Austral Gold Updates Mineral Reserve and Resource Estimates in Chile

Sydney, Australia–(Newsfile Corp. – March 28, 2022) – Austral Gold Limited (ASX: AGD) (TSXV: AGLD) (“Austral” or the “Company“)is pleased to announce the positive results of updated Mineral Reserve and Mineral Resource Estimates prepared by SLR Consulting (Canada) Ltd. (“SLR“) in accordance with CIM Definitions 2014, National Instrument 43-101 (“NI 43-101“) and Joint Ore Reserves Committee Code, 2012 (JORC 2012) for the Company’s 100% owned Guanaco-Amancaya Operation in Chile. The Guanaco-Amancaya Operation consists of the Guanaco Mine (Guanaco) and Inesperada satellite deposit (Inesperada), the Amancaya Mine (Amancaya), and the Guanaco heap leach pads (Heap Reprocessing project). The updated Mineral Reserve and Mineral Resource estimates will be supported by a technical report prepared in accordance with NI 43-101 that will be filed on SEDAR (www.sedar.com) within 45 days of this news release (the “Technical Report“).

Highlights:

• Proven and Probable Mineral Reserves for the Guanaco-Amancaya Operation are estimated to be 12.1 Mt grading 0.84 g/t Au and 4.89 g/t Ag and containing 0.326 million ounces (Moz) Au and 1.91 M oz Ag. The Heap Reprocessing material provides the majority of the increase from previous estimates.

• Measured and Indicated Mineral Resources for the Guanaco-Amancaya Operation are estimated to be 14.9 million tonnes (Mt) grading 1.03 g/t Au and 5.89 g/t Ag

• Inferred Mineral Resources are estimated to be approximately 2.4 Mt grading 1.18 g/t Au and 3.93 g/t Ag

• After-Tax Net Present Value (NPV) at 6.89% discount rate is US$77.0 million

• Undiscounted pre-tax free cash flows of US$132.7 million (post tax US$102.6 million)

• All-in Sustaining Cost (AISC): US$1,050/oz Au

• The mine life is 12 years, based on Mineral Reserves.

• Combined estimated annual average production of 17,400 ounces recovered for gold and 52,800 ounces recovered for silver

• Mine life capital totals US$20.9 million, consisting of installation of a new crusher and heap leach pad for heap reprocessing, capitalized waste stripping, and closure costs (offset by salvage value).

• Average operating cost over the mine life is $17.51 per tonne milled.

• Metallurgical recovery averages 60.4% for gold and 31.7% for silver over the LOM (the average is highly influenced by the Heap Reprocessing material, higher-grade feed has higher recoveries).

• Metal prices: Life of Mine (“LOM”) average of US$1,686/oz gold and US$22.88/oz silver, based on consensus of independent forecasts for annual prices.

*See tables below for assumptions used in the estimates.

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Chief Executive Officer of Austral, Stabro Kasaneva, commented, “We are excited at the prospect of continuing to increase shareholder value by extending the mine life of Guanaco-Amancaya. The Heap Reprocessing project is expected to utilize excess processing capacity to provide a solid long-term basis for mine operations, covering costs and providing a return at current financial inputs. Opportunities for higher-grade ore sources from exploration or acquisition could be easily integrated into the Life of Mine plan, and would benefit from lower unit costs.”

The updated estimates are based on Company infill drilling and exploration activities since the December 31, 2016 Technical Report filed on SEDAR, as well as metallurgical testwork and engineering studies on the Heap Reprocessing project.

Mining at Guanaco was discontinued in February 2020. Amancaya is currently in production, while Guanaco Heap Reprocessing and Inesperada are new projects that are anticipated to commence operations in 2023. Amancaya’s Mineral Reserves are expected to be exhausted in 2023 when Inesperada commences production. It is anticipated that the Inesperada open pit Mineral Reserves will be exhausted by the end of 2025. Reprocessing of the heaps is scheduled to commence in 2023 and continue through to the end of mine life in 2033. Heaps I, II, and III are expected to be reprocessed in reverse order of their numbering, beginning with Heap III, continuing with Heap II, and finishing with Heap I. Approximately 15% of the Mineral Reserve contained ounces comes from Amancaya, 68% from Heaps Reprocessing, and 17% from Inesperada.

Summary of Mineral Resources – December 31, 2021
Austral Gold Limited- Guanaco-Amancaya Operation

Notes:

1. Mineral Resources followed CIM (2014) definitions and are compliant with the JORC Code.

2. Mineral Resources are reported on a 100% ownership basis.

3. Mineral Resources are inclusive of Mineral Reserves.

4. Mineral Resources that are not Mineral Reserves do not have demonstrated economic viability.

5. Mineral Resources are estimated at the following cut-off grades:

   1. Amancaya and Guanaco underground Mineral Resources: 2.90 g/t AuEq and 1.50 g/t AuEq, respectively.

   2. Inesperada open pit Mineral Resources: 0.38 g/t Au.

   3. Heap Leach Pads Mineral Resources: zero cut-off grade – the entire volume is included.

6. Mineral Resources at Guanaco and Amancaya are estimated using a long-term gold price of US$1,750/oz and a silver price of US$22/oz. Mineral Resources at Inesperada and Heap Leach Pads are estimated using a long-term gold price of US$1,750/oz.

7. Gold equivalency (AuEq) was calculated as follows:

   1. Guanaco: AuEq = Au + 0.0106 x Ag based on a gold and silver price of $1,750/oz and $22/oz respectively and recoveries of gold and silver of 95% and 80%, respectively.

   2. Amancaya: AuEq = Au + 0.0107 x Ag based on a gold and silver price of $1,750/oz and $22/oz respectively and recoveries of gold and silver of 93% and 79%, respectively.

8. Metallurgical recoveries are 93% for gold and 79% for silver for Amancaya, 95% for gold and 80% for silver for Guanaco, 80% for gold for Inesperada, and 54%, 70%, and 46% for gold for Heaps I, II, and II, respectively.

9. A minimum mining width of 1.5 m is used for resource underground shapes for the Amancaya and Guanaco mines.

10. Bulk densities are 2.5 t/m³ for Amancaya and Guanaco, 2.44 t/m³ for Inesperada, and 1.77 t/m³ for Heap I, 1.50 t/m³ for Heap II, and 1.70 t/m³ for Heap III, respectively.

11. Numbers may not add due to rounding.

Guanaco-Amancaya Operation Mineral Reserves – December 31, 2021
Austral Gold Limited- Guanaco-Amancaya Operation

Notes:

1. Mineral Reserves follow CIM (2014) definitions and are compliant with the JORC Code.

2. Mineral Reserves are reported on a 100% ownership basis and estimated at the following cut-off grades:

   1. Amancaya: break-even cut-off grade of 3.04 g/t AuEq, and marginal cut-off grades of 2.37 g/t AuEq and 1.37 g/t AuEq for SLS stopes and drifts respectively.

   2. Inesperada – pit discard cut-off grade of 0.40 g/t Au.

   3. Heap Leach Pads – Marginal cut-off grades for Heap Reprocessing have been estimated as 0.20 g/t Au and 0.15 g/t Au for Heaps I and Heap II respectively, and at zero cut-off for Heaps III.

3. Mineral Reserves are estimated using an average long term gold price of US$1,700/oz and silver price of US$22/oz.

4. Amancaya AuEq was calculated as AuEq = Au + 0.0110 x Ag, based on prices of US$1,700/oz Au and US$22/oz Ag and recoveries of Au and Ag of 93% and 79%, respectively.

5. The following parameters were used for the Amancaya Mineral Reserve estimate:

   1. A minimum mining width of 1.5 m was used for SLS stopes and 3.5 m for drifts.

   2. Stope dilution: 0.5 m in the hanging wall and 0.5 m in the footwall (1.0 m total).

   3. Drift dilution: 0.25 m in each of the side walls (0.5 m total).

6. Metallurgical recovery is 93% for gold and 79% for silver.

7. Bulk density is 2.5 t/m³.

8. The following parameters were used for the Inesperada Mineral Reserve estimate:

   1. Dilution and mining recovery factors of 0% and 100% respectively were applied.

   2. Metallurgical recovery is 80% for gold.

   3. Bulk density is 2.44 t/m³.

9. The following parameters were used for the Mineral Reserve estimate for the Guanaco Heaps:

   1. Heap Leach Pad I: maximum of 5% dilution. The average dilution over the LOM is 3.5%. Dilution grades are 0.18 g/t Au and 1.50 g/t Ag.

   2. Heap Leach Pad II: maximum of 5% dilution. The average dilution over the LOM is 2.5%. Dilution grades are 0.13 g/t Au and 1.40 g/t Ag.

   3. Heap Leach Pad III: All internal dilution within the heap limits was included.

10. Metallurgical recoveries for Heaps I, II, and II are 54%, 70%, and 46% for gold respectively.

11. Bulk density is 1.77 t/m³ for Heap I, 1.50 t/m³ for Heap II, and 1.70 t/m³ for Heap III.

12. Numbers may not add due to rounding.

There are no known legal, political, environmental, or other risks that could materially affect the potential development of the mineral resources or mineral reserves.

TECHNICAL CONTENT AND QUALIFIED PERSONS

The Technical Report for the Guanaco-Amancaya Operation referenced in this news release was prepared under the supervision of the following persons,…