Aldebaran Reports 1,339.30 m of 0.45% CuEq (0.38% Cu, 0.14 g/t Au & 2.54 g/t Ag) including 500 m of 0.71% CuEq (0.58% Cu, 0.35 g/t Au & 1.42 g/t Ag) at the Altar Copper-Gold Project in San Juan, Argentina

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Also reports 1,059.20 m of 0.51% CuEq1, including 249.20 m of 0.71% CuEq1and1,198.00 m of 0.43% CuEq1, including 388.00 m of 0.63% CuEq1and826.10 m of 0.54% CuEq1, including 98.00 m of 1.07% CuEq1 VANCOUVER, British Columbia, May 21, 2026 (GLOBE NEWSWIRE) -- Aldebaran Resources Inc. (“Aldebaran” or the “Company”) (TSX-V: ALDE, OTCQX: ADBRF) is pleased to provide results of seven holes from the infill 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. Highlights ALD-26-173EXT ALD-26-199EXT ALD-26-174EXT ALD-26-036EXT ALD-26-187DEXT ALD-26-180EXT ALD-26-259 1- For individual assays for all metals, see Table 1 John Black, Chief Executive Officer of Aldebaran, commented: “The holes reported today continue to demonstrate the size and quality of the Altar deposit. Several of the holes ended in attractive grade mineralization, which speaks to the scale of the mineralized system at Altar. As we look forward, the near-term catalysts for Aldebaran are the release of additional drill results from the project and an updated mineral resource estimate in Q3 of this year, which will incorporate more than 40,000 m of drilling since our last resource estimate in 2024. This resource will set the table for the Pre-Feasibility Study, which will completed in Q2/Q3 2027.” Kevin B. Heather, Chief Geological Officer of Aldebaran, commented: “An important aspect of any resource infill drill program is to demonstrate continuity of mineralization and grade; both of which the current program continues to successfully deliver. In addition, the infill drill holes provide critical new technical information that will refine our geological models and add to our orebody knowledge, both of which will facilitate more informed decisions on processing methodologies, as well as open pit and underground infrastructure design in the upcoming Pre-Feasibility Study.” Table 1 below shows detailed assays for all seven 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. Qualified Person The scientific and technical data contained in this news release has been reviewed and approved by Dr. Kevin B....

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