Aldebaran Reports 936 m of 0.66% CuEq (0.62% Cu, 0.09 g/t Au and 1.16 g/t Ag), including 194 m of 0.99% CuEq (0.92% Cu, 0.19 g/t Au and 1.02 g/t Ag) at the Altar Copper-Gold Project in San Juan Argentina VANCOUVER, British Columbia, April 09, 2026 (GLOBE NEWSWIRE) -- Aldebaran Resources Inc. (“Aldebaran” or the “Company”) (TSX-V: ALDE, OTCQX: ADBRF) is pleased to provide results of five 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-26-049EXT 936.00 m of 0.66% CuEq from 130 m depth Including 94 m of 0.79% CuEq from 138 m depthIncluding 352 m of 0.84% CuEq from 264 m depth Including 194 m of 0.99% CuEq from 346 m depth Including 87 m of 0.77% CuEq from 976 m depth ALD-26-159EXT 1,048 m of 0.40% CuEq from 260 m depth Including 490 m of 0.52% CuEq from 260 m depth Including 216 m of 0.70% CuEq from 262 m depth ALD-26-171EXT 1,353 m of 0.29% CuEq from 70 m depth Including 274 m of 0.36% CuEq from 831 m depth ALD-26-175EXT 1,270 m of 0.29% CuEq from 74 m depth ALD-26-021EXT 190 m of 0.22% CuEq from 26 m depth164 m of 0.29% CuEq from 928 m depth John Black, Chief Executive Officer of Aldebaran, commented: “The 2025-2026 infill drilling program is well underway, and the results today demonstrate the consistency of mineralization at the Altar project. These holes will provide valuable information as we move toward a resource update and pre-feasibility study.” Kevin B. Heather, Chief Geological Officer of Aldebaran, commented: “The current 2025-2026 infill drilling program, along with the 2024-2025 infill program, are critical for mineral resource conversion from the Inferred to the Measured and Indicated categories; neither of which are reflected in the current 2024 mineral resource estimate. Only Measured and Indicated resource blocks can be considered in a prefeasibility study and for the first time in the history of the Altar project, we will be declaring Proven and Probable reserves, which is a significant step in the derisking process for the project.” Table 1 below shows detailed assays for all five holes. Figure 1 displays a plan map of the completed drill hole locations, while Figures 2 to 5 display cross sections of the holes reported herein. Holes with the suffix EXT are extensions of previously drilled holes. Table 1. Altar Drill Hole Results From(m)To(m)Interval(m)Cu(%)Au(g/t)Ag(g/t)Mo(ppm)As(ppm)CuEq(%)ALD-26-021EXT - Total Depth 1163.00 mInterval26.00216.00190.000.200.040.3039230.22Interval284.00368.0084.000.180.030.63493520.20Interval928.001,092.00164.000.270.012.60273490.29ALD-26-049EXT - Total Depth 1066.00 mInterval130.001,066.00936.000.620.091.16192290.66Incl.138.00232.0094.000.750.091.2521180.79Incl.264.00616.00352.000.780.170.8641460.84Incl.346.00538.00194.000.920.191.0221130.99Incl.976.001,063.0087.000.730.022.941207200.77ALD-26-159EXT - Total Depth - 1308.40 mInterval260.001,308.401,048.400.370.060.78312370.40Incl.260.00750.00490.000.480.090.72153110.52Incl.262.00478.00216.000.650.120.92104380.70Incl.262.00352.0090.000.800.100.70151560.85ALD-26-171EXT- Total Depth - 1423.00 mInterval70.001,423.001,353.000.260.050.92401770.29Incl.252.00288.0036.000.500.210.9792880.58ALD-26-175EXT - Total Depth - 1270.00 mInterval74.001,270.001,196.000.260.040.60561520.29Incl.493.00942.00449.000.360.060.70531500.40Incl.533.00565.5032.500.490.091.25591090.54The grades are uncut. CuEq values were calculated using copper, gold, silver, and molybdenum. Metal prices utilized for the calculations are Cu = US$3/lb, Au = US$1,400/oz, Ag = US$18/oz, and Mo = US$10/lb. Recoveries used for the supporting metals found in the CuEq equation are as follows: Au = 50%, Ag = 51%, (based on historical metallurgical test work) and Mo = 70% (benchmarking from similar deposits). The formula utilized to calculate equivalent values is CuEq % = Cu % + (Au g/t * 0.34025) + (Ag g/t * 0.00446) + (Mo ppm * 0.00023). EXT indicates the hole was extended from a previously drilled hole. Intervals represent the true thickness of the deposit. Project Update The Company is actively drilling with six rigs on the property. The focus of the program is to complete both infill and geotechnical drilling that will be necessary for the upcoming pre-feasibility study (the “PFS”). Upon completion of this year's drilling, the Company will complete an updated mineral resource estimate (the “MRE”), which is anticipated for Q3-2026. SRK Consulting Inc. has been hired to complete the MRE. The Company will also drill water wells this field season as part of its water-balance studies, and continues to collect environmental data, both of which are essential for the PFS and beyond. The Company has engaged SRK Consulting Inc. (Denver) as lead consultants for the PFS, with Knight Piesold as a subcontractor. The Company has also engaged Whittle Consulting Ltd (“Whittle”) to complete an optimization of