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Argentina
San Jose Mine

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 Location:
48 km E from Perito Moreo, Argentina

  Address:
Route 43 10 km west of Pluma Loc. Lake Buenos Aires, E / Perito Moreno and Las Heras
Santa Cruz
Argentina
9040
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Fax+54-0297-440-2126
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
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  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Silver
  • Gold
Mining Method
  • Mechanized Cut & Fill
  • Cemented backfill
Production Start...
Mine Life5 years (as of Jan 1, 2021)


Owners

Source: p. 80
CompanyInterestOwnership
McEwen Mining Inc. 49 % Indirect
Hochschild Mining Plc. 51 % Indirect
Minera Santa Cruz S.A (operator) 100 % Direct
McEwen Mining Inc. owns a 49% interest in Minera Santa Cruz S.A. (“MSC”), owner of the producing San José silver-gold mine in Santa Cruz, Argentina, which is operated by the joint venture majority owner, Hochschild Mining plc.

Contractors

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Deposit Type

  • Epithermal
  • Vein / narrow vein
  • Breccia pipe / Stockwork


Summary:

Mineralization in the vicinity of the Property occurs as LS epithermal quartz veins, breccias and stockwork systems accompanying normal-sinistral faults striking 330° to 340° and conjugate dextral faults. Most of the known mineralization at the Property is hosted by the Jurassic Bajo Pobre and Chon Aike Formations.

Regional exploration has identified numerous vein targets, of which five, Huevos Verdes, Frea, Kospi, Ayelén and Odin have been extensively explored by surface diamond drilling and subsequently developed by underground mining.

After reviewing the various drilling programs, Colquhoun et al. (2007) concluded the Frea and Kospi Veins were the most significant zones in terms of grade and tonnage. The mineralized Frea has been traced over a 1,200 m strike length and to depths of up to 250 m, with an average width of up to 2.5 m (Colquhoun et al. 2007, Minera Andes News Release, September 2, 2008). The Kospi Vein has been traced for over 1,300 m strike length (Mach and Elliott 2009) and to depths of up to 230 m, with an average width of around 3.0 m.

Huevos Verdes
The Huevos Verdes vein system is one of the most important targets on the Property consisting of three to four discontinuous zones: Huevos Verdes Norte (“HVN”), Huevos Verdes Sur (“HVS”), Huevos Verdes Centro (“HVC”) and Huevos Verdes Ramal (“HVR”). The system is comprised of an array of sub-parallel veins striking 325° with dips ranging between 45° and 75° to the northeast ........


Mining Methods

  • Mechanized Cut & Fill
  • Cemented backfill


Summary:

San José is currently a ramp access underground mining operation. The San José veins are accessed from three main portals: The Tehuelche Portal, the Kospi Portal and the Güer Aike Portal. Initially two small inclined shafts were developed to provide access to the HVS and HVN veins. These shafts are now used to supplement the primary ventilation circuit. Main ramps are generally 4.0 m wide by 4.3 m high at a 12 % gradient on the straight sections and 10.5 % on the curves. A smaller profile is used in areas where truck access is not required. The main ramps are located about 50 m from the veins, depending on the dip of the ore. Cross-cuts to the ramp are centrally positioned on the vein and usually have an ore pass and a waste backfill pass.

The average mining width across all of the vein systems is approximately 2m. The dip of the veins varies from 55º to 70º. Mechanized Cut and Fill mining using scoop trams, and jacklegs (pneumatic rock drills) or single-boom jumbos, respectively, is utilized at San José. The majority of production ore is derived from the “uphole retreat” mining technique where a panel of approximately 50m in length is drilled with upholes and retreated along strike. Horizontal “breasting” is only used on the initial lift in each stope. A “resue” mining technique is employed in narrow high grade areas. Stoping areas are separated by 3 m high sill pillars. A timber floor mat, for narrow stopes, or cemented backfill, for wider stopes, is placed on th ........


Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityUnits2022202120202019201820172016
Silver koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required6,1656,4486,691
Gold koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Equivalent koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Equivalent koz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in conc./ doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019201820172016
Ore tonnes mined  ......  Subscription required  ......  Subscription required554 kt527 kt527 kt533 kt
Tonnes processed  ......  Subscription required  ......  Subscription required544 kt556 kt533 kt536 kt
Daily processing capacity  ......  Subscription required  ......  Subscription required1,650 t1,650 t1,650 t1,650 t
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Reserves at December 31, 2021:
Resources reporting Cut-off: 240 g/t AgEq; For Reserves AgEq Cut-offs: cut & fill 269 g/t AgEq., long hole 191 g/t AgEq.

CategoryTonnage CommodityGradeContained Metal
Proven 778 kt Silver 368 g/t 9.2 M oz
Proven 778 kt Gold 5.69 g/t 142 koz
Probable 716 kt Silver 314 g/t 7.2 M oz
Probable 716 kt Gold 5.68 g/t 131 koz
Proven & Probable 1,494 kt Silver 342 g/t 16.5 M oz
Proven & Probable 1,494 kt Gold 5.69 g/t 273 koz
Measured 114 kt Silver 310 g/t 1.2 M oz
Measured 114 kt Gold 5.09 g/t 18.7 koz
Indicated 100 kt Silver 204 g/t 0.6 M oz
Indicated 100 kt Gold 2.41 g/t 8.2 koz
Measured & Indicated 216 kt Silver 260 g/t 1.8 M oz
Measured & Indicated 216 kt Gold 3.84 g/t 26.9 koz
Inferred 1,839 kt Silver 332 g/t 19.6 M oz
Inferred 1,839 kt Gold 5.22 g/t 308.4 koz

Commodity Production Costs:

CommodityUnits2022202120202019201820172016
Total cash costs (sold) Silver USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 10.1 / oz   10.5 / oz   9.7 / oz  
Total cash costs (sold) Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Total cash costs (sold) Silver USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†
Total cash costs (sold) Gold USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†
All-in sustaining costs (AISC) Gold Equivalent USD  ......  Subscription required&nbs  ......  Subscription required  ......  Subscription required  ......  Subscription required 1,071 / oz   1,036 / oz   851 / oz  
All-in sustaining costs (AISC) Silver Equivalent USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 14.5 / oz   14 / oz   11.5 / oz  
^ Guidance / Forecast.
† Net of By-Product.
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Operating Costs:

Units2021202020192018201720162015
Total operating costs ($/t milled) USD 229199.4219.2218.6240.1202.4210.4

Financials:

Units202120202019201820172016
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 44.6   36.3   35.3  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 205.4   227.1   236  
Gross profit M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 28.3   49.8   67.6  
Operating Income M USD  ......  Subscription required 20.3   43.2   57.3  
Pre-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 20.3   43.2   57.3  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 20.3   43.2   57.3  
Subscription required - Subscription is required



Heavy Mobile Equipment as of December 31, 2013:
HME TypeModelSizeQuantity
Drill jumbo (single boom) ....................... Subscription required ....................... Subscription required
Drill jumbo (single boom) ....................... Subscription required ....................... Subscription required
Drill jumbo (single boom) ....................... Subscription required ....................... Subscription required
Drill jumbo (single boom) ....................... Subscription required ....................... Subscription required
Drill jumbo (single boom) ....................... Subscription required ....................... Subscription required
Drill jumbo (single boom) ....................... Subscription required ....................... Subscription required
Scoop Tram ....................... Subscription required ....................... Subscription required
Scoop Tram ....................... Subscription required ....................... Subscription required
Scoop Tram ....................... Subscription required ....................... Subscription required
Scoop Tram ....................... Subscription required ....................... Subscription required
Scoop Tram ....................... Subscription required ....................... Subscription required
Truck (haul) ....................... Subscription required 20 t ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Mar 24, 2022
....................... Subscription required ....................... Subscription required Subscription required Mar 24, 2022
....................... Subscription required ....................... Subscription required Subscription required Mar 24, 2022
....................... Subscription required ....................... Subscription required Subscription required Mar 24, 2022
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2019

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2022
Fact Sheet 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Corporate Presentation 2018
Form 10-K 2018
Press Release 2018
Annual Report 2017
Corporate Presentation 2017
Form 10-K 2017
Annual Report 2016
Corporate Presentation 2016
Press Release 2016
Annual Report 2015
Technical Report 2013
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Subscription required - Subscription is required.

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