Austral Gold Announces Updated Mineral Reserve and Resource Estimate for Casposo Mine
MEDIA RELEASE
Austral Gold Limited
ABN 30 075 860 472
Level 5, 137-139 Bathurst Street
Sydney NSW 2000
ASX: AGD | TSXV: AGLD
OTCQB: AGLDF
https://australgold.com
14 October 2025
Austral Gold Announces Updated Mineral Reserve and Resource Estimate
for Casposo Mine
HIGHLIGHTS
• Updated Mineral Resource and Reserve Estimate reinforces the Company’s strategy to
advance the Casposo Mine towards renewed production, complemented by the previously
announced Toll Milling Agreement with ASX-listed Challenger Gold Limited
• Proven and Probable Mineral Reserves for the Casposo Mine is estimated to be 2.149 Mt
grading 1.31 g/t Au and 58.52 g/t Ag and containing ounces recoverable of 80 thousand
ounces (Koz) Au and 3.276 M oz Ag
o Measured and Indicated Mineral Resources for the Casposo Mine are estimated to be
2.258 million tonnes (Mt) grading 1.48 g/t Au and 59.91 g/t Ag
o Inferred Mineral Resources are estimated to be approximately 0.173 Mt grading 7.52
g/t Au and 68.54 g/t Ag
• After-Tax Net Present Value (NPV) at 11.8% discount rate is US$72.7 million (US$2,855/oz
gold price)
o Undiscounted pre-tax free cash flows of US$137.9 million (post tax US$92.7 million).
o All-in Sustaining Cost (AISC): US$1,695/oz Au.
o The mine life is 74 months, based on Mineral Reserves.
o Estimated annual average production of 11,495 ounces recovered for gold and
468,434 ounces recovered for silver.
o Life of mine capital totals US$10.8 million, relate to sustaining capital for reprocessing
mineralized material from the development and construction of the stockpile ( DCS),
reclamation, and closure costs (offset by salvage value). No capital costs for open pit
operations as the Company has elected to utilize contract mining services.
o Average operating cost over the life of mine is US$85 per tonne milled or US$1,517
per gold equivalent ounce.
o Metallurgical recovery averages 88.0% for gold and 81.0% for silver over the LOM.
o Metal prices: Life of mine average of US$2,855/oz gold and US$ 35/oz silver, based
on consensus of independent forecasts for annual prices.
• *See tables below for assumptions used in the estimates
• **Only Measured and Indicated mineral resources are used in calculating the NPV
Austral Gold Limited (“Austral” or the “Company”) (ASX: AGD; TSX-V: AGLD; OTCQB: AGLDF), an
established gold producer, is pleased to announce the positive results of a Mineral Reserve and
Mineral Resource Estimate prepared internally in accordance with CIM Definitions 2014, National
Instrument 43-101 (“NI 43-101”) and Joint Ore Reserves Committee Code, 2012 (JORC 2012) with
respect to the Company’s 100% owned Casposo Operation in Argentina (the “Casposo
Operation”).
To support the Mineral Reserve and Mineral Resource Estimate, the Company is filing a technical
report prepared in accordance with NI 43 -101 on the ASX ( www.asx.com) and SEDAR +
(www.sedarplus.ca) today (the “Technical Report”).
Executive Officer of Austral, Stabro Kasaneva commented , “This mineral reserve estimate for
the Casposo Operation marks a significant step forward in our strategy to advance the project
towards production that has previously demonstrated its production capabilities. Since being placed
on care and maintenance in 2019, our team has worked diligently to reassess and strengthen the
technical and economic foundation of the project. The results of this reserve update reinforce our
confidence in the long-term potential of the asset.
We are especially encouraged by the timing of this announcement, as gold and silver prices remain
robust amid strong market fundamentals . This favorable pricing environment enhances the
economics of the project and positions us to deliver meaningful value to our shareholders."
The updated Mineral Reserve estimates are based on Company infill drilling and exploration activities
since the June 30, 2016 Technical Report filed on SEDAR+ and the Mineral Resource estimates are
based on the July 19, 2024 Technical Report filed on SEDAR+.
Total Mineral Resources Estimation Statement – as of June 30, 2025
Austral Gold Limited - Casposo Mine
Category Mass
Grade Ounces Contained Ounces Recovered
(000' t) (g/t
Au)
(g/t
Ag)
(g/t
AuEq)
(000’s
oz Au)
(000’s
oz Ag)
(000’s oz
AuEq)
(000’s
oz Au)
(000’s
oz Ag)
(000’s oz
AuEq)
Measured - - - - - - - - - -
Indicated 2,258 1.48 59.91 2.13 107 4,349 155 98 3,688 138
M&I 2,258 1.48 59.91 2.13 107 4,349 155 98 3,688 138
Inferred 173 7.52 68.54 8.28 42 381 46 38 323 42
Notes:
1) The Indicated Mineral Resources are inclusive of those Mineral Resources modified to produce the Mineral Reserves.
2) Stationary domains were modelled according to the lithological and structural continuity.
3) Mineral Resources were classified and reported in accordance with CIM Definition Standards and NI 43-101 requirements.
4) Indicated Resources were defined using a 25 m x 25 m drill grid in both strike and dip directions for ore mineralization. Stockpile
and DCS resources were defined based on operational history and sampling data.
5) Variable cut-off grades were applied by sector, based on spatial location and physical characteristics of the mineralized material:
Manantiales & Julieta: 1.24 g/t AuEq.
Mercado & B-Vein: 1.15 g/t AuEq.
Stockpile: 1.01 g/t AuEq.
DCS: 0.85 g/t AuEq.
6) The following bulk densities were applied for tonnage calculations:
2.5 t/m3 for open pit and underground domains
1.8 t/m3 for stockpiles
1.4 t/m3 for DCS material.
7) Mineral Resources were constrained by open -pit optimization, using metal prices of US$2,500 /oz for gold and US$27.5 /oz for
silver.
8) AuEq = (g/t) Au + (g/t) Ag / 90.91 [factor 90.91 = US$2,500 /oz for gold / US$27.5 /oz for silver.
9) Ounces Contained were not applied to metallurgical recoveries.
10) Ounces Recovered were applied to metallurgical recoveries by deposits.
11) Metallurgical recovery rates were applied by deposit, based on historical and test data.
Ore Mineral: 91.1% gold and 84.8% silver
Stockpiles: 89.0% gold and 85.8% silver
DCS: 86.9% gold and 78.5% silver
12) Totals may not sum exactly due to rounding.
Mineral Reserve Statement by deposit – as of June 30, 2025
Austral Gold Limited - Casposo Mine
Category Mass Grade Metallurgical Recovery Ounces Recovered
(000 t) (g/t Au) (g/t Ag) (% Au) (%Ag) (000 oz Au) (000 oz Ag)
Julieta
Proven - - - - - - -
Probable 161 5.01 24.10 91.1 84.8 24 106
Prov + Prob 161 5.01 24.10 91.1 84.8 24 106
Mercado - - - -
Proven - - - - - - -
Probable 92 1.73 150.60 91.1 84.8 5 378
Prov + Prob 92 1.73 150.60 91.1 84.8 5 378
Total Open Pit - - - -
Proven - - - - - - -
Probable 253 3.81 70.15 91.1 84.8 28 484
Prov + Prob 253 3.81 70.15 91.1 84.8 28 484
Stockpile - - - -
Proven - - - - - - -
Probable 1,507 0.88 52.95 86.9 78.5 37 2,013
Prov + Prob 1,507 0.88 52.95 86.9 78.5 37 2,013
All - - - -
Proven - - - - - - -
Probable 2,149 1.31 58.52 88.7 81.0 80 3,276
Prov + Prob 2,149 1.31 58.52 88.7 81.0 80 3,276
Notes:
1) Mineral Reserves were estimated using a gold price of US$2,200/oz and a silver price of US$25/oz.
2) Dilution was considered as 10% and Mining Recovery as 95%.
3) Variable cut-off grades were applied by sector, based on spatial location and physical characteristics of the mineralized
material:
Julieta: 1.303 g/t AuEq,
Mercado: 1.217 g/t AuEq,
Stockpile: 1.152 g/t AuEq,
DCS: 1.047 g/t AuEq
4) The following bulk densities were applied for tonnage calculations:
In-situ mine material: 2.5 t/m3
Stockpile material: 1.8 t/m3
DCS material:1.5 t/m3
5) Totals may not sum exactly due to rounding.
There are no known legal, political, environmental, or other risks that could materially affect the
potential development of mineral resources or mineral reserves.
TECHNICAL CONTENT AND QUALIFIED PERSONS
The Technical Report referenced in this news release was prepared under the supervision of the
following persons, each a non-Independent “Qualified Person” as defined by NI 43-101:
• Marcos Valencia, FAusIMM and Registered Member of the ChMC, Principal Geoscientist of
the Company;
• Guillermo Valdés, Registered Member of the Ch.M.C, Mining Engineer and Technical
Services Manager of the Company; and
• Francisco Pavez, Registered Member of the Ch.M.C, Metallurgical Civil Engineer and
Manager of Metallurgical Processes of the Company,
• (collectively, the “Qualified Persons”).
The scientific and technical information contained in this announcement has been extracted from
the Technical Report and has been reviewed and approved by the above Qualified Persons.
The Technical Report to support the updated Mineral Reserve and Mineral Resource estimates for
the Casposo Operation, prepared in accordance with NI 43 -101, will be filed with the ASX and on
SEDAR+ (www.sedarplus.ca) within 45 days of this news release.
COMPETENT PERSON’S STATEMENT
For the purposes of Listing Rule 5.22, the Company confirms that the updated Mineral Reserve and
Mineral Resource estimates for the Casposo Operation were based on work reviewed or compiled
by the Marcos Valencia, Guillermo Valdés and Francisco Pavez, each a non-independent “Qualified
Person” as defined by NI 43-101 and a “Competent Person” as defined in the JORC (2012) Code,
either as a Member of the Australian Institute of Geoscientists, or members in good standing of
Recognised Professional Organisations in Canada and the United States.
Each Competent Person is an employee of the Company.
Each Competent Person consents to the inclusion in this announcement of the matters based on
his information in the form and context in which it appears.
Each Competent Person has sufficient experience which is relevant to the style of mineralisation
and types of deposits under consideration and to the activities undertaken to qualify as a Competent
Person as defined in the JORC (2012) Code.
DATA VERIFICATION
All information contained in this news release was generated by Austral and was previously verified
in the technical report prepared by Marcos Valencia in 2024 and RPA in 2016. The scientific and
technical information included in the Technical Report, which forms the basis of this news release
disclosure, was reviewed by the Q ualified Persons who determined that the disclosure is in
accordance with the guidelines established by the CIM and falls under the requirements of NI 43 -
101 for publication to the market.
The data verification was carried out by taking the original information, comparing it with what was
reported in the 2016 technical report, and also reviewing the procedures that Austral applied during
its drilling and quality assurance activities.
All information captured and processing procedures and protocols have been developed to detect
deviations in the early stages of the process and to apply corrective measures for mitigation and
to minimize the source of risk of failures in the information generated and declared as public.
A site visit was undertaken by each of the Qualified Persons . However, it was not possible to
oversee the drilling procedures and processes for data collection. Each of the Qualified Persons
reviewed the protocols and procedures and determined that are in line with industry standards.
Analytical laboratories for the project have not been inspected at this stage. A thorough Quality
Assurance and Quality Control (“QA/QC”) program adhering to internationally accepted standards
were completed for Austral drilling over the past phases. Each of the Qualified Persons is satisfied
with the methods employed for internal data validation and for the purpose of the mineral resource
estimate.
The Qualified Person , Marco s Valencia considers that the sample preparation, security, and
analytical procedures adopted for the resource drilling provide an adequate basis for the current
mineral resource estimate and that the QAQC program and procedures developed by the Austral
geology team and reviewed by each of the Qualified Persons are adequate. The data contained in
the drill hole database were generated and collected according to the industrial standards and
Austral applied proper programs to keep the security of the data developed by the Austral geology
team and reviewed by each of the Qualified Persons.
FURTHER INFORMATION
For the purposes of listing Rule 5.9.1, the Company wishes to provide a summary of the material
assumptions and outcomes of the Technical Report that was used to upgrade the mineral resources to
ore reserves. This information is to be read together with the JORC (2012) Code Table 1 Report.
1. The mineralised domains evaluated for the mineral resource estimation were interpreted by the
Casposo geology team using a lithological model in Leapfrog and a set of cross-vertical sections
were used to guide the 3D modelling for veins, breccias, stockwork or veinlets mineralization
domains developed in Vulcan software.
2. Drill hole spacing at the mine generally ranges from 12.5 m x 12.5 m to 60 m x 60 m. Given the
density of drilling at the Casposo Mine, a 25 m by 25 m grid pattern has been established to
classify resources as Indicated. This pattern, aligned with the vein main vein plane, allows for the
definition of geological continuity with an acceptable level of risk for resource estimation.
3. Benchmarking was conducted using comparable deposits in Argentina, Peru and Chile, where a
broader grid pattern, typically 30 m x 30 m is commonly used to classify Indicated resources.
Formal studies to determine the optimal grid spacing are recommended, and the Qualified
Person suggests initiating such studies. Resources can only be classified as Measured when the
vein is exposed; however no Measured resources were defined in this estimation process.
4. All the resources located outside the established grid pattern have been classified as Inferred.
5. Based on the available data, benchmarking results, and the expert judgment of the Qualified
Person (QP), a 25-meter x 25-meter drill grid pattern was adopted to define Indicated Resources
for the Manantiales, Julieta, Mercado, and B-Vein deposits.
6. Metal prices used for the estimation are US$2,500 per ounce of gold and US$27.50 per ounce of
silver.
Mineral Resource Statement by deposit – Inclusive Reserves – as of June 30, 2025
Austral Gold Limited - Casposo Mine
Category Mass Grade Ounces Contained Ounces Recovered
(000' t) (g/t Au) (g/t Ag) (g/t
AuEq)
(000's
oz Au)
(000's oz
Ag)
(000's oz
Aueq)
(000's
oz Au)
(000's
oz Ag)
(000's oz
Aueq)
Manantiales
Measured - - - - - - - - - -
Indicated 22 4.31 24.28 4.58 3.0 17 3.2 3 15 2.9
M + I 22 4.31 24.28 4.58 3.0 17 3.2 3 15 2.9
Inferred 9 9.04 34.51 9.42 2.5 10 2.7 2 8 2.4
Julieta
Measured - - - - - - - - - -
Indicated 166 5.46 25,99 5.75 29,2 139 30.7 27 118 27.9
M + I 166 5.46 25,99 5.75 29,2 139 30.7 27 118 27.9
Inferred 98 10.48 18.59 10.68 32.9 58 33.6 30 50 30.6
Mercado
Measured - - - - - - - - - -
Indicated 103 2.50 134.91 3.98 8.3 447 13.2 8 379 11.7
M + I 103 2.50 134.91 3.98 8.3 447 13.2 8 379 11.7
Inferred 36 2.89 30.53 3.23 3.3 35 3.7 3 30 3.4
B-Vein
Measured - - - - - - - - - -
Indicated 56 3.63 137.05 5.14 6.6 249 9.3 6 211 8.3
M + I 56 3.63 137.05 5.14 6.6 249 9.3 6 211 8.3
Inferred 30 3.05 283.33 6.17 3.0 277 6.0 3 235 5.3
Total Open Pit
Measured - - - - - - - - - -
Indicated 348 4.21 76.21 5.05 47 852 56 43 723 51
M + I 348 4.21 76.21 5.05 47 852 56 43 723 51
Inferred 173 7.52 68.54 8.28 42 381 46 38 323 42
Stockpile
Measured - - - - - - - - - -
Indicated 389 1.36 72.54 2.16 17.0 907 27.0 16 769 24.0
M + I 389 1.36 72.54 2.16 17.0 907 27.0 16 769 24.0
Inferred - - - - - - - - - -
DCS
Measured - - - - - - - - - -
Indicated 1,521 0.88 52.95 1.50 43.0 2,589 71.4 39 2,196 63.3
M + I 1,521 0.88 52.95 1.50 43.0 2,589 71.4 39 2,196 63.3
Inferred - - - - - - - - - -
ALL
Measured - - - - - - - - - -
Indicated 2,258 1.48 59.91 2.13 107 4,349 155 98 3,688 138
M + I 2,258 1.48 59.91 2.13 107 4,349 155 98 3,688 138
Inferred 173 7.52 68.54 8.28 42 381 46 38 323 42
Notes:
1) The Indicated Mineral Resources are inclusive of those Mineral Resources modified to produce the Mineral Reserves.
2) Stationary domains were modelled according to the lithological and structural continuity.
3) Mineral Resources were classified and reported in accordance with CIM Definition Standards and JORC (2012) requirements.
4) Indicated Resources were defined using a 25 m x 25 m drill grid in both strike and dip directions for ore mineralization. Stockpile and DCS
resources were defined based on operational history and sampling data.
5) Variable cut-off grades were applied by sector, based on spatial location and physical characteristics of the mineralized material:
Manantiales & Julieta: 1.24 g/t AuEq.
Mercado & B-Vein: 1.15 g/t AuEq.
Stockpile: 1.01 g/t AuEq.
DCS: 0.85 g/t AuEq.
6) The following bulk densities were applied for tonnage calculations:
2.5 t/m3 for open pit and underground domains
1.8 t/m3 for stockpiles
1.4 t/m3 for DCS material.
7) Mineral Resources were constrained by open -pit optimization, using metal prices of US$2,500 /oz for gold and US$27.5 /oz for silver.
8) AuEq = (g/t) Au + (g/t) Ag / 90.91 [factor 90.91 = US$2,500 /oz for gold / US$27.5 /oz for silver]
9) Ounces Contained were not applied to metallurgical recoveries.
10) Ounces Recovered were applied to metallurgical recoveries by deposits.
11) Metallurgical recovery rates were applied by deposit, based on historical and test dat.
Ore Mineral: 91.1% gold and 84.8% silver
Stockpiles: 89.0% gold and 85.8% silver
DCS: 86.9% gold and 78.5% silver
12) Totals may not sum exactly due to rounding.
Metallurgical Operating Recoveries used in the Resource and Reserve Mineral Estimate - June 30, 2025
Austral Gold Limited - Casposo Mine
Deposit Metallurgical Recovery
Au (%) Ag (%)
Manantiales 91.1 84.8
Julieta 91.1 84.8
Mercado 91.1 84.8
B-Vien 91.1 84.8
Stockpile 89.0 85.8
DCS 86.9 78.5
About Austral Gold
Austral Gold is a gold and silver mining producer building a portfolio of quality assets in the
Americas based on three strategic pillars: production, exploration and equity investments. Austral
continues to lay the foundation for its growth strategy by advancing its attractive portfolio of
producing and exploration assets.
For more information, please visit the Company’s website at www.australgold.com.
Neither TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the
policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this
release.
Release approved by the Company’s Chief Executive Officer of Austral Gold, Stabro Kasaneva.
For additional information please contact:
David Hwang Jose Bordogna
Joint Company Secretary Chief Financial Officer and Joint Company Secretary
Austral Gold Limited Austral Gold Limited
[email protected] [email protected]
+61 433 292 290 +61 466 892 307
Forward Looking Statements
Statements in this news release that are not historical facts are forward-looking statements. Forward-
looking statements are statements that are not historical, and consist primarily of projections and
statements regarding future plans, expectations and developments. Words such as "expects",
"intends", "plans", "may", "could", “potential”, "should", "anticipates", "likely", "believes" and words of
similar expressions are in tended to identify forward -looking statements. The forward-looking
statement in this news release include, but are not limited to, all projections with respect to the
Casposo Operation including Mineral Reserve and Mineral Resource estimates, all projected and
future economic statements with respect to the Casposo Operation, all projections related to future
project advancement , including to production, and expected production levels, operational
performance, financial outcomes and strategic growth.
All of these forward -looking statements are subject to a variety of known and unknown risks,
uncertainties and other factors that could cause actual events or results to differ from those expressed
or implied, including, without limitation, uncertainty of exploration programs, development plans and
cost estimates, commodity price fluctuations; political or economic instability and regulatory changes;
currency fluctuations, the state of the capital markets, uncertainty in the measurement of mineral
resources and reserves; and other risks and hazards related to the explo itation and development of
mineral properties, as well as the availability of capital. You are cautioned that the foregoing list is not
exhaustive of all factors and assumptions which may have been used. Austral cannot assure you that
actual events, performance or results will be consistent with these forward -looking statements, and
management’s assumptions may prove to be incorrect. Austral’s forward -looking statements reflect
current expectations regarding future events and operating performance and speak only as of the
date hereof and Austral does not assume any obligation to update forward -looking statements if
circumstances or management’s beliefs, expectations or opinions should change othe r than as
required by applicable law. For the reasons set forth above, you should not place undue reliance on
forward-looking statements.