Announcement PDF 31 Cliff Street, Fremantle WA 6160 | +61 8 6383 7883 | info@tesorogold.com.au | tesorogold.com.au ASX ANNOUNCEMENT 15 JUNE 2026 ASX: TSO OTCQB: TSORF FSE: 5D7 TERNERA INFILL DRILLING NEARS COMPLETION FOCUS TO SHIFT TO NEW DISCOVERY DRILLING Tesoro Gold Limited (Tesoro or the Company) (ASX: TSO, OTCQB: TSORF, FSE: 5D7) is pleased to report the latest batch of assay results from infill drilling completed at the Ternera Gold Deposit (Ternera), part of the El Zorro Gold Project in Chile (El Zorro, or the Project). Results from an additional eleven holes continue to support the continuity and grade distribution profile of mineralisation within Ternera, one of the deposit’s key defining characteristics. Infill drilling is nearing completion with the final five holes expected to be completed within the next two weeks. Assays for a further 16 holes are currently in the lab, with final infill results to be incorporated into an updated Mineral Resource Estimate (MRE) and support the declaration of a near-term maiden Ore Reserve for Ternera. On completion of the infill programme, three rigs will be redeployed to the 12,000m new- discovery focused drilling programme, targeting new areas of gold mineralisation at multiple, high-priority prospects across the Company’s 40km-long gold corridor (Figure 3 and 4). HIGHLIGHTS  Multiple thick, high-grade intercepts returned from infill drilling continue to demonstrate the continuity and predictability of gold mineralisation within Ternera.  66.30m @ 1.71g/t Au from 375.00m (ZDDH0436) including:  23.30m @ 3.77g/t Au from 375.70m and  8.50m @ 6.08g/t Au from 389.50m  35.00m @ 1.20g/t Au from 533.00m (ZDDH0440A) including:  4.00m @ 5.16g/t Au from 537.00m  137.72m @ 0.67 g/t Au from 331.73m (ZDDH0455) including:  12.62m @ 4.70g/t Au from 364.38m and;  5.77m @ 10.27g/t Au from 370.50m  17.20m @ 1.53g/t Au from 387.00m (ZDDH0456) including:  5.95m @ 3.35g/t Au from 395.05m  Infill drilling nearing completion, with final results to facilitate an update and upgrade to the MRE ahead of the declaration of a maiden Ore Reserve for Ternera.  Focus set to shift to ongoing extensional drilling at near-deposit targets including Ternera East and Drone Hill. Tesoro Gold 2 ASX ANNOUNCEMENT 15 JUNE 2026  District-scale new discovery drilling is scheduled to commence in the coming weeks, initially at La Brea, before progressing across multiple high-priority targets within the broader El Zorro gold corridor. Tesoro Managing Director, Zeff Reeves, commented: “This is another strong set of infill results from Ternera, delivering consistent, wide intercepts of gold mineralisation at expected downhole locations. The increased drill density Is expected to support the upgrade of several zones of the MRE to the Indicated classification, qualifying for use in the calculation of the maiden Ore Reserve for Ternera. Together with our strong metallurgical results, the continuity profile of Ternera, which is a key defining feature of the deposit, validates our view that the Project supports a simple, straightforward future mining and processing operation. From this point, our drilling focus will progressively shift towards adding new ounces through near-deposit growth and new discovery drilling. This includes targets at Ternera East and Drone Hill, as well as district-scale targets such as La Brea and Pena Blanca across Tesoro’s 40km mineralised El Zorro gold corridor.” TERNERA INFILL DRILLING Tesoro is progressing 38,000m of diamond drilling across the El Zorro Gold Project. Six diamond drill rigs are currently active at Ternera, completing the final stages of the infill and geotechnical drilling campaigns. This component of drilling is primarily designed to upgrade the Mineral Resource classification within areas of Ternera, in support of an updated MRE, maiden Ore Reserve declaration and Definitive Feasibility Study (DFS) level mine planning. To date the infill programme has completed 76 holes for 25,210m, with assays received for 60 holes. Five holes remain to be drilled, and assays are outstanding for 16 holes. Assay results from this batch of eleven holes have returned multiple thick, high-grade intercepts, including:  66.30m @ 1.71g/t Au from 375.00m (ZDDH0436) including:  23.30m @ 3.77g/t Au from 375.70m and  8.50m @ 6.08g/t Au from 389.50m  35.00m @ 1.20g/t Au from 533.00m (ZDDH0440A) including:  4.00m @ 5.16g/t Au from 537.00m  137.72m @ 0.67 g/t Au from 331.73m (ZDDH0455) including:  12.62m @ 4.70g/t Au from 364.38m and;  5.77m @ 10.27g/t Au from 370.50m  17.20m @ 1.53g/t Au from 387.00m (ZDDH0456) including:  5.95m @ 3.35g/t Au from 395.05m Tesoro Gold 3 ASX ANNOUNCEMENT 15 JUNE 2026 All holes intercepted zones of significant gold mineralisation at predicted downhole locations demonstrating the robustness of the existing MRE block model and the geological interpretation of Ternera. All significant intercepts from this batch are presented in Appendix 1, with full details provided in Appendix 2. B B’ A A’ Tesoro Gold 4 ASX ANNOUNCEMENT 15 JUNE 2026 Figure 1: El Zorro Gold Project – Ternera Gold Deposit. Drill locations and results received in this announcement. Section shown at figure 2 located at A-A’ and Figure 3 at B-B’. Datum PSAD56 19S. Figure 2: El Zorro Gold Project –Drilling section A-A’. Showing holes ZDDH0440A, ZDDH0430 and ZDDDH0456 and resource classification of current MRE block model. Holes displayed are projected onto section +/-20m. Looking northwest. Datum PSAD56 19S. Refer ASX announcement 30 April 2026 for results from ZDDH0430. Tesoro Gold 5 ASX ANNOUNCEMENT 15 JUNE 2026 Figure 3: El Zorro Gold Project –Drilling section B-B’. Showing holes ZDDH0441, ZDDH0453 and ZDDDH0455 and resource classification of current MRE block model. Holes displayed are projected onto section +/-20m. Looking northwest. Datum PSAD56 19S. DRILLING FOCUS TO SHIFT TO GROWTH AND NEW DISCOVERY TARGETS Following completion of the Ternera infill programme, drilling will be prioritised to near- deposit growth targets and district-scale new discovery targets. Near-deposit drilling will include targets at Ternera East, Drone Hill and extensions to the north and south of the existing Ternera Deposit. These areas provide potential to define additional mineralisation close to the current Resource and future development footprint (Figure 4). In parallel, new access is being established at the La Brea and Pena Blanca district targets, which are scheduled to be drill tested in the coming weeks. These programmes form part of Tesoro’s broader strategy to test multiple high-priority gold targets across the 30km-long El Zorro mineralised corridor (Figure 5). Tesoro Gold 6 ASX ANNOUNCEMENT 15 JUNE 2026 Figure 4: Ternera Gold Deposit high priority extensional drill targets. Ternera is open to the north and south and significant potential exists for additional mineralisation to be defined with more drilling at Ternera East and Drone Hill. Refer to ASX announcements 22 October 2025, 22 March 2025, 2 July 2024, 13 June 2024, 8 November 2022, 28 October 2022, 1 December 2022, 3 November 2021, 27 August 2021, 6 July 2021 and 25 June 2021for historic results. Tesoro Gold 7 ASX ANNOUNCEMENT 15 JUNE 2026 Figure 5: El Zorro Gold Project showing priority targets over a greater than 30km corridor. Refer to ASX Announcement dated 19 March 2026 for geophysics results. Tesoro Gold 8 ASX ANNOUNCEMENT 15 JUNE 2026 Authorised by the Board of Tesoro Gold Ltd. For more information: Company Zeff Reeves Managing Director info@tesorogold.com.au Investor Relations & Media Enquiries Grace Lauder Fivemark Partners Grace.lauder@fivemark.com.au Follow Us  Website  LinkedIn  X Table 1: Ternera Mineral Estimates for selected cut-off grades. Highlighted open pit Mineral Resource has been constrained by an optimised pit shell using a gold price of US$3000/oz and process recovery of 94.5%. The estimates in this table are rounded to reflect their precision; rounding errors are apparent. Tenera Updated MRE Indicated Inferred Total Au g/t cut-off Mt Au g/t Koz Mt Au g/t Koz Mt Au g/t Koz Optimised Open Pit at 0.30 31.8 1.10 1,123 19.5 1.11 692 51.2 1.1 1,816 2.00 3.5 3.55 394 2.5 3.54 280 5.9 3.54 673 1.00 10.5 2.08 705 7.9 2.04 520 18.5 2.06 1,225 0.70 17.5 1.58 891 13 1.57 657 30.5 1.58 1,547 0.30 31.8 1.10 1,128 26.1 1.03 863 58.1 1.07 1,992 0.20 33.8 1.05 1,144 28.7 0.96 885 62.5 1.01 2,028 Refer ASX announcement dated 4 August 2025. Tesoro Gold 9 ASX ANNOUNCEMENT 15 JUNE 2026 About Tesoro Tesoro Gold Limited has discovered and defined the first Intrusive Related Gold System in Chile. The 1.82M oz Ternera discovery is in the Coastal Cordillera region of Chile. The Coastal Cordillera region is host to multiple world-class copper and gold mines, has well established infrastructure, service providers and an experienced mining workforce. Large areas of the Coastal Cordillera remain unexplored due to the unconsolidated nature of mining concession ownership, but Tesoro, via its in-country network and experience has been able secure rights to the district- scale El Zorro gold project in-line with the Company’s strategy. Tesoro’s 95% owned Chilean subsidiary owns 95.4% of the El Zorro Gold Project (see ASX announcement released 12 August 2025). Future Performance This announcement may contain certain forward-looking statements and opinions. Forward-looking statements, including projections, forecasts and estimates, are provided as a general guide only and should not be relied on as an indication or guarantee of future performance and involve known and unknown risks, uncertainties, assumptions, contingencies and other important factors, many of which are outside the control of the Company and which are subject to change without notice and could cause the actual results, performance or achievements of the Company to be materially different from the future results, performance or achievements expressed or implied by such statements. Past performance is not necessarily a guide to future performance, and no representation or warranty is made as to the likelihood of achievement or reasonableness of any forward-looking statements or other forecast. Nothing contained in this announcement, nor any information made available to you is, or and shall be relied upon as, a promise, representation, warranty or guarantee as to the past, present or the future performance of Tesoro Gold. Competent Persons Statements The information in this report that relates to Mineral Resources is based on information compiled by Mr Lynn Widenbar (B.Sc. (Hons) Geology, M.Sc. FAusIMM, MAIG), a Competent Person who is a Fellow of The Australasian Institute of Mining and Metallurgy. Mr Widenbar is acting as an independent consultant to Tesoro Gold Limited. Mr Widenbar has sufficient experience that is relevant to the style of mineralisation and type of deposit under consideration, and to the activity being undertaken to qualify as a Competent Person as defined in the 2012 Edition of the ‘Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves’. The Company confirms that it is not aware of any new information or data that materially affects the information contained the form and context in which the Competent Person’s findings are presented have not been materially modified from in the original announcement on 4 August 2025, and all material assumptions and technical parameters underpinning the estimates in that announcement continue to apply and have not materially changed. The information in this report that relates to Exploration Results is based on information compiled by Mr Zeffron Reeves (B App Sc (Hons) Applied Geology) MBA, MAIG). Mr Reeves is a member of the Australian Institute of Geoscientists and a Director and shareholder of the Company. Mr Reeves has sufficient experience that is relevant to the style of mineralisation and type of deposit under consideration and to the activity which he is undertaking to qualify as a Competent Person as defined in the 2012 Edition of the Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves. Mr Reeves consents to the inclusion in this report of the matters based on this information in the form and context in which it appears. Tesoro Gold 10 ASX ANNOUNCEMENT 15 JUNE 2026 APPENDIX 1: SIGNIFCANT INTERCEPT TABLE Significant intercepts table for results reported in this announcement. Results are uncut, no top cut has been applied. Refer Appendix 3 - JORC Tables for data aggregation criteria. A significant intercept is defined as any intercept with a down hole grade x width >0.25. NSI denotes No Significant Intercept. Hole_ID From (m) To (m) Interval Au (g/t) Comments Hole_ID From (m) To (m) Interval Au (g/t) Comments ZDDH0436 327.00 330.00 3.00 0.67 ZDDH0455 403.33 404.03 0.70 1.10 ZDDH0436 356.00 361.00 5.00 0.60 ZDDH0455 406.00 406.55 0.55 2.47 ZDDH0436 375.00 441.30 66.30 1.71 ZDDH0455 414.00 415.00 1.00 2.23 ZDDH0436 375.70 399.00 23.30 3.77 including ZDDH0455 426.00 427.00 1.00 1.90 ZDDH0436 375.70 380.60 4.90 5.45 including ZDDH0455 432.00 435.00 3.00 0.50 ZDDH0436 389.50 398.00 8.50 6.08 including ZDDH0455 454.38 455.71 1.33 1.17 ZDDH0436 439.00 440.70 1.70 8.97 including ZDDH0455 466.34 469.45 3.11 0.74 ZDDH0440A 208.38 210.30 1.92 1.35 ZDDH0456 266.00 267.00 1.00 2.46 ZDDH0440A 288.00 298.00 10.00 0.59 ZDDH0456 307.00 336.00 29.00 0.68 ZDDH0440A 372.00 373.00 1.00 0.55 ZDDH0456 307.00 311.19 4.19 1.25 including ZDDH0440A 376.00 377.50 1.50 0.70 ZDDH0456 321.36 325.00 3.64 2.52 including ZDDH0440A 433.00 434.00 1.00 0.70 ZDDH0456 365.70 366.25 0.55 1.12 ZDDH0440A 438.00 439.00 1.00 1.28 ZDDH0456 387.00 404.20 17.20 1.53 ZDDH0440A 493.00 494.00 1.00 2.83 ZDDH0456 395.05 401.00 5.95 3.35 including ZDDH0440A 508.00 509.00 1.00 0.61 ZDDH0456 441.72 451.00 9.28 1.51 ZDDH0440A 512.00 513.00 1.00 1.40 ZDDH0456 444.00 446.00 2.00 4.00 including ZDDH0440A 518.00 520.00 2.00 1.65 ZDDH0456 472.00 473.00 1.00 11.07 ZDDH0440A 533.60 568.60 35.00 1.20 ZDDH0457 216.00 229.00 13.00 0.64 ZDDH0440A 537.00 541.00 4.00 5.16 including ZDDH0457 216.00 219.26 3.26 1.32 including ZDDH0449 262.25 266.45 4.20 0.86 ZDDH0457 228.00 229.00 1.00 3.10 including ZDDH0449 262.25 263.70 1.45 1.79 including ZDDH0457 298.00 299.00 1.00 1.11 ZDDH0449 278.00 280.00 2.00 0.58 ZDDH0457 349.00 350.00 1.00 0.71 ZDDH0449 294.46 296.20 1.74 1.05 ZDDH0458 0.00 Awaiting Assays ZDDH0449 308.60 321.40 12.80 0.92 ZDDH0459 237.00 242.00 5.00 2.28 ZDDH0449 308.60 312.50 3.90 1.22 including ZDDH0459 237.00 240.00 3.00 3.51 including ZDDH0449 315.50 321.00 5.50 1.61 including ZDDH0459 256.00 257.00 1.00 1.83 ZDDH0449 329.80 330.15 0.35 8.37 ZDDH0459 282.00 283.00 1.00 1.10 ZDDH0449 344.19 345.00 0.81 7.98 ZDDH0459 318.75 319.55 0.80 0.50 ZDDH0449 354.00 355.00 1.00 1.09 ZDDH0459 338.96 351.24 12.28 0.68 ZDDH0449 361.00 362.00 1.00 1.20 ZDDH0459 340.35 341.53 1.18 1.63 including ZDDH0449 371.60 372.00 0.40 1.08 ZDDH0459 345.68 348.07 2.39 1.43 including ZDDH0449 395.00 395.70 0.70 1.68 ZDDH0459 365.40 370.00 4.60 0.44 ZDDH0449 445.00 462.00 17.00 0.57 ZDDH0460 0.00 Awaiting Assays ZDDH0450 14.43 15.50 1.07 0.94 ZDDH0461 0.00 Awaiting Assays ZDDH0450 214.00 216.00 2.00 0.65 ZDDH0462 160.95 170.11 9.16 0.50 ZDDH0450 219.07 220.00 0.93 1.32 ZDDH0462 160.95 161.65 0.70 1.46 including ZDDH0452 102.00 112.54 10.54 0.98 ZDDH0462 164.20 164.70 0.50 1.55 including ZDDH0452 102.00 107.10 5.10 1.54 including ZDDH0462 166.17 166.60 0.43 1.60 including ZDDH0452 171.30 178.00 6.70 2.98 ZDDH0462 168.60 170.11 1.51 1.10 including ZDDH0452 251.85 252.44 0.59 0.51 ZDDH0462 186.50 188.00 1.50 2.05 ZDDH0452 254.55 255.00 0.45 0.89 ZDDH0462 201.12 202.23 1.11 0.99 ZDDH0452 302.00 309.59 7.59 0.59 ZDDH0462 223.00 225.00 2.00 0.68 ZDDH0452 306.00 309.59 3.59 0.97 including ZDDH0462 245.00 270.50 25.50 0.59 ZDDH0452 412.00 414.35 2.35 2.01 ZDDH0462 245.00 245.58 0.58 4.55 including ZDDH0455 113.00 115.00 2.00 4.18 ZDDH0462 250.06 252.95 2.89 2.02 including ZDDH0455 280.00 283.00 3.00 0.40 ZDDH0462 267.23 270.50 3.27 1.39 ZDDH0455 331.73 342.92 11.19 0.87 ZDDH0463 3.22 7.60 4.38 0.91 ZDDH0455 340.00 342.92 2.92 1.74 including ZDDH0463 3.22 4.20 0.98 2.39 including ZDDH0455 364.38 377.00 12.62 4.70 ZDDH0463 52.00 52.84 0.84 1.11 ZDDH0455 370.50 375.72 5.22 10.27 including ZDDH0463 69.69 70.04 0.35 5.12 ZDDH0455 398.50 400.00 1.50 1.02 ZDDH0463 99.00 100.00 1.00 0.70 Tesoro Gold 11 ASX ANNOUNCEMENT 15 JUNE 2026 APPENDIX 2: DRILLING DETAILS Drillhole details for holes drilled from the Ternera Infill Drilling Programme Northing Easting Elevation Dip Azimuth Northing Easting Elevation Di p Azimuth ZDDH00406 341572 7036394 579 -60 240 207.70 ZDDH00442 341688 7036321 597 -60 240 205.70 ZDDH00407 341561 7036218 557 -60 240 56.50 ZDDH00443 341870 7035976 617 -60 240 418.10 ZDDH00407A 341567 7036220 566 -60 240 130.10 ZDDH00444 341591 7036130 574 -60 240 175.20 ZDDH00408 341505 7036285 563 -60 240 109.00 ZDDH00445 342063 7036220 680 -60 240 265.82 ZDDH00409 342280 7035724 549 -60 240 964.50 ZDDH00445A 342065 7036222 680 -60 240 404.00 ZDDH00410 341600 7036067 600 -60 240 192.30 ZDDH00446 341674 7036347 594 -60 240 150.00 ZDDH00411 342213 7035800 574 -60 240 700.00 ZDDH00447 342119 7036422 677 -60 240 352.40 ZDDH00412 341874 7036012 632 -60 240 450.00 ZDDH00447A 342119 7036422 677 -60 240 440.00 ZDDH00413 341848 7036478 638 -60 240 200.10 ZDDH00440A 342059 7036251 690 -60 240 573.40 ZDDH00414 341573 7036155 556 -60 240 172.10 ZDDH00448 341562 7036080 575 -60 240 121.10 ZDDH00415 341897 7036505 637 -60 240 290.65 ZDDH00449 341930 7036078 657 -60 240 480.20 ZDDH00416 341618 7036248 565 -60 240 174.50 ZDDH00450 341914 7036583 646 -60 240 254.10 ZDDH00417 342207 7036402 639 -60 240 205.80 ZDDH00451 341720 7035893 574 -60 240 301.00 ZDDH00418 341828 7036501 641 -60 240 268.00 ZDDH00452 341850 7035965 614 -60 240 421.10 ZDDH00417A 342207 7036402 639 -60 240 481.00 ZDDH00453 341952 7036056 665 -60 240 520.15 ZDDH00420 341643 7036262 572 -60 240 175.00 ZDDH00454 341820 7036017 620 -60 240 375.00 ZDDH00419 341871 7036457 633 -60 240 209.50 ZDDH00455 341980 7036070 671 -60 240 520.00 ZDDH00421 342237 7035698 543 -60 240 680.10 ZDDH00456 342161 7036308 640 -60 240 520.00 ZDDH00422 341748 7036080 574 -60 240 287.50 ZDDH00457 341790 7035932 601 -60 240 359.70 ZDDH00423 341652 7036335 581 -60 240 150.00 ZDDH00458 341718 7036132 590 -60 240 375.90 ZDDH00424 342156 7036374 649 -60 240 493.60 ZDDH00459 342114 7036350 656 -60 240 400.00 ZDDH00425 341971 7036580 668 -60 240 191.00 ZDDH00460 342159 7036341 641 -60 -240 518.00 ZDDH00426 341656 7036167 585 -60 240 267.60 ZDDH00461 341776 7036027 596 -60 -240 343.10 ZDDH00427 341724 7036204 611 -60 240 281.10 ZDDH00462 342112 7036555 706 -60 240 309.30 ZDDH00428 341879 7036564 628 -60 240 223.40 ZDDH00463 341565 7036116 570 -60 240 150.00 ZDDH00429 341703 7036089 574 -60 240 250.95 ZDDH00464 342000 7036118 673 -60 240 514.10 ZDDH00430 342135 7036294 656 -60 240 435.00 ZDDH00465 342147 7036438 665 -60 240 400.00 ZDDH00431 341740 7036178 604 -60 240 391.74 ZDDH00466 341919 7036243 627 -60 240 440.50 ZDDH00432 342136 7036568 717 -60 240 310.00 ZDDH00467 34211 7036250 665 -60 240 473.40 ZDDH00433 341588 7036094 588 -60 240 110.55 ZDDH00468 342129 7036395 664 -60 240 430.10 ZDDH00434 341947 7036567 659 -60 240 176.20 ZDDH00469 341910 7036066 650 -60 240 450.00 ZDDH00435 341563 7035977 572 -60 240 150.00 ZDDH00470 342152 7036406 661 -60 240 481.70 ZDDH00436 342156 7036271 640 -60 240 460.30 ZDDH00471 342152 7036406 677 -60 240 500.00 ZDDH00437 341583 7035920 566 -60 240 146.60 ZDDH00472 341903 7036028 644 -60 240 356.00 ZDDH00438 341655 7036097 598 -60 240 220.60 ZDDH00473 341674 7035839 554 -60 240 160.80 ZDDH00439 341706 7036228 597 -60 240 230.00 ZDDH00474 342086 7036198 661 -60 240 70.30 ZDDH00440 342059 7036251 690 -60 240 607.20 ZDDH00475 341983 7036142 664 -60 240 455.00 ZDDH00441 341670 7035900 556 -60 240 250.23 ZDDH00476 341695 7035851 564 -60 240 223.50 Hole Orientation Drill Depth (m) Hole Location Hole Orientation Drill Depth (m) Hole ID Hole Location Hole ID Tesoro Gold 12 ASX ANNOUNCEMENT 15 JUNE 2026 APPENDIX 3: JORC TABLES Section 1: Sampling Techniques and Data Criteria JORC Code explanation Commentary Sampling techniques  Nature and quality of sampling (e.g. cut channels, random chips, or specific specialised industry standard measurement tools appropriate to the minerals under investigation, such as downhole gamma sondes, or handheld XRF instruments, etc.). These examples should not be taken as limiting the broad meaning of sampling. Tesoro has completed 493 diamond drill holes at the El Zorro Gold Project for 156,021m. Diamond drill holes were drilled with HQ. Sampling was half core at geologically defined and significant mineralisation boundaries. The CP considers the sampling methodologies to be appropriate for this style of mineralisation.  Include reference to measures taken to ensure sample representivity and the appropriate calibration of any measurement tools or systems used. Tesoro Diamond drill holes were drilled with HQ. Sampling was half core at geological and significant mineralisation boundaries. The CP consider this appropriate for the style of mineralisation.  Aspects of the determination of mineralisation that are Material to the Public Report. In cases where ‘industry standard’ work has been done; this would be relatively simple (e.g. ‘reverse circulation drilling was used to obtain 1 m samples from which 3 kg was pulverised to produce a 30 g charge for fire assay’). In other cases, more explanation may be required, such as where there is coarse gold that has inherent sampling problems. Unusual commodities or mineralisation types (e.g. submarine nodules) may warrant disclosure of detailed information. Diamond drilling was used to obtain ½ core samples of various lengths (minimum 0.25m), from which 1kg of material was pulverised passing 200 mesh to produce a 50g charge for fire assay fusion with a gravimetric finish. Multielement assays were completed by 4-acid digest with a 2.5g charge. The CP consider these appropriate assay techniques. Drilling techniques  Drill type (e.g. core, reverse circulation, open-hole hammer, rotary air blast, auger, Bangka, sonic, etc.) and details (e.g. core diameter, triple or standard tube, depth of diamond tails, face- sampling bit or other type, whether core is oriented and if so, by what method, etc.). Tesoro has completed 493 diamond drill holes at the El Zorro Gold Project for 156,021m. Diamond drill holes were drilled with HQ. Sampling was half core at geological and significant mineralisation boundaries. Standard tube was used. Drill sample recovery  Method of recording and assessing core and chip sample recoveries and results assessed. Core recovery was estimated using the drillers recorded depth marks against the length of the core recovered. Reviewing the core photos, there are occasional shears/faults where core is broken. There is however no significant core loss.  Measures taken to maximise sample recovery and ensure representative nature of the samples. A single tube system was employed and in general core recovery good.  Whether a relationship exists between sample recovery and grade and whether sample bias may have occurred due to preferential loss/gain of fine/coarse material. There appears to be no potential sample bias as there was no regular loss of core. Logging  Whether core and chip samples have been geologically and geotechnically logged to a level of detail to support appropriate Mineral Resource estimation, mining studies and metallurgical studies. Geological core logging to a resolution of 25 cm was undertaken with a record kept of, inter alia, colour, lithology, weathering, grain size, mineralisation, alteration, geotechnical characteristics etc. Diamond core is stored at the Company’s warehouse. Tesoro consider the data to be of an appropriate level of detail to support a future resource estimation. Tesoro Gold 13 ASX ANNOUNCEMENT 15 JUNE 2026 Criteria JORC Code explanation Commentary  Whether logging is qualitative or quantitative in nature. Core (or costean, channel, etc.) photography. Logging of diamond core was qualitative, and diamond core was photographed.  The total length and percentage of the relevant intersections logged. All drilled intervals are logged and recorded. Subsampling techniques and sample preparation  If core, whether cut or sawn and whether quarter, half or all core taken. Drill core was cut, and half core was collected for analysis  If non-core, whether riffled, tube sampled, rotary split, etc. and whether sampled wet or dry. Tesoro has not completed any percussion drilling.  For all sample types, the nature, quality and appropriateness of the sample preparation technique. Collection of half core ensured the nature, quality and appropriateness of the collected sample. The sample preparation of crushing half core at the lab to mm size prior to splitting off a 50g charge (either by cone/quarter or riffle) for pulverisation provides an appropriate and representative sample for analysis.  Quality control procedures adopted for all subsampling stages to maximise representivity of samples. Half core was collected for the entirety of the Tesoro drilling, as such there was consistency throughout the drilling. Core was logged by a qualified geoscientist. Each subsample is considered to be representative of the interval.  Measures taken to ensure that the sampling is representative of the in-situ material collected, including for instance results for field duplicate/second-half sampling. Sampling of half core is representative of the in-situ material. There are field duplicate samples collected from the diamond core with irregular results. Field drill core duplicates are irregular by nature, and it has been recommended by Tesoro’s consultants to use coarse reject material to monitor the sample preparation.  Whether sample sizes are appropriate to the grain size of the material being sampled. Sample sizes collected were considered appropriate to reasonably represent the material being tested. Quality of assay data and laboratory tests  The nature, quality and appropriateness of the assaying and laboratory procedures used and whether the technique is considered partial or total. Assays reported in this report were undertaken at the accredited laboratory of ALS Santiago, which is fully certified. Core samples of various lengths were assayed (minimum 0.25m) from which 1kg of material was pulverized passing 200 mesh to produce a 50 g charge for fire assay fusion with gravimetric finish. Multielement assays were completed by 4-acid digest with a 2.5 g charge. All techniques are appropriate for the element being determined.  For geophysical tools, spectrometers, handheld XRF instruments, etc., the parameters used in determining the analysis including instrument make and model, reading times, calibrations factors applied and their derivation, etc. Standard chemical analyses were used for grade determination. There was no reliance on determination of analysis by geophysical tools.  Nature of quality control procedures adopted (e.g. standards, blanks, duplicates, external laboratory checks) and whether acceptable levels of accuracy (i.e. lack of bias) and precision have been established. QAQC procedures included the insertion of Certified Reference Materials (CRMs) (5%) and blank material (2%), Check samples (5%) and check assaying (5%) The laboratories used have generally demonstrated analytical accuracy at an acceptable level within 95% confidence limits. Verification of sampling and assaying  The verification of significant intersections by either independent or alternative company personnel. All intercepts have been verified by multiple appropriately qualified Company personnel.  The use of twinned holes. No twinned holes have been completed  Documentation of primary data, data entry procedures, data verification, data Tesoro drilling is digitally entered and stored following documented core handling protocols. The protocols are considered adequate. Tesoro Gold 14 ASX ANNOUNCEMENT 15 JUNE 2026 Criteria JORC Code explanation Commentary storage (physical and electronic) protocols.  Discuss any adjustment to assay data. No adjustments were made to Tesoro Drilling Location of data points  Accuracy and quality of surveys used to locate drillholes (collar and downhole surveys), trenches, mine workings and other locations used in Mineral Resource estimation. Tesoro drill hole collars have been surveyed accurately using differential GPS for all holes.  Specification of the grid system used. The grid system used PSAD56 19S  Quality and adequacy of topographic control. The topography generated from an accurate topographic survey data completed by a registered surveyor and has been used for the current control. Data spacing and distribution  Data spacing for reporting of Exploration Results. Drill hole spacing is variable between 25m and 200m  Whether the data spacing and distribution is sufficient to establish the degree of geological and grade continuity appropriate for the Mineral Resource and Ore Reserve estimation procedure(s) and classifications applied. The current data spacing and distribution is not considered suitable for Mineral Resource and Ore reserve estimation at this early exploration stage.  Whether sample compositing has been applied. Sample compositing was not employed at the sampling stage. Orientation of data in relation to geological structure  Whether the orientation of sampling achieves unbiased sampling of possible structures and the extent to which this is known, considering the deposit type. Drill holes were drilled across the interpreted strike of the mineralisation.  If the relationship between the drilling orientation and the orientation of key mineralised structu