Aldebaran Reports 1,728.9 m of 0.45% CuEq (0.41% Cu, 0.03 g/t Au & 1.34 g/t Ag), including 756 m of 0.68% CuEq (0.61% Cu, 0.03 g/t Au & 2.12 g/t Ag) at the Altar Copper-Gold Project in San Juan, Argentina

Also reports 
918.8 m of 0.62% CuEq¹, including 302 m of 0.76% CuEq¹
and
901 m of 0.47% CuEq¹, including 196 m of 0.73% CuEq¹
and
940.7 m of 0.49% CuEq¹, including 165 m of 0.80% CuEq¹
and
841.9 m of 0.54% CuEq¹, including 253 m of 0.73% CuEq¹

VANCOUVER, British Columbia, Oct. 05, 2026 (GLOBE NEWSWIRE) -- Aldebaran Resources Inc. (“Aldebaran” or the “Company”) (TSX-V: ALDE, OTCQX: ADBRF) is pleased to provide results from all remaining holes of the 2025-2026 infill and geotechnical drilling program at the Altar project in San Juan, Argentina. The drilling program was designed to upgrade Inferred resources to the higher-confidence Measured and Indicated categories while also supporting geotechnical studies. Several of the holes reported today were drilled exclusively for geotechnical purposes in final pit wall areas where significant mineralization was not expected.

Highlights

ALD-26-260

• 1,728.90 m of 0.45% CuEq¹ from 141.00 m depth
  • Including 1,427.90 of 0.52% CuEq¹ from 442.00 m depth
    • Including 756.00 m of 0.68% CuEq¹ from 965.00 m depth
      • Including 88.00 m of 0.84% CuEq¹ from 1,211.00 m depth

ALD-26-266

• 918.80 m of 0.62% CuEq¹ from 59.00 m depth
  • Including 87.00 m of 0.88% CuEq¹ from 59.00 m depth
  • And 302.00 m of 0.76% CuEq¹ from 422.00 m depth
    • Including 212.00 m of 0.83% CuEq¹ from 490.00 m depth

ALD-26-265

• 901.00 m of 0.47% CuEq¹ from 249 m depth
  • Including 781.00 m of 0.52% CuEq¹ from 296.00 m depth
    • Including 196.00 m of 0.73% CuEq¹ from 516.00 m depth
      
      

ALD-26-269

• 940.70 m of 0.49% CuEq¹ from 63.00 m depth
  • Including 165.00 m of 0.80% CuEq¹ from 533.00 m depth
  • And 227.00 m of 0.60% CuEq¹ from 771.00 m depth
    
    

ALD-26-271

• 841.90 m of 0.54% CuEq¹ from 193.00 m depth
  • Including 253.00 m of 0.73% CuEq¹ from 722.00 m depth

¹ For individual assays for all metals, see Table 1

John Black, Chief Executive Officer of Aldebaran, commented: “A mineralized interval exceeding 1.7 kilometres in a single drill hole underscores the immense scale of the Altar system. As we move toward our updated mineral resource estimate, we will be incorporating more than 40,000 m of drilling completed at the main Altar deposit since the last resource estimate in late 2024, as well as approximately 30,000 m of drilling completed at the adjacent Radio Porphyry target. Radio Porphyry has never been included in a mineral resource estimate, making this an important milestone for the project. We believe the 2026 resource update will better demonstrate the scale and growth potential of the broader Altar Project and position us well for the Pre-Feasibility Study scheduled for completion in 2027.”

Kevin B. Heather, Chief Geological Officer of Aldebaran, commented: “With the release of this final batch of drill hole results, the Altar project continues to amaze us with long continuous intervals of copper mineralization. The 2025-2026 drilling campaign results have exceeded our expectations, and while we were waiting on these final results to arrive, we have been busy refining and improving our geological and geotechnical models based on this recent drilling. Collectively this bodes well for the upcoming mineral resource estimate and the pre-feasibility study.”

Table 1 below shows detailed assays for all thirteen holes. Figure 1 displays a plan map of the completed drill hole locations, while Figures 2 to 11 display cross sections of the holes reported herein.

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-26-260- Total Depth - 1,869.9 m
Interval	141.00	1,869.90	1,728.90	0.41	0.03	1.34	123	81	0.45
Incl.	442.00	1,869.90	1,427.90	0.47	0.03	1.49	143	87	0.52
Incl.	965.00	1,721.00	756.00	0.61	0.03	2.12	197	76	0.68
Incl.	1,211.00	1,299.00	88.00	0.76	0.05	1.87	232	69	0.84
ALD-26-265 - Total Depth - 1,150.00 m
Interval	249.00	1,150.00	901.00	0.41	0.15	1.21	15	183	0.47
Incl.	296.00	1,077.00	781.00	0.45	0.17	1.29	15	196	0.52
Incl.	516.00	712.00	196.00	0.61	0.30	1.64	12	171	0.73
Incl.	619.00	677.00	58.00	0.72	0.42	2.06	8	218	0.87
And	740.00	824.00	84.00	0.52	0.18	1.51	6	382	0.59
And	866.00	945.20	79.20	0.60	0.17	1.58	19	327	0.67
ALD-26-266 - Total Depth -977.80 m
Interval	59.00	977.80	918.80	0.58	0.09	1.58	14	275	0.62
Incl.	59.00	146.00	87.00	0.82	0.13	1.94	13	446	0.88
Incl.	61.00	126.00	65.00	0.90	0.15	2.18	13	591	0.96
And	422.00	724.00	302.00	0.70	0.14	1.11	11	51	0.76
Incl.	490.00	702.00	212.00	0.77	0.16	1.20	8	59	0.83
ALD-26-268 - Total Depth - 550.00 m
Interval	36.00	231.00	195.00	0.24	0.04	1.23	25	362	0.26
ALD-26-269 - Total Depth -1,003.70 m
Interval	63.00	1,003.70	940.70	0.42	0.16	1.37	22	212	0.49
Incl.	533.00	698.00	165.00	0.68	0.31	1.85	13	260	0.80
Incl.	771.00	998.00	227.00	0.53	0.16	2.33	13	383	0.60
ALD-26-270 - Total Depth - 525.00 m
No Reportable Intervals
ALD-26-271 - Total Depth - 1,034.90 m
Interval	193.00	1,034.90	841.90	0.50	0.08	1.02	31	116	0.54
Incl.	722.00	975.00	253.00	0.69	0.07	0.91	31	40	0.73
Incl.	732.00	781.00	49.00	0.77	0.14	1.20	13	106	0.83
ALD-26-272 - Total Depth - 350.00 m
No Reportable Intervals
ALD-26-273 - Total Depth - 435.00 m
No Reportable Intervals
ALD-26-274 - Total Depth - 521.00 m
Interval	114.00	169.00	55.00	0.18	0.03	0.61	5	291	0.19
ALD-26-275 - Total Depth - 360.00 m
No Reportable Intervals
ALD-26-276 - Total Depth - 416.20 m
Interval	321.00	416.20	95.20	0.13	0.33	0.64	22	567	0.25
ALD-26-277 - Total Depth - 230.00 m
Interval	118.00	230.00	112.00	0.13	0.07	1.48	11	459	0.17
The grades are uncut. CuEq values were calculated using copper, gold, silver, and molybdenum. Metal prices utilized for the calculations are Cu = US$3.00/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). Intervals represent true thickness of the deposit.

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.

ON BEHALF OF THE ALDEBARAN BOARD

(signed) “John Black”

John Black, Chief Executive Officer and Director
Tel: +1 (604) 685-6800
Email: info@aldebaranresources.com

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For further information, please consult our website at www.aldebaranresources.com or contact:

Ben Cherrington
Manager, Investor Relations
Phone: +44 7538 244 208
Email: ben.cherrington@aldebaranresources.com

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).

Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.

Sampling and Analytical Procedures

Altar follows systematic and rigorous sampling and analytical protocols which meet and exceed industry standards. These protocols are summarized below and are available on the Aldebaran website at www.aldebaranresources.com.
All drill holes are diamond core holes with PQ, HQ or NQ core diameters. Drill core is collected at the drill site where recovery and RQD (Rock Quality Designation) measurements are taken before the core is boxed and transported to the Altar camp facilities, a short distance away, where the whole core is photographed under more optimum lighting conditions and geological quick log is produced. The whole-core is then marked and sampled into geological defined, systematic 1- to 2-metre sample intervals, unless the geologist determines the presence of an important geological contact, which should not be crossed. The whole-core is then cut-in-half with a diamond saw blade, with half the sample retained in the core box for future reference and the other half placed into a pre-labelled plastic bag, sealed with a two plastic security zip ties, and labeled with a unique sample number. The bagged samples are then placed into larger plastic sacks, and those sacks are sealed with another plastic security zip tie and labelled for shipment. The sacks are then placed onto wooden pallets and wrapped in plastic shrink-wrap and stored in a secure area pending shipment to a certified ALS laboratory sample preparation facility located in Mendoza, Argentina, where the samples are dried, crushed, and pulverized. The resulting sample pulps are sent by batch to the ALS laboratory in Lima for geochemical assay analysis, including a 30g fire assay with an atomic absorption (AA) finish analysis for gold and a full multi-acid digestion (4-acid) with ICP-AES analysis for other elements. Samples with results that exceed maximum detection values for gold are re-analyzed by fire assay with a gravimetric finish and other elements of interest are re-analyzed using precise ore-grade ICP analytical techniques. Aldebaran independently inserts certified control standards (Super Certified Reference Materials (SCRM’s), coarse field blanks, and duplicates into the sample stream to monitor data quality. These control samples represent 10-12% of the total samples submitted and are inserted “blindly” to the laboratory in the sample sequence prior to departure from the Aldebaran facilities. 

Forward-Looking Statements

Certain statements regarding Aldebaran, including management's assessment of future-plans and operations, may constitute forward-looking statements under applicable securities laws and necessarily involve known and unknown risks and uncertainties, most of which are beyond Aldebaran's control. Often, but not always, forward-looking statements or information can be identified by the use of words such as "plans", "expects" or "does not expect", "is expected", "budget", "scheduled", "estimates", "forecasts", "intends", "anticipates" or "does not anticipate" or "believes" or variations of such words and phrases or statements that certain actions, events or results "may", "could", "would", "might" or "will" be taken, occur or be achieved.

Specifically, and without limitation, all statements included in this press release that address activities, events or developments that Aldebaran expects or anticipates will or may occur in the future, including the proposed exploration and development of the Altar project described herein, and management's assessment of future plans and operations and statements with respect to the completion of the anticipated exploration and development programs, the mineral resource estimate and pre-feasibility study, may constitute forward-looking statements under applicable securities laws and necessarily involve known and unknown risks and uncertainties, most of which are beyond Aldebaran's control. These risks may cause actual financial and operating results, performance, levels of activity and achievements to differ materially from those expressed in, or implied by, such forward-looking statements. Although Aldebaran believes that the expectations represented in such forward-looking statements are reasonable, there can be no assurance that such expectations will prove to be correct. The forward-looking statements contained in this press release are made as of the date hereof and Aldebaran does not undertake any obligation to publicly update or revise any forward-looking statements or information, whether as a result of new information, future events or otherwise, unless so required by applicable securities law.

Photos accompanying this announcement are available at:

https://www.globenewswire.com/NewsRoom/AttachmentNg/78f75527-61e5-406d-bffd-056750d3a021

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