figures 1 to 4). Together with RK-26-290c1, these holes combined represent the two best holes drilled to date in 2026. Additional new drilling shown in Figures 1 and 2, and Table 1, tested the mineralized extents and key areas within the high-grade subdomain. These holes provided crucial geological orientation information that influences extents of the model, in particular the high-grade component. An example being RK-26-296 with cumulative 3.5 m of >10,000 cps including 0.4 m of >61,000 cps that expanded the shallowest portion of PCE by 50 m along strike. Overall, the bulk of high-grade subdomain mineralization at PCE is 70 m shallower than the A2 High-Grade (HG) Zone. Jason Craven, Vice President of Exploration, commented: "Growth of the high-grade subdomain continues to exceed expectations with expansions across the areas of focus with mineralization still open in most directions. Establishing clear connectivity between intense high-grade intersections with RK-26-290c1 and RK-26-294, which both hit broad zones of intense uranium mineralization is a material advancement of this discovery. In addition, RK-26-293 is extremely exciting as it has expanded the high-grade subdomain by 94 m and opened this area up for potential high-impact growth of this high-grade mineralization." Leigh Curyer, Chief Executive Officer, commented: "Given today's results at PCE, the team is adding a fifth drill rig for the remainder of the 2026 program. In parallel, with construction of the Rook I Project, the team is delivering on multiple fronts and simultaneously expanding the long-term growth profile of NexGen as a world leader in the provision of this key energy fuel." Drilling at PCE recommenced on May 28, 2026 and to date in 2026 a total of 20,138.7 m has been completed of the planned 42,000 m, focusing on high-grade growth and expansion of mineralization. Eleven drillholes this summer totalling 7,425.2 m have further tested the mineralization at PCE. NexGen has added a fifth drill rig to continue to advance this uranium discovery optimally. Additional tests of the parallel trend at PCE are planned as part of the remainder of summer drilling. Samples from 2026 drilling are continuously submitted to the independent Saskatchewan Research Council Geoanalytical Laboratory (SRC), with results to follow. Figure 1: Interpreted 3D model of PCE shown looking northwest (across strike) and northeast (along strike); RK-26-290c1, RK-26-293, and RK-26-294 intersections outlined in purple; mineralization remains open, particularly below entire high-grade subdomain To view an enhanced version of this graphic, please visit: https://images.newsfilecorp.com/files/1745/311333_8e4d6703f4ec78d1_001full.jpg Figure 2: Interpreted model of mineralization at PCE (as of this release); new holes emphasized by larger diameter pierce points and bold labels with the trace of down plunge test in dashed black; 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/1745/311333_8e4d6703f4ec78d1_002full.jpg Figure 3: Core photo from RK-26-294 displays cumulative 3.1 m of off-scale (>61,000 cps) uranium mineralization between 656.9 and 665.4 m down hole; yellow outlines >1,000 cps, red outlines >10,000 cps, >61,000 cps outlined in purple To view an enhanced version of this graphic, please visit: https://images.newsfilecorp.com/files/1745/311333_8e4d6703f4ec78d1_003full.jpg Figure 4: Core photo from RK-26-290c1 displays cumulative 5.2 m of off-scale (>61,000 cps) uranium mineralization between 451.4 and 491.4 m down hole; yellow outlines >1,000 cps, red outlines >10,000 cps, >61,000 cps outlined in purple To view an enhanced version of this graphic, please visit: https://images.newsfilecorp.com/files/1745/311333_8e4d6703f4ec78d1_004full.jpg Table 1: Spectrometer results since April 22, 2026 release Drillhole Unconformity Depth (m) Handheld Spectrometer Results (RS-125) Hole ID Azimuth Dip Total Depth (m) From (m) To (m) Width (m) CPS Range RK-26-285c1 275 -72 858 N/A 791.5 792.0 0.5 <500 - 670 794.5 795.0 0.5 <500 796.0 797.0 1.0 <500 797.0 797.5 0.5 5600 - 41000 797.5 797.6 0.1 11000 - 31000 797.6 797.7 0.1 >61000 797.7 798.0 0.3 11000 - 31000 798.0 798.5 0.5 1400 - 4160 798.5 799.0 0.5 800 - 4200 799.0 799.5 0.5 <500 - 570 799.5 800.0 0.5 <500 - 1250 800.0 800.5 0.5 1150 - 3980 800.5 801.0 0.5 680 - 1110 801.0 801.5 0.5 <500 - 1120 801.5 802.0 0.5 510 - 780 802.0 802.5 0.5 <500 - 1500 802.5 803.0 0.5 <500 - 530 803.0 803.5 0.5 <500 - 530 803.5 804.0 0.5 800 - 3250 804.0 804.5 0.5 860 - 4020 804.5 805.0 0.5 770 - 2120 805.0 805.5 0.5 870 - 2140 805.5 806.0 0.5 <500 - 2560 806.0 806.5 0.5 910 - 2660 806.5 807.0 0.5 <500 - 4700 807.0 807.5 0.5 <500 - 670 807.5 808.0 0.5 <500 - 4730 808.0 808.5 0.5 <500 - 7210 808.5 809.0 0.5 3700 - 10000 809.0 809.5 0.5 920 - 4450 810.0 810.5 0.5 <500 810.5 811.0 0.5 <500 - 640 811.0 811.5 0.5 510 - 1080 811.5 812.5 1.0 <500 812.5 813.0 0.5 <500 - 1850 813.0 813.5 0.5 <500 823.0 823.5 0.5 <500 - 2550 RK-26-290 59 -75 519 N/A 338.0 338.5 0.5 <500 - 710 338.5 339.0 0.5 <500 - 700 346.0 346.5 0.5 <500 346.5 347.0 0.5 <500 - 900 347.0 347.5 0.5 <500 - 960 353.5 354.0 0.5 <500 355.0 356.0 1.0 <500 356.0 356.5 0.5 <500 - 750 356.5 357.0 0.5 <500 - 780 357.0 357.5 0.5 <500 - 530 357.5 358.0 0.5 <500 - 620 358.0 358.5 0.5 1000 - 3300 358.5 359.0 0.5 <500 - 940 359.0 359.5 0.5 <500 - 1400 360.0 360.5 0.5 <500 - 1100 360.5 361.0 0.5 1030 - 11000 361.0 361.5 0.5 <500 - 1250 362.5 363.0 0.5 <500 363.0 363.5 0.5 <500 - 1100 363.5 364.0 0.5 <500 - 880 364.0 364.5 0.5 <500 364.5 365.0 0.5 <500 - 1080 365.0 365.5 0.5 870 - 3500 365.5 366.0 0.5 630 - 1570 366.0 366.5 0.5 850 - 1750 366.5 367.0 0.5 630 - 2770 367.0 367.5 0.5 <500 - 5300 367.5 368.0 0.5 <500 - 810 368.0 369.0 1.0 <500 369.0 369.5 0.5 <500 - 890 369.5 370.0 0.5 <500 - 770 370.0 370.5 0.5 <500 - 530 371.5 372.0 0.5 <500 372.0 372.5 0.5 <500 - 1020 372.5 374.5 2.0 <500 378.5 379.0 0.5 <500 - 1800 379.0 379.5 0.5 <500 - 2040 379.5 380.0 0.5 <500 - 510 380.0 380.5 0.5 <500 - 550 381.0 381.5 0.5 <500 - 680 382.0 383.0 1.0 <500 383.0 383.5 0.5 <500 - 860 383.5 384.0 0.5 <500 384.0 384.5 0.5 <500 - 540 384.5 385.0 0.5 <500 387.5 388.5 1.0 <500 389.0 385.5 0.5 <500 392.5 393.0 0.5 <500 - 1160 393.0 393.5 0.5 <500 395.5 396.0 0.5 <500 397.0 397.5 0.5 <500 - 660 397.5 398.0 0.5 <500 404.5 405.0 0.5 <500 406.0 406.5 0.5 <500 414.0 414.5 0.5 <500 - 770 414.5 415.5 1.0 <500 416.0 416.5 0.5 <500 416.5 417.0 0.5 <500 - 640 417.0 417.5 0.5 <500 417.5 418.0 0.5 <500 - 620 418.0 418.5 0.5 <500 - 760 418.5 419.0 0.5 <500 419.0 419.5 0.5 <500 - 920 419.5 420.5 1.0 <500 427.0 427.5 0.5 <500 428.0 429.0 1.0 <500 429.5 430.0 0.5 <500 - 680 430.0 430.5 0.5 590 - 3140 430.5 431.0 0.5 <500 - 1770 431.0 432.5 1.5 <500 433.0 434.5 1.5 <500 435.5 436.0 0.5 <500 436.0 436.5 0.5 <500 - 760 436.5 437.0 0.5 <500 - 930 444.5 445.0 0.5 <500 - 640 445.0 445.5 0.5 <500 - 730 445.5 446.5 1.0 <500 447.0 447.5 0.5 <500 - 720 447.5 448.0 0.5 <500 - 1190 448.0 448.5 0.5 <500 - 3050 448.5 449.5 1.0 <500 450.5 451.0 0.5 <500 451.0 451.5 0.5 <500 - 690 451.5 452.0 0.5 <500 453.0 453.5 0.5 <500 462.5 463.0 0.5 <500 465.5 466.0 0.5 <500 466.0 466.5 0.5 <500 - 1420 466.5 467.0 0.5 <500 - 1220 481.0 481.5 0.5 <500 RK-26-290c1 61 -74 1242 N/A 334.5 335.0 0.5 <500 335.5 336.0 0.5 <500 342.0 342.5 0.5 600 - 1500 342.5 343.0 0.5 <500 - 600 343.0 343.5 0.5 <500 - 600 343.5 344.5 1.0 <500 344.5 345.0 0.5 1000 - 7000 345.0 345.5 0.5 <500 - 600 345.5 346.0 0.5 1000 - 10000 346.0 346.5 0.5 700 - 5000 346.5 347.0 0.5 <500 - 2200 349.5 350.0 0.5 <500 350.0 350.5 0.5 <500 - 600 350.5 351.0 0.5 <500 - 700 351.0 351.5 0.5 <500 - 700 354.5 355.0 0.5 <500 355.5 356.5 1.0 <500 357.5 359.0 1.5 <500 359.0 359.5 0.5 700 - 1400 359.5 360.0 0.5 1000 - 6000 360.0 360.5 0.5 500 - 10000 360.5 362.0 1.5 <500 362.0 362.5 0.5 <500 - 700 363.0 363.5 0.5 <500 - 1800 364.0 364.5 0.5 <500 - 600 364.5 365.0 0.5 <500 365.5 366.5 1.0 <500 367.0 368.5 1.5 <500 368.5 369.0 0.5 <500 - 800 369.0 369.5 0.5 500 - 750 369.5 370.0 0.5 <500 371.0 373.0 2.0 <500 375.0 375.5 0.5 <500 376.5 377.5 1.0 <500 378.0 379.5 1.5 <500 408.0 408.5 0.5 <500 426.5 427.0 0.5 <500 - 1200 429.5 430.0 0.5 <500 - 12100 430.0 430.5 0.5 <500 430.5 431.0 0.5 <500 - 620 431.0 432.0 1.0 <500 432.0 432.5 0.5 <500 - 710 432.5 433.0 0.5 <500 - 910 433.0 433.5 0.5 <500 - 580 440.0 441.0 1.0 <500 445.0 445.5 0.5 <500 447.0 447.5 0.5 <500 448.0 449.0 1.0 <500 449.0 449.5 0.5 <500 - 600 449.5 450.0 0.5 <500 450.5 451.0 0.5 <500 - 700 451.5 452.0 0.5 <500 - 8000 452.0 452.5 0.5 9000 - 35400 452.5 452.7 0.2 >61000 452.7 453.0 0.3 8000 - 11000 453.0 454.1 1.1 >61000 454.1 454.5 0.4 5000 - 51000 454.5 455.0 0.5 500 - 1800 455.0 455.5 0.5 2600 - 5200 455.5 456.0 0.5 1200 - 16100 456.0 456.5 0.5 1300 - 22500 456.5 457.0 0.5 6200 - 17500 457.0 457.5 0.5 7000 - 40000 457.5 458.0 0.5 8000 - 29000 458.0 458.5 0.5 5000 - 26000 458.5 459.0 0.5 1900 - 14800 459.0 459.5 0.5 1400 - 6200 459.5 460.0 0.5 1600 - 8300 460.0 460.5 0.5 2100 - 7900 460.5 461.0 0.5 600 - 17400 461.0 461.5 0.5 2100 - 21100 461.5 462.0 0.5 500 - 3900 462.0 462.5 0.5 2100 - 6800 462.5 463.0 0.5 <500 - 580 463.0 463.5 0.5 800 - 2600 463.5 464.5 1.0 <500 464.5 465.0 0.5 <500 - 600 465.0 465.5 0.5 <500 - 1600 465.5 466.0 0.5 2100 - 16100 466.0 466.5 0.5 1200 - 4500 466.5 467.0 0.5 2100 - 5300 467.0 467.5 0.5 2700 - 5100 467.5 468.0 0.5 <500 - 1300 468.0 468.5 0.5 <500 - 1100 468.5 469.0 0.5 <500 - 1200 469.0 469.5 0.5 700 - 7100 469.5 470.0 0.5 <500 - 1300 470.0 470.5 0.5 <500 470.5 471.0 0.5 1500 - 6500 471.0 471.5 0.5 <500 - 12300 471.5 473.6 2.1 >61000 473.6 474.0 0.4 1400 - 14000 474.0 474.5 0.5 <500 474.5 475.0 0.5 <500 - 4100 475.0 475.5 0.5 <500 475.5 476.0 0.5 <500 - 700 476.0 476.5 0.5 <500 476.5 477.0 0.5 <500 - 14400 477.0 477.5 0.5 <500 - 5100 477.5 478.0 0.5 <500 - 21000 478.0 478.5 0.5 <500 478.5 479.0 0.5 <500 - 1300 479.0 479.5 0.5 <500 - 990 479.5 480.0 0.5 <500 - 780 480.0 480.5 0.5 1400 - 3400 480.5 480.6 0.1 >61000 480.6 480.8 0.2 700 - 11200 480.8 482.5 1.7 >61000 482.5 483.0 0.5 1700 - 27700 483.0 483.5 0.5 <500 483.5 484.0 0.5 5200 - 8200 484.0 484.5 0.5 900 - 11700 484.5 485.0 0.5 1200 - 3700 485.0 485.5 0.5 1200 - 41100 485.5 486.0 0.5 <500 - 2740 486.0 486.5 0.5 500 - 12000 486.5 487.0 0.5 530 - 41600 487.0 487.5 0.5 2000 - 9100 487.5 488.0 0.5 <500 - 11200 488.5 489.0 0.5 <500 - 1900 489.0 489.5 0.5 <500 - 1200 489.5 490.0 0.5 <500 490.0 490.5 0.5 <500 - 3000 490.5 491.0 0.5 <500 - 520 491.0 492.0 1.0 <500 493.0 493.5 0.5 <500 494.5 495.0 0.5 <500 495.0 495.5 0.5 <500 - 540 495.5 496.0 0.5 <500 - 1200 496.0 496.5 0.5 <500 - 840 496.5 497.0 0.5 <500 497.5 498.5 1.0 <500 499.0 499.5 0.5 <500 499.5 500.0 0.5 <500 - 690 500.0 500.5 0.5 <500 - 670 500.5 501.0 0.5 <500 - 2100 501.0 501.5 0.5 <500 - 820 508.5 509.0 0.5 <500 509.0 509.5 0.5 <500 - 780 509.5 510.0 0.5 <500 512.0 513.0 1.0 <500 513.5 514.5 1.0 <500 518.5 519.0 0.5 <500 520.0 520.5 0.5 <500 - 1300 571.5 572.0 0.5 <500 572.0 572.5 0.5 <500 - 610 572.5 573.0 0.5 <500 574.0 574.5 0.5 <500 635.5 636.0 0.5 <500 882.5 883.0 0.5 <500 - 670 886.0 886.5 0.5 <500 887.5 888.0 0.5 <500 - 2040 894.0 896.0 2.0 <500 896.5 897.0 0.5 <500 903.5 904.0 0.5 580 - 1650 904.0 904.5 0.5 540 - 1010 904.5 905.0 0.5 600 - 1340 905.0 905.5 0.5 <500 905.5 906.0 0.5 <500 907.5 908.5 1.0 <500 908.5 909.0 0.5 <500 - 600 910.0 910.5 0.5 <500 - 1210 910.5 911.0 0.5 <500 - 1150 916.5 917.0 0.5 <500 - 730 919.0 919.5 0.5 <500 920.0 924.0 4.0 <500 924.0 924.5 0.5 <500 - 600 927.0 927.5 0.5 <500 - 520 944.5 945.0 0.5 <500 - 800 945.0 945.5 0.5 <500 - 580 945.5 946.0 0.5 <500 - 530 948.5 949.0 0.5 <500 952.5 953.0 0.5 <500 - 520 953.0 953.5 0.5 <500 953.5 954.0 0.5 <500 - 1100 954.0 954.5 0.5 <500 - 1500 956.0 956.5 0.5 <500 959.5 960.0 0.5 <500 - 840 960.0 960.5 0.5 <500 965.0 965.5 0.5 <500 966.0 966.5 0.5 <500 - 1040 966.5 967.5 1.0 <500 969.0 969.5 0.5 <500 970.0 970.5 0.5 <500 - 930 970.5 971.0 0.5 <500 972.5 973.0 0.5 <500 977.0 977.5 0.5 <500 - 520 977.5 978.0 0.5 670 - 2100 978.0 979.0 1.0 <500 979.0 979.5 0.5 <500 - 720 979.5 980.0 0.5 <500 980.5 981.0 0.5 <500 986.5 987.5 1.0 <500 999.0 999.5 0.5 <500 999.5 1000.0 0.5 <500 - 680 1005.0 1005.5 0.5 <500 - 2700 1005.5 1006.0 0.5 <500 1009.0 1009.5 0.5 <500 - 650 1011.0 1011.5 0.5 <500 1011.5 1012.0 0.5 <500 - 720 1013.5 1014.0 0.5 1000 - 2900 1014.0 1014.5 0.5 <500 - 2300 1015.5 1016.0 0.5 <500 - 720 1016.0 1016.5 0.5 <500 1016.5 1017.0 0.5 <500 - 630 1017.5 1018.0 0.5 <500 1018.0 1018.5 0.5 <500 - 970 1018.5 1019.0 0.5 <500 - 630 1024.5 1025.0 0.5 <500 1025.0 1025.5 0.5 <500 - 1150 1025.5 1026.0 0.5 <500 - 840 1026.0 1026.5 0.5 <500 1028.0 1028.5 0.5 <500 - 620 1030.0 1030.5 0.5 <500 1075.5 1076.0 0.5 <500 - 540 1082.5 1083.0 0.5 <500 - 900 1083.5 1084.0 0.5 <500 1084.0 1084.5 0.5 <500 - 1000 1084.5 1085.0 0.5 <500 - 1600 1089.5 1090.0 0.5 <500 1090.0 1090.5 0.5 <500 - 1200 1090.5 1091.0 0.5 <500 - 1400 1091.0 1091.5 0.5 2300 - 9500 1091.5 1092.0 0.5 <500 - 5900 1092.0 1092.5 0.5 <500 - 1900 1092.5 1093.0 0.5 <500 - 890 1093.0 1093.5 0.5 <500 - 1100 1093.5 1094.5 1.0 <500 1095.5 1096.0 0.5 <500 - 510 1096.0 1096.5 0.5 <500 - 750 1096.5 1097.5 1.0 <500 1097.5 1098.0 0.5 1200 - 2600 1098.0 1099.0 1.0 <500 1099.5 1100.0 0.5 <500 - 700 1100.0 1100.5 0.5 <500 1100.5 1101.0 0.5 <500 - 900 1101.0 1101.5 0.5 <500 - 1400 1101.5 1102.0 0.5 <500 - 1300 1102.0 1102.5 0.5 2200 - 34000 1102.5 1103.0 0.5 1100 - 20200 1103.0 1103.5 0.5 900 - 7900 1103.5 1104.0 0.5 500 - 1500 1104.0 1104.5 0.5 <500 1104.5 1105.0 0.5 <500 - 650 1105.0 1107.0 2.0 <500 1107.0 1107.5 0.5 <500 - 1400 1107.5 1108.0 0.5 <500 - 800 1108.0 1108.5 0.5 <500 - 650 1108.5 1109.0 0.5 <500 - 580 1109.0 1109.5 0.5 <500 - 870 1109.5 1110.0 0.5 <500 - 570 1110.0 1111.0 1.0 <500 1111.0 1111.5 0.5 <500 - 660 1111.5 1112.0 0.5 <500 - 570 1112.0 1112.5 0.5 <500 - 2400 1112.5 1113.0 0.5 <500 - 1100 1113.0 1114.0 1.0 <500 1116.0 1117.5 1.5 <500 1117.5 1118.0 0.5 550 - 6500 1118.0 1118.5 0.5 <500 - 1100 1118.5 1119.0 0.5 <500 1120.0 1120.5 0.5 <500 1126.5 1127.0 0.5 <500 1138.5 1139.0 0.5 <500 1140.5 1141.0 0.5 <500 - 520 1141.0 1141.5 0.5 <500 1147.5 1148.0 0.5 <500 - 2000 1176.0 1176.5 0.5 <500 - 2300 1176.5 1177.0 0.5 <500 1182.0 1182.5 0.5 <500 - 870 1183.0 1183.5 0.5 <500 RK-26-291 59 -70 345 N/A 327.5 328.5 1.0 <500 329.5 330.0 0.5 <500 RK-26-292 87 -75 465 111.1 172.0 172.5 0.5 <500 173.5 174.0 0.5 <500 174.0 174.5 0.5 <500 - 580 174.5 175.0 0.5 <500 187.0 187.5 0.5 <500 201.0 202.0 1.0 <500 203.0 203.5 0.5 <500 203.5 204.0 0.5 <500 - 3200 204.0 204.5 0.5 <500 - 650 204.5 205.0 0.5 <500 - 2500 205.0 205.5 0.5 <500 - 1000 205.5 206.5 1.0 <500 211.0 211.5 0.5 <500 211.5 212.0 0.5 <500 - 780 215.0 215.5 0.5 <500 - 710 215.5 216.0 0.5 <500 235.5 236.5 1.0 <500 237.5 238.0 0.5 <500 243.5 244.0 0.5 <500 244.0 244.5 0.5 <500 - 750 246.5 247.0 0.5 <500 - 700 247.0 248.0 1.0 <500 282.5 283.0 0.5 <500 284.5 286.0 1.5 <500 287.0 287.5 0.5 <500 287.5 288.0 0.5 500 - 1200 288.0 288.5 0.5 <500 - 560 288.5 289.5 1.0 <500 289.5 290.0 0.5 <500 - 600 290.0 291.0 1.0 <500 296.0 296.5 0.5 <500 296.5 297.0 0.5 <500 - 600 300.0 300.5 0.5 <500 - 550 301.0 301.5 0.5 <500 - 610 302.0 302.5 0.5 <500 302.5 303.0 0.5 <500 - 1100 303.5 304.0 0.5 <500 304.0 304.5 0.5 <500 - 580 304.5 305.0 0.5 <500 - 670 305.0 305.5 0.5 <500 306.0 306.5 0.5 <500 306.5 307.0 0.5 <500 - 550 307.5 308.0 0.5 <500 - 740 308.0 308.5 0.5 <500 308.5 309.0 0.5 <500 - 1140 309.0 309.5 0.5 <500 - 1500 309.5 310.0 0.5 <500 - 1000 310.0 311.0 1.0 <500 311.0 311.5 0.5 <500 - 680 311.5 312.5 1.0 <500 312.5 313.0 0.5 <500 - 650 319.0 319.5 0.5 <500 - 3080 319.5 320.0 0.5 <500 - 1070 320.0 320.5 0.5 500 - 1890 320.5 321.0 0.5 <500 321.5 322.0 0.5 <500 333.5 334.0 0.5 <500 335.5 336.0 0.5 <500 336.5 337.0 0.5 <500 337.5 338.0 0.5 <500 338.5 339.0 0.5 <500 339.0 339.5 0.5 880 - 11000 339.5 340.0 0.5 1500 - 5080 340.0 340.5 0.5 <500 - 750 340.5 341.0 0.5 <500 341.5 342.0 0.5 <500 342.5 343.0 0.5 <500 349.5 350.0 0.5 <500 355.0 355.5 0.5 <500 - 680 357.5 358.0 0.5 <500 - 920 358.0 358.5 0.5 <500 358.5 359.0 0.5 <500 - 580 359.0 359.5 0.5 <500 - 1320 367.5 368.5 1.0 <500 369.5 370.0 0.5 <500 384.0 384.5 0.5 <500 386.0 386.5 0.5 <500 387.0 390.0 3.0 <500 390.0 390.5 0.5 <500 - 520 390.5 391.0 0.5 <500 - 650 391.0 391.5 0.5 <500 394.5 395.0 0.5 <500 395.5 396.0 0.5 <500 399.0 399.5 0.5 600 - 5200 403.5 404.0 0.5 <500 - 1100 404.0 404.5 0.5 640 - 900 404.5 405.0 0.5 <500 - 920 405.0 405.5 0.5 <500 405.5 406.0 0.5 <500 - 700 407.0 407.5 0.5 <500 - 1300 407.5 408.0 0.5 <500 408.5 409.5 1.0 <500 415.5 416.0 0.5 <500 - 650 416.0 417.0 1.0 <500 422.0 423.0 1.0 <500 423.0 423.5 0.5 520 - 1250 423.5 424.0 0.5 1400 - 9000 424.0 424.5 0.5 1800 - 12600 424.5 426.0 1.5 <500 426.5 428.5 2.0 <500 430.0 430.5 0.5 <500 - 2000 430.5 431.0 0.5 <500 - 670 431.0 431.5 0.5 <500 - 1200 RK-26-293 272 -70 1104 110.7 957.0 957.5 0.5 <500 - 700 980.0 980.5 0.5 <500 - 750 980.5 981.0 0.5 1000 - 6300 982.0 990.5 8.5 <500 998.0 998.5 0.5 <500 - 2300 998.5 999.5 1.0 <500 999.5 1000.0 0.5 <500 - 2000 1000.5 1001.0 0.5 <500 - 1000 1001.0 1001.5 0.5 <500 1001.5 1002.0 0.5 500 - 10000 1002.0 1002.5 0.5 500 - 600 1002.5 1003.0 0.5 <500 1003.0 1003.5 0.5 800 - 1000 1003.5 1004.0 0.5 500 - 10200 1004.0 1004.5 0.5 <500 - 700 1004.5 1005.0 0.5 <500 1005.0 1005.5 0.5 <500 - 1000 1005.5 1006.0 0.5 920 - 24500 1006.0 1006.5 0.5 <500 - 750 1006.5 1007.5 1.0 <500 1007.5 1008.0 0.5 2000 - 58000 1008.0 1008.5 0.5 2200 - 6500 1008.5 1009.0 0.5 <500 - 10100 1010.0 1010.5 0.5 <500 - 720 1010.5 1011.0 0.5 3300 - 38000 1011.0 1011.5 0.5 9000 - 35000 1011.5 1012.0 0.5 1300 - 28000 1012.0 1012.5 0.5 <500 - 920 1012.5 1012.6 0.1 19000 - 50000 1012.6 1012.7 0.1 >61000 1012.7 1013.0 0.3 1700 - 8000 1013.0 1014.0 1.0 <500 1017.5 1018.0 0.5 <500 - 1070 1018.0 1018.5 0.5 <500 - 940 1018.5 1019.0 0.5 <500 - 5200 1021.0 1021.5 0.5 970 - 8000 1021.5 1022.0 0.5 620 - 7200 1022.0 1022.5 0.5 <500 - 6670 1022.5 1023.0 0.5 540 - 6500 1023.0 1023.5 0.5 <500 - 1600 1023.5 1024.0 0.5 <500 - 1740 1024.0 1024.5 0.5 <500 - 1020 1024.5 1025.0 0.5 500 - 7000 1025.0 1025.5 0.5 600 - 1500 1025.5 1026.0 0.5 <500 - 600 1026.0 1026.5 0.5 700 - 5000 1026.5 1027.0 0.5 1000 - 7000 1027.0 1027.5 0.5 1000 - 5000 1027.5 1028.0 0.5 <500 - 6000 1028.0 1028.5 0.5 <500 - 3000 1028.5 1029.0 0.5 <500 1029.0 1029.5 0.5 <500 - 1000 1029.5 1030.0 0.5 <500 - 700 1030.0 1030.5 0.5 <500 1030.5 1031.0 0.5 <500 - 1300 1031.0 1031.5 0.5 900 - 4000 1031.5 1032.0 0.5 900 - 8000 1032.0 1032.5 0.5 4000 - 8000 1032.5 1033.0 0.5 <500 - 800 1033.0 1033.5 0.5 <500 1033.5 1034.0 0.5 <500 - 2400 1034.0 1034.5 0.5 1000 - 5000 1034.5 1035.0 0.5 1200 - 4400 1035.0 1035.5 0.5 <500 - 740 1035.5 1036.0 0.5 <500 - 4500 1036.0 1036.5 0.5 740 - 5600 1036.5 1037.0 0.5 <500 - 610 1037.0 1037.5 0.5 <500 - 540 1037.5 1038.0 0.5 <500 - 2300 1038.0 1039.5 1.5 <500 1039.5 1040.0 0.5 <500 - 3800 1040.0 1040.5 0.5 1700 - 4000 1040.5 1041.0 0.5 900 - 3000 1041.0 1041.5 0.5 <500 1041.5 1042.0 0.5 1500 - 14000 1042.0 1042.5 0.5 500 - 1700 1042.5 1043.0 0.5 <500 - 550 1043.0 1043.5 0.5 <500 - 530 1043.5 1044.0 0.5 700 - 2300 1049.0 1049.5 0.5 <500 - 810 1049.5 1050.0 0.5 <500 1050.0 1050.5 0.5 <500 - 580 1050.5 1051.0 0.5 <500 - 1400 1051.5 1052.0 0.5 <500 1052.0 1052.5 0.5 <500 - 890 1052.5 1053.0 0.5 <500 1053.0 1053.5 0.5 <500 - 1800 1053.5 1054.0 0.5 <500 1058.0 1058.5 0.5 <500 - 750 1058.5 1059.0 0.5 <500 1065.5 1066.0 0.5 <500 RK-26-294 293 -60 813 113.8 645.0 645.5 0.5 <500 - 730 645.5 646.0 0.5 <500 - 580 646.0 647.0 1.0 <500 647.0 647.5 0.5 <500 - 670 647.5 650.0 2.5 <500 650.0 650.5 0.5 <500 - 650 652.0 652.5 0.5 500 - 5000 652.5 653.0 0.5 580 - 1600 653.0 653.5 0.5 <500 - 620 653.5 655.0 1.5 <500 655.0 655.5 0.5 <500 - 650 655.5 656.0 0.5 5400 - 16000 656.0 656.5 0.5 1500 - 10000 656.5 656.9 0.4 15000 - 55000 656.9 658.4 1.5 >61000 658.4 658.5 0.1 17000 - 25000 658.5 658.8 0.3 600 - 15000 658.8 659.0 0.2 >61000 659.0 659.5 0.5 7000 - 55000 659.5 660.0 0.5 2000 - 5300 660.0 660.5 0.5 <500 - 2300 660.5 661.0 0.5 <500 661.0 661.5 0.5 <500 - 1050 661.5 662.6 1.1 <500 662.6 662.7 0.1 >61000 662.7 663.0 0.3 <500 663.0 663.5 0.5 <500 - 17900 663.5 663.8 0.3 >61000 663.8 663.9 0.1 900 - 1200 663.9 664.2 0.3 >61000 664.2 664.3 0.1 10000 - 20000 664.3 664.6 0.3 >61000 664.6 664.9 0.3 5800 - 41800 664.9 665.0 0.1 >61000 665.0 665.1 0.1 29500 - 56000 665.1 665.4 0.3 >61000 665.4 665.5 0.1 900 - 1200 665.5 666.0 0.5 2100 - 31300 666.0 666.5 0.5 <500 - 1200 666.5 667.0 0.5 <500 - 1200 667.0 667.5 0.5 1200 - 6000 667.5 668.0 0.5 <500 - 1200 668.0 670.5 2.5 <500 670.5 671.0 0.5 <500 - 900 671.0 671.5 0.5 <500 - 1100 671.5 672.0 0.5 800 - 8500 672.0 672.5 0.5 <500 674.0 674.5 0.5 <500 674.5 675.0 0.5 <500 - 600 675.0 676.0 1.0 <500 678.5 679.5 1.0 <500 679.5 680.0 0.5 <500 - 620 721.5 722.0 0.5 <500 - 2300 742.5 743.0 0.5 <500 - 910 743.0 743.5 0.5 500 - 2600 743.5 744.0 0.5 <500 RK-26-294c1 293 -60 537 N/A No Significant Intersections RK-26-294c2 293 -60 768 N/A 643.5 644.0 0.5 <500 - 650 644.0 644.5 0.5 <500 644.5 645.0 0.5 <500 - 12000 658.0 658.5 0.5 <500 - 1700 666.0 667.0 1.0 <500 675.5 676.0 0.5 <500 - 1000 677.0 677.5 0.5 <500 - 2100 677.5 678.5 0.5 <500 678.5 679.0 0.5 <500 - 650 679.0 679.5 0.5 <500 - 800 679.5 680.0 0.5 <500 - 15800 680.0 680.5 0.5 <500 - 11000 680.5 681.0 0.5 600 - 5150 681.0 681.5 0.5 500 - 3600 681.5 682.0 0.5 <500 - 2800 682.0 682.5 0.5 <500 683.0 683.5 0.5 <500 - 900 683.5 684.0 0.5 <500 - 8300 684.0 684.5 0.5 <500 - 1300 684.5 685.0 0.5 500 - 5100 685.0 685.5 0.5 <500 687.5 688.0 0.5 <500 - 3400 689.0 689.5 0.5 <500 689.5 690.0 0.5 <500 - 1000 691.0 691.5 0.5 <500 - 1050 691.5 692.0 0.5 <500 692.0 692.5 0.5 <500 - 5600 692.5 693.0 0.5 <500 - 1300 693.0 693.5 0.5 <500 - 5650 693.5 694.0 0.5 1650 - 8700 694.0 694.5 0.5 2600 - 56400 694.5 695.0 0.5 3200 - 13800 695.0 695.5 0.5 600 - 13800 695.5 696.0 0.5 600 - 6300 696.0 696.5 0.5 <500 - 900 697.0 697.5 0.5 <500 - 4000 698.0 698.5 0.5 650 - 7500 698.5 699.0 0.5 2600 - 11000 699.0 699.5 0.5 2200 - 26700 699.5 700.0 0.5 600 - 13600 700.0 700.5 0.5 <500 - 680 700.5 701.5 0.5 <500 701.5 702.0 0.5 <500 - 940 702.0 702.5 0.5 1100 - 4000 703.5 704.0 0.5 <500 - 5200 704.0 704.5 0.5 <500 - 54000 721.0 721.5 0.5 <500 - 3200 722.5 723.0 0.5 <500 735.5 736.0 0.5 <500 - 2100 755.0 755.5 0.5 <500 RK-26-295 265 -65 519 117.0 No Significant Intersections RK-26-296 69 -73 546 104.9 322.0 322.5 0.5 <500 323.0 323.5 0.5 <500 333.0 333.5 0.5 <500 - 600 333.5 334.0 0.5 <500 340.0 340.5 0.5 <500 352.5 353.0 0.5 <500 354.5 355.0 0.5 <500 355.0 355.5 0.5 <500 - 700 355.5 356.0 0.5 <500 - 700 356.0 357.0 1.0 <500 370.0 370.5 0.5 <500 370.5 371.0 0.5 <500 - 1100 371.5 372.0 0.5 <500 - 2000 372.0 372.5 0.5 <500 - 1100 372.5 373.0 0.5 <500 - 900 373.0 373.5 0.5 <500 - 1000 373.5 374.5 1.0 <500 374.5 375.0 0.5 <500 - 600 375.0 376.0 1.0 <500 376.0 376.5 0.5 <500 - 4800 376.5 377.0 0.5 500 - 12500 377.0 377.5 0.5 800 - 6800 377.5 378.0 0.5 600 - 2100 378.0 378.5 0.5 <500 - 3100 378.5 379.0 0.5 <500 - 2500 389.5 391.0 1.5 <500 392.0 392.5 0.5 <500 - 800 393.5 394.5 1.0 <500 408.5 409.0 0.5 <500 409.5 410.0 0.5 <500 417.0 417.5 0.5 <500 - 850 417.5 418.0 0.5 <500 420.5 421.0 0.5 <500 421.0 421.5 0.5 <500 - 1200 421.5 422.0 0.5 <500 423.5 425.0 1.5 <500 425.0 425.5 0.5 1000 - 6900 425.5 426.0 0.5 <500 - 730 426.0 426.5 0.5 <500 426.5 427.0 0.5 <500 - 700 427.0 427.5 0.5 5000 - 30000 427.5 427.9 0.4 >61000 427.9 428.0 0.1 29200 - 34000 428.0 428.5 0.5 10000 - 20000 428.5 429.0 0.5 6300 - 46000 429.0 429.5 0.5 4500 - 28000 429.5 430.0 0.5 2500 - 10200 430.0 430.5 0.5 <500 - 3100 430.5 431.0 0.5 <500 - 1150 431.0 432.0 1.0 <500 438.5 439.0 0.5 <500 439.5 440.0 0.5 <500 - 520 440.0 441.0 1.0 <500 441.0 441.5 0.5 <500 - 700 441.5 442.0 0.5 <500 442.0 442.5 0.5 600 - 1800 442.5 443.0 0.5 <500 - 650 444.0 445.0 1.0 <500 445.0 445.5 0.5 600 - 1100 445.5 446.0 0.5 <500 - 1250 446.0 446.5 0.5 <500 - 550 446.5 449.5 3.0 <500 449.5 450.0 0.5 500 - 2000 450.0 450.5 0.5 <500 - 750 450.5 451.0 0.5 <500 - 650 451.0 451.5 0.5 <500 - 800 451.5 452.0 0.5 <500 - 780 452.0 452.5 0.5 <500 452.5 453.0 0.5 <500 - 1250 453.0 454.0 1.0 <500 471.5 472.0 0.5 <500 - 800 472.0 472.5 0.5 600 - 1750 472.5 473.0 0.5 700 - 3300 473.0 473.5 0.5 650 - 1420 473.5 474.0 0.5 <500 - 800 474.0 474.5 0.5 <500 - 1350 474.5 475.0 0.5 <500 495.5 496.0 0.5 <500 - 520 496.0 496.5 0.5 <500 - 760 496.5 497.0 0.5 <500 503.0 503.5 0.5 <500 - 530 503.5 504.0 0.5 <500 - 840 512.0 512.5 0.5 <500 513.0 514.0 1.0 <500 517.0 518.0 1.0 <500 518.0 518.5 0.5 <500 - 810 518.5 520.5 2.0 <500 540.5 541 0.5 <500 - 1100 544.5 545 0.5 <500   All depths and intervals are meters downhole, true thicknesses are yet to be determined. "Off-scale" refers to >61,000 cps (counts per second) readings by gamma spectrometer type RS-125. "High-grade" refers to >10,000 cps readings by gamma spectrometer type RS-125. "Anomalous" means >500 cps readings by gamma spectrometer type RS-120. Where "CPS Range" is <500 cps, this refers to local low radioactivity within the overall interval. Unconformity of 'N/A' denotes a lack of visible contact between Athabasca sandstone and basement rock. Maximum internal dilution 2.0 m downhole. All depths and intervals are meters 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. 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. Contact Information Leigh Curyer Chief Executive Officer NexGen Energy Ltd. +1 604 428 4112 [email protected] www.nexgenenergy.ca Travis McPherson Chief Commercial Officer NexGen Energy Ltd. +1 604 428 4112 [email protected] www.nexgenenergy.ca Monica Kras Vice President, Corporate Development NexGen Energy Ltd. +44 7307 191933 [email protected] www.nexgenenergy.ca 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 PCE mineralization, scale and grade, the anticipated effects of completed drill results on PCE, the addition of a fifth drill rig at PCE, completion of the 2026 summer drilling program at PCE, receipt and release of the results 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 statements that certain actions, events or results "may", "could", "would", "might" or "will" be taken, occur or be achieved or the negative connotation thereof. 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 results of planned exploration activities are as anticipated, 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, 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 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 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 most recently filed Annual Information Form and NexGen's annual report on Form 40-F filed with the United States Securities and Exchange Commission, which are available on SEDAR+ and EDGAR. 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 the 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/311333