Also reports 
1,323.20 m of 0.50% CuEq¹, including 555 m of 0.71% CuEq¹
and
939.30 m of 0.58% CuEq¹, including 420.30 m of 0.76% CuEq¹
and
1,354 m of 0.41% CuEq¹, including 162 m of 0.61% CuEq¹
and
1,336 m of 0.38% CuEq¹, including 124 m of 0.69% CuEq¹

Aldebaran Resources Inc. (TSX-V: ALDE) (OTCQX: ADBRF) is pleased to provide results of six holes from the 2025-2026 infill and geotechnical drilling program at the Altar project in San Juan, Argentina. The goal of these holes was to upgrade resource blocks classified as Inferred to the Measured & Indicated categories and in some cases, also for geotechnical purposes.

Highlights

ALD-26-267

• 1,257.30 m of 0.66% CuEq¹ from 135.70 m depth
  • Including 513 m of 1.06% CuEq¹ from 514 m depth
    • Including 214 m of 1.57% CuEq¹ from 520 m depth

ALD-26-261

• 1,323.20 m of 0.50% CuEq¹ from 157 m depth
  • Including 802.20 m of 0.64% CuEq¹ from 678 m depth
    • Including 555 m of 0.71% CuEq¹ from 816 m depth
      • Including 58 m of 0.94% CuEq¹ from 818 m depth

ALD-25-262

• 939.30 m of 0.58% CuEq¹ from 368 m depth
  • Including 763.30 m of 0.65% CuEq¹ from 544 m depth
    • Including 420.30 m of 0.76% CuEq¹ from 887 m depth
      • Including 204.30 m of 0.84% CuEq¹ from 1,103 m depth

ALD-26-182EXT

• 1,354 m of 0.41% CuEq¹ from 56 m depth
  • Including 107 m of 0.61% CuEq¹ from 646 m depth
  • and 162 m of 0.61% CuEq¹ from 893 m depth

ALD-26-263

• 1,336 m of 0.38% CuEq¹ from 213 m depth
  • Including 124 m of 0.69% CuEq¹ from 670 m depth

¹For individual assays for all metals, see Table 1

John Black, Chief Executive Officer of Aldebaran, commented: “Today’s drill results are a reminder of the impressive scale of Altar’s high-grade cores and the significant size of the project. Looking ahead, the upcoming mineral resource estimate, expected in October of this year, will establish the foundation for the pre-feasibility study expected in Q2/Q3 2027.”

Kevin B. Heather, Chief Geological Officer of Aldebaran, commented: “Many of these reported holes were oriented drill holes designed for geotechnical purposes; however, they were also designed to provide essential infill data for resource category conversion from Inferred to Indicated and Measured for the upcoming mineral resource estimate. The oriented drill holes also allow us to better understand and constrain the orientations in 3D-space of lithological contacts, faults, fractures, and veins; all of which enhance our geological model for the upcoming resource estimate and form the basis for both the open pit and potential underground designs in the PFS mine plan.”

Table 1 below shows detailed assays for all six holes. Figure 1 displays a plan map of the completed drill hole locations, while Figures 2 to 7 display cross sections of the holes reported herein. Holes with the suffix EXT are extensions of previously drilled holes.

20

0

Project Update

Turnaround times at assay labs have been much longer than expected, which has led to delays in releasing drill results from the previous field campaign. It is expected all final assays should be received shortly. Due to the delay in receiving assays, the completion of the updated mineral resource estimate will be pushed out by one month to October 2026. This isn’t expected to delay the pre-feasibility timeline, with expected delivery in Q2/Q3 2027.

Qualified Person

The scientific and technical data contained in this news release has been reviewed and approved by Dr. Kevin B. Heather, B.Sc. (Hons), M.Sc, Ph.D, FAusIMM, FGS, Chief Geological Officer and director of Aldebaran, who serves as the qualified person (QP) under the definitions of National Instrument 43-101.

About Aldebaran Resources Inc. 

Aldebaran is a mineral exploration company that was spun out of Regulus Resources Inc. in 2018 and has the same core management team. Aldebaran holds an 80% interest in the Altar copper-gold project in San Juan Province, Argentina. The Altar project hosts multiple porphyry copper-gold deposits with potential for additional discoveries. Altar forms part of a cluster of world-class porphyry copper deposits which includes Los Pelambres (Antofagasta Minerals), El Pachón (Glencore), and Los Azules (McEwen Copper). In November 2024 the Company announced an updated mineral resource estimate for Altar, prepared by Independent Mining Consultants Inc. and based on the drilling completed up to and including the 2023-24 field season (independent technical report prepared by Independent Mining Consultants Inc., Tucson, Arizona, titled “Technical Report, Estimated Mineral Resources, Altar Project, San Juan Province, Argentina“, dated December 31, 2024 – see news release dated November 25, 2024). In October 2025 the Company announced a Preliminary Economic Assessment (PEA) for the Altar Project (independent technical report prepared by SRK Consulting Inc, Denver, Colorado, titled “NI 43-101 Technical Report Preliminary Economic Assessment Altar Project San Juan, Argentina”, dated September 30, 2025 – see news release dated October 30, 2025).