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Argentina
Manantial Espejo Operation (COSE (Cap-Oeste Sur Este) Mine, Joaquin Mine)

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 Location:
141 km NW from San Julian, Argentina

  Regional Office:
Avenida Cordoba 836, 7th Floor
Buenos Aires
Argentina
C1054AAU
Phone  ...  Subscription required
Fax+54-11-5533-8768
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Silver
  • Gold
Mining Method
  • Mechanized Cut & Fill
  • Longhole stoping
  • Backfill
Processing
  • Dewatering
  • Smelting
  • Gravity separation
  • Filter press plant
  • Counter current decantation (CCD)
  • Concentrate leach
  • Agitated tank (VAT) leaching
  • Merrill–Crowe
  • Cyanide (reagent)
Mine Life2021
Company suspended its Manantial Espejo operations on March 23, 2020, and resumed on April 26, 2020.

The Manantial Espejo plant began processing ore mined from COSE in early September 2020.
Latest NewsPan American Silver Reports Ground Fall Accident and Suspension of Operations in Argentina     June 17, 2019


Owners

Source: p. 94
CompanyInterestOwnership
Pan American Silver Corp. 100 % Indirect
Ownership Tree

Deposit Type

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


Summary:

The mineralized deposits at the Manantial Espejo mine are predominantly veins with short strike slip and larger down dip displacement. The styles of mineralization include massive quartz veins, vein breccias, sheeted and stockwork veining, and minor dissemination. Gold occurs mainly as electrum in pyrite while the silver occurs in a number of forms including argentiferous galena and silver sulphosalts. Sulphides account for up to 3% to 5% ocount for up to 3% to 5% of the rock mass as veinlets and dissemination.

Mineralization at Manantial Espejo is hosted in four main veins known as Maria, Karina/Union, Melissa, and Concepcion. The majority of the mineralization out lined to date is in the Maria Vein. The vein is a thick silica vein exposed on surface fot more than one kilometre and has been intersected at a depth of up to 275 metres. This vein averages 7.8 metres in true wight and ranges from 0.63 metres to 20 metres and is open to the east and at depth. Economic grade mineralization of the vein is less continuous. Open pit economic grade zones measure tens to hundreds of metres in longitudinal dimention, with over 100 metres of vertical extent in the Maria West area.

The Karina/Union Vein is exposed on surface for a distance of 850 metres and has been drilled to a depth of 150 metres. Several interconnected high grade silver-gold epithermal veins in excess of 20 metres true wights have been observed in drillhole intersections.

The Melissa vein is thought to be the extensional component to the Maria shear system. The Melissa Vein has been defined by drill hole along a 300 metres strike lenght and 200 metres down dip and averages from between 1.5 and 2.5 metres wide.

The Concepción Vein is a single quartz vein. Mineralization occurs over a strike lenght of 600 metres and is open at depth and at both ends. The host rocks mineralogy and alteration are similar to the other veins on the property.


Mining Methods

  • Mechanized Cut & Fill
  • Longhole stoping
  • Backfill


Summary:

Ore was mined at Manantial Espejo using a combination of conventional open pit and underground mining methods until October 2017, when open pit mining ceased. All production now is from the underground mine and surface stockpiles. The underground mining operations consist primarily of long-hole and mechanized cut and fill mining methods utilizing development waste as backfill. The underground mine is expected to operate into 2021.


Crushing and Grinding
Crusher / Mill TypeModelSizePowerQuantity
SAG mill 1
Ball mill 2

Summary:

The primary crusher ore will be stored in the covered bin and ground in a combined SAG mill primary grinding circuit and a ball mill secondary grinding circuit.

The SAG mill operates in closed circuit with a single deck vibrating screen. A split of the SAG mill discharge screen undersize is pumped to the regrind circuit and the rest of the undersize is combined with the ball mill discharge. The screen oversize material will be transported by two conveyors to the pebble crushing system and the product returned to the SAG mill. The ball mill discharge combined with the rest of the SAG mill discharge screen undersize will be pumped to two hydro-cyclones with the oversize returned to the ball mill and the undersize feeding to the leaching circuit. The regrind circuit consists of a ball mill in a closed circuit with one hydrocylone. The product of the regrind circuit is leached in the concentrate leach circuit consisting of three 942 m 3 leach tanks.


Processing

  • Dewatering
  • Smelting
  • Gravity separation
  • Filter press plant
  • Counter current decantation (CCD)
  • Concentrate leach
  • Agitated tank (VAT) leaching
  • Merrill–Crowe
  • Cyanide (reagent)

Source: Subscription required

Summary:

Ore is treated by conventional crushing, semi-autogenous/ball mill grinding, bulk gravity concentration, intensive gravity concentrate agitation leaching, thickening, agitated cyanide leaching of the gravity tailings slurry, counter current decantation thickening, Merrill Crowe zinc precipitation, sulphur dioxide cyanide neutralization, conventional pulp tailings disposal, and conventional silver and gold doré bar production from melting of the Merrill Crowe precipitate. The nominal treatment rate at design capacity is 2,000 tpd of ore.

Recoveries & Grades:

CommodityParameter2020201920182017201620152014
Silver Head Grade, g/t  ......  Subscription required  ......  Subscription required135134143158157
Gold Head Grade, g/t  ......  Subscription required  ......  Subscription required1.421.882.943.312.82
Silver Recovery Rate, %  ......  Subscription required  ......  Subscription required8890.690.291.692.1
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required93.493.893.895.195.2

Production:
Manantial Espejo data includes production from the COSE and Joaquin mines.

CommodityUnits2021202020192018201720162015
Silver koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required3,0923,1233,1363,583
Gold koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202020192018201720162015
Tonnes milled  ......  Subscription required708.6 kt804.4 kt793.5 kt753.6 kt774.9 kt
Daily milling capacity  ......  Subscription required2,000 t2,000 t
Daily milling rate  ......  Subscription required2,150 t
Subscription required - Subscription is required.

Reserves at June 30, 2020:

CategoryTonnage CommodityGradeContained Metal
Proven 0.4 Mt Silver 240 g/t 3.2 M oz
Proven 0.4 Mt Gold 1.87 g/t 24.7 koz
Probable 0.5 Mt Silver 276 g/t 4.1 M oz
Probable 0.5 Mt Gold 2.89 g/t 42.4 koz
Measured 0.1 Mt Silver 213 g/t 0.9 M oz
Measured 0.1 Mt Gold 1.71 g/t 6.9 koz
Indicated 0.2 Mt Silver 229 g/t 1.4 M oz
Indicated 0.2 Mt Gold 2.95 g/t 17.8 koz
Inferred 0.6 Mt Silver 206 g/t 3.9 M oz
Inferred 0.6 Mt Gold 2.18 g/t 41.9 koz

Commodity Production Costs:

CommodityUnits2021202020192018201720162015
Cash costs (sold) Silver USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required† 14.8 / oz† 18.3 / oz† 4.28 / oz† 7.33 / oz†
All-in sustaining costs (sold) Silver USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required† 16.8 / oz† 23.4 / oz† -2.08 / oz† 18.8 / oz†
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.

Financials:

Units2021202020192018201720162015
Capital expenditures (planned) M USD  ......  Subscription required
Sustaining costs M USD  ......  Subscription required  ......  Subscription required2.8  
Capital expenditures M USD  ......  Subscription required  ......  Subscription required29.9   8.6   2.9   14.1  
Revenue M USD  ......  Subscription required  ......  Subscription required90.9   111.6   144   145  
Operating Income M USD  ......  Subscription required  ......  Subscription required-5.9  
Pre-tax Income M USD -44.1   -24.4   42.1   -75  
After-tax Income M USD -44.2   -25.5   41.7   -73.5  
Subscription required - Subscription is required


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required May 3, 2021
....................... Subscription required ....................... Subscription required Subscription required May 3, 2021
....................... Subscription required ....................... Subscription required Subscription required May 3, 2021
....................... Subscription required ....................... Subscription required Subscription required May 3, 2021
....................... Subscription required ....................... Subscription required Subscription required May 3, 2021
....................... Subscription required ....................... Subscription required Subscription required May 3, 2021
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Information Form 2018
Annual Report 2018
Press Release 2018
Year-end Mineral Reserves 2018
Annual Information Form 2017
Annual Report 2017
Annual Information Form 2016
Financial Review 2016
Management Discussion & Analysis 2016
Annual Report 2015
Management Discussion & Analysis 2015
Form 40-F 2014
Technical Report 2006
Subscription required - Subscription is required.

News:

NewsDate
Pan American Silver Reports Ground Fall Accident and Suspension of Operations in Argentina June 17, 2019

Aerial view:

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