Aldebaran Reports Infill Drilling Results from Eleven Holes at the Altar Copper-Gold Project in San Juan Argentina

Aldebaran Resources Inc. (TSX-V: ALDE) (OTCQX: ADBRF) is pleased to provide results of 11 holes from the in-fill drilling program currently being completed at the Altar project in San Juan, Argentina. The goal of these holes was to upgrade blocks of known resource classified as Inferred to Measured & Indicated. All holes reported today were focused either on the Altar Central or Altar United zones.

Highlights

ALDE-25-038EXT

578.00 m of 0.51% CuEq from 372.00 m depth
- Including 116.45 m 0.60% CuEQ from 448.55 m depth
- Including 63.70 m of 0.62% CuEq from 601.30 m depth
- Including 175.00 m of 0.61% CuEQ from 699.00 m depth

ALDE-25-118EXT

557.00 m of 0.39% CuEq from 352.00 m depth

ALDE-25-135EXT

383.40 m of 0.47% CuEq from 476.00 m depth
- Including 81.00 m of 0.62% CuEq from 751.00 m depth

John Black, Chief Executive Officer of Aldebaran, commented: “As expected, the results from the infill drill program at Altar are confirming the continuity of known mineralization and should convert resources currently classified as Inferred to Measured and Indicated. The information gained from these drill holes will add significant value as we transition from the upcoming PEA to a PFS in 2026. While the focus of the current drill program is to infill known mineralization, the deposit remains open in several directions.”

Kevin B. Heather, Chief Geological Officer of Aldebaran, commented: “Having completed a total of 25,186.70 m of drilling during the 2024-2025 field campaign, the largest total by Aldebaran since taking over the project in 2018, we should convert a large portion of the potential in-pit inferred resource blocks to the measured and indicated categories. These infill holes can be divided into two groups: (1) holes that are truly drilled in between existing holes and hence demonstrate the continuity of known mineralization, and (2) holes drilled around the peripheries of the deposit to add supporting data to convert adjacent resource blocks to a higher confidence category. In some cases, these more peripheral holes extended the mineralized footprint.”

Table 1 below shows detailed assays for all the holes. Figure 1 displays a plan map of the completed drill hole locations, while figures 2 to 10 display cross sections of the holes reported herein.

Table 1 – Drill Hole Results
	From (m)	To (m)	Interval (m)	Cu (%)	Au (g/t)	Ag (g/t)	Mo (ppm)	As (ppm)	CuEq (%)
ALD-25-30EXT – Total Depth 597.30 m
Interval	316.00	396.00	80.00	0.25	0.05	0.25	9	52	0.27
ALDE-25-038EXT – Total Depth 950.00 m
Interval	372.00	950.00	578.00	0.47	0.04	1.35	114	209	0.51
Incl.	448.55	565.00	116.45	0.55	0.07	1.30	70	138	0.60
Incl.	601.30	665.00	63.70	0.57	0.04	1.49	147	467	0.62
Incl.	699.00	874.00	175.00	0.54	0.05	1.67	171	174	0.61
ALDE-25-080EXT – Total Depth 925.00 m
Interval	38.00	170.00	132.00	0.17	0.05	0.57	73	569	0.20
Interval	258.00	302.00	44.00	0.20	0.04	0.50	59	593	0.23
Interval	414.00	925.00	511.00	0.35	0.03	0.70	86	227	0.38
Incl.	706.00	925.00	219.00	0.51	0.03	0.94	87	178	0.54
Incl.	790.00	925.00	135.00	0.62	0.03	1.15	105	200	0.66
ALD-25-081EXT – Total Depth 517.80 m
Interval	150.00	517.80	517.80	0.26	0.03	0.48	26	199	0.28
ALDE-25-118EXT – Total Depth 909.00 m
Interval	352.00	909.00	557.00	0.35	0.03	1.51	57	292	0.39
Incl.	796.00	828.00	32.00	0.51	0.04	1.62	73	101	0.55
ALDE-25-135EXT – Total Depth 859.40 m
Interval	476.00	859.40	383.40	0.43	0.04	1.75	82	586	0.47
Incl.	578.00	611.00	33.00	0.66	0.03	2.69	39	1,692	0.69
Incl.	626.00	656.00	30.00	0.54	0.03	2.50	139	1,353	0.59
Incl.	751.00	832.00	81.00	0.56	0.06	1.53	128	137	0.62
ALDE-25-230 – Total Depth 813.80 m
Interval	167.75	233.00	65.25	0.51	0.12	0.91	30	534	0.56
Interval	321.60	386.00	64.40	0.36	0.07	0.71	23	419	0.39
Interval	458.00	813.80	355.80	0.28	0.03	1.24	46	568	0.31
Incl.	672.00	813.80	141.80	0.43	0.04	1.70	72	656	0.47
Incl.	686.00	716.00	30.00	0.50	0.04	1.51	39	1,345	0.52
ALDE-25-246 – Total Depth 892.00 m
Interval	468.00	892.00	424.00	0.29	0.03	0.80	40	166	0.31
Incl.	854.00	880.00	26.00	0.54	0.04	1.30	48	289	0.57
ALDE-25-247 – Total Depth 899.60 m
Interval	237.00	899.60	662.60	0.38	0.12	1.73	16	176	0.43
ALDE-25-248 – Total Depth 951.80 m
Interval	349.00	518.00	169.00	0.10	0.17	0.56	10	278	0.17
Interval	558.00	951.80	393.80	0.24	0.07	1.23	20	311	0.27
ALD-25-249 – Total Depth 950.00 m
Interval	252.00	950.00	698.00	0.22	0.13	0.92	7	140	0.27
The grades are uncut. Reported intervals represent true thickness of mineralization. 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).

Project Update

The 2024/2025 field campaign is now complete, and all crews and equipment have been demobilized. A total of 25,186.70 m of drilling was completed on the project during the 2024-2025 field campaign, including 5,977.50 m of drilling completed for metallurgical purposes (see Company news release dated April 15, 2025 for details on metallurgical hole locations). Figure 1 displays the location of all the infill drill hole locations. In addition to drilling this season, the Company has completed downhole televiewer surveys on several holes to be used for geotechnical purposes.

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).