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Argentina
Casposo Mine

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 Location:
110 km NW from San Juan, Argentina

  Regional Office:
Fray Mamerto Esquiú 304 (oeste)
San Juan
Argentina
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StatusCare and Maintenance
Mine TypeUnderground
Commodities
  • Gold
  • Silver
Mining Method
  • Longitudinal retreat
Production Start...
Mine Life2019
During the June 2019 quarter, Austral completed a comprehensive review of operations, and as the mine operator, decided to temporarily place the mine on care and maintenance.

The Casposo Mine continues to be on care and maintenance, although exploration activities commenced during the December 2019 quarter with the goal of recommencing processing operations.


Owners

Source: p. 11, 84
CompanyInterestOwnership
Austral Gold Ltd. 100 % Indirect
Austral Gold Limited owns 100% interest in Casposo mine through Casposo Argentina Ltd, wholly owned subsidiaries of Austral Gold Limited.

Contractors

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Deposit Type

  • Epithermal
  • Vein / narrow vein


Summary:

The deposits and other prospects within the Casposo property are examples of low-sulphidation epithermal deposition of gold and silver.

The Casposo gold–silver mineralization occurs in both the rhyolite and underlying andesite, where it is associated with banded quartz–chalcedony veins, typical of low sulphidation epithermal environments. Adularia in the main veins gives an age date of 280 ± 0.8 Ma (K/Ar), very close to the published age dates for the andesite unit. Post-mineralization dykes, of rhyolitic (Kamila), aphanitic-felsic and trachytic (Mercado) composition often cut the vein systems. These dykes, sometimes reaching up to 30 m thickness, are usually steeply dipping and north–south oriented.

Mineralization at Casposo occurs along a 10 km long west–northwest to east–southeast trending regional structural corridor, with the main Kamila Vein system forming a sigmoidal set 500 m long near the centre. The Mercado Vein system is the northwest continuation of Kamila, and is separated by an east–west fault from the Kamila deposit. A series of east–west striking veins (Cerro Norte and Oveja Negra systems) appear to splay off these major sets to the east and northeast. The Casposo mineralized district identified to date covers an area of approximately 100 km2.

KAMILA DEPOSIT
The gold–silver mineralization at the Kamila deposit is structurally controlled and occurs in crustiform-colloform quartz veins and stockworks in both andesite and ........


Mining Methods

  • Longitudinal retreat


Summary:

The Casposo Mine consists of a number of narrow steeply dipping orebodies known as Aztec, B-Vein, B-Vein 1, Inca 0, Inca 1, Inca 2A, Inca 2B, Mercado, and Julieta. Open pit mining in Kamila and Mercado pits was completed in 2013, and all mining is currently planned as underground, although there is potential for open pit mining at Julieta. The main production from the underground mine to date has been from Inca 1, Aztec, and Inca 2A.

The mining method used at Casposo is longitudinal longhole retreat. Mine production is made up of a combination of ore development through sill drifts (34%) and stope production (66%).

The veins are accessed by sub-level footwall drives, driven from the main ramp at 15 m intervals. Stopes were designed using a minimum mining width of 2 m and are 10.5 m high, while sill drifts were designed at 4.5 m high and on average 4.0 m to 5.0 m wide. Stope lengths vary depending on the orebody but are limited to a maximum of 15 m due to geotechnical constraints.

Mining progresses in a bottom up fashion. Stopes on each level are accessed in the middle and developed along strike, at both the top and bottom elevations. Once sill development is completed, the stopes are drilled and blasted. Drilling and blasting start at the end of the stoping blocks and mucked in retreating vertical slices.


Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityUnits201920182017
Gold oz  ......  Subscription required11,56416,793
Silver oz  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Equivalent oz  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in doré.
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Operational Metrics:

Metrics2019201820172016
Ore tonnes mined 33,318 t166,336 t
Tonnes processed 39,545 t181,242 t248,109 t
Daily processing capacity 1,100 t
Annual processing capacity 400,000 t

Reserves at December 31, 2019:
Mineral Resources are reported at a cut-off grade of 2 g/t AuEq
Mineral Reserves are estimated at a cut-off grade of 2.8 g/t AuEq and Development was evaluated at an incremental cut-off grade of 1.3 g/t AuEq

CategoryTonnage CommodityGradeContained Metal
Probable 608 kt Gold 2.4 g/t 46 koz
Probable 608 kt Silver 179 g/t 3,495 koz
Measured 37 kt Gold 2.4 g/t 3 koz
Measured 37 kt Silver 221 g/t 264 koz
Indicated 1,009 kt Gold 2.8 g/t 92 koz
Indicated 1,009 kt Silver 167 g/t 5,409 koz
Measured & Indicated 1,046 kt Gold 2.8 g/t 95 koz
Measured & Indicated 1,046 kt Silver 169 g/t 5,673 koz
Inferred 913 kt Gold 5.4 g/t 158 koz
Inferred 913 kt Silver 143 g/t 4,204 koz

Commodity Production Costs:

CommodityUnits201920182017
All-in sustaining costs (AISC) Gold Equivalent USD  ......  Subscription required 1,710 / oz   1,280 / oz  
C1 cash costs Gold Equivalent USD  ......  Subscription required 1,362 / oz   998 / oz  

Financials:

Units202120192018
Capital expenditures M USD  ......  Subscription required  ......  Subscription required 8.5  
Sustaining costs M USD  ......  Subscription required 8.3  
Revenue M USD  ......  Subscription required 37.7  
After-tax Income M USD  ......  Subscription required -34.8  
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Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 25, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 25, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 25, 2022
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Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
Annual Report 2018
Annual Report 2017
Technical Report 2016
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