1- For individual assays for all metals, see Table 1
1- For individual assays for all metals, see Table 1
NEWS RELEASE
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
Also reports
1,059.20 m of 0.51% CuEq1, including 249.20 m of 0.71% CuEq1
and
1,198.00 m of 0.43% CuEq1, including 388.00 m of 0.63% CuEq1
and
826.10 m of 0.54% CuEq1, including 98.00 m of 1.07% CuEq1
VANCOUVER, CANADA (May 21, 2026) – 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
• 1,339.30 m of 0.45% CuEq1 from 12 m depth
o Including 500 m of 0.71% CuEq1 from 326 m depth
§ Including 96 m of 0.94% CuEq1 from 436 m depth
§ Including 60 m of 1.00% CuEq1 from 606 m depth
ALD-26-199EXT
• 1,059.20 m of 0.51% CuEq1 from 326 m depth
o Including 221.50 m of 0.61% CuEq1 from 868.50 m depth
o Including 249.20 m of 0.71% CuEq1 from 1,136 m depth
§ Including 54 m of 0.92% CuEq1 from 1,270 m depth
ALD-26-174EXT
• 1,198.00 m of 0.43% CuEq1 from 92 m depth
o Including 388 m of 0.63% CuEq1 from 530 m depth
ALD-26-036EXT
• 826.10 m of 0.54% CuEq1 from 124 m depth
o Including 98 m of 1.07% CuEq1 from 140 m depth
o Including 78 m of 0.68% CuEq1 from 280 m depth
ALD-26-187DEXT
• 934.00 m of 0.37% CuEq1 from 324 m depth
ALD-26-180EXT
• 895 m of 0.28% CuEq1 from 496 m depth
ALD-26-259
• 513 m of 0.47% CuEq1 from 924 m depth
o Including 59 m of 0.62% CuEq1 from 1,378 m depth
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.
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-26-036EXT - Total Depth - 950.10 m
Interval 24.00 78.00 54.00 0.31 0.14 2.54 13 367 0.37
Interval 124.00 950.10 826.10 0.51 0.08 1.27 12 221 0.54
Incl. 140.00 238.00 98.00 1.00 0.15 2.19 12 332 1.07
And 280.00 358.00 78.00 0.63 0.13 1.69 5 365 0.68
And 416.00 458.00 42.00 0.57 0.11 0.87 6 309 0.61
And 690.00 738.00 48.00 0.59 0.08 1.11 4 69 0.62
ALD-25-173EXT - Total Depth - 1352.30 m
Interval 12.00 1,351.30 1,339.30 0.38 0.18 1.22 15 145 0.45
Incl. 326.00 826.00 500.00 0.58 0.35 1.42 6 118 0.71
Incl. 436.00 532.00 96.00 0.75 0.54 1.49 8 259 0.94
And 606.00 666.00 60.00 0.85 0.42 2.17 8 30 1.00
ALD-26-174EXT - Total Depth - 1290.00 m
Interval 92.00 1,290.00 1,198.00 0.39 0.09 1.11 33 226 0.43
Incl. 530.00 918.00 388.00 0.57 0.15 1.63 19 227 0.63
ALD-26-180EXT - Total Depth - 1391.00 m
Interval 496.00 1,391.00 895.00 0.25 0.05 1.02 48 98 0.28
ALD-26-187D Ext - Total Depth - 1258.00 m
Interval 324.00 1,258.00 934.00 0.33 0.05 0.76 89 148 0.37
Incl. 475.00 525.00 50.00 0.54 0.13 1.13 21 109 0.60
From
(m)
To:
(m)
Interval
(m)
Cu
(%)
Au
(g/t)
Ag
(g/t)
Mo
(ppm)
As
(ppm)
CuEq
(%)
ALD-26-199EXT - Total Depth - 1385.20 m
Interval 326.00 1,385.20 1,059.20 0.47 0.04 1.65 85 219 0.51
Incl. 326.00 358.00 32.00 0.64 0.12 0.48 6 357 0.68
Incl. 868.50 1,090.00 221.50 0.57 0.02 2.11 92 92 0.61
Incl. 1,136.00 1,385.20 249.20 0.65 0.03 1.92 186 54 0.71
Incl. 1,270.00 1,324.00 54.00 0.81 0.03 1.82 382 4 0.92
ALD-26-259 - Total Depth - 1292.00 m
Interval 924.00 1,437.00 513.00 0.42 0.04 1.22 158 129 0.47
Incl. 1,120.00 1,162.00 42.00 0.47 0.04 2.42 244 235 0.55
Incl. 1,202.00 1,296.00 94.00 0.49 0.04 1.28 194 136 0.56
Incl. 1,378.00 1,437.00 59.00 0.55 0.04 1.69 221 72 0.62
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). EXT indicates the hole was extended from a previously drilled hole. 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: [email protected]
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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: [email protected]
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.
Figure 1 – Location Map of Drill Holes Completed in the 2025/2026 Field Season
Figure 2 – Hole ALD-26-036EXT in Cross Section
Figure 3 – Hole ALD-26-187DEXT, ALD-26-199EXT and ALD-26-259EXT in Cross Section
Figure 4 – Holes ALD-26-174EXT Cross Section