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Ecuador
Mirador Mine

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 Location:
95 NE from Cuenca, Ecuador

  Regional Office:
Av. República de el Salvador 1082 y Av. Naciones Unidas
Quito
Ecuador
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WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Copper
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
Production Start...
Mine Life16.5 years (as of Jan 1, 2008)
Ecuador’s first large-scale open pit mining operation Mirador copper mine, in which Chinese copper smelter Tongling Non-ferrous owns a 70% stake, has been commissioned as of July 18, 2019.

Mine operations data has not been publicly available since then.


Owners

Source:
CompanyInterestOwnership
China Railway Construction Corporation Ltd. (CRCC) 30 % Indirect
Tongling Nonferrous Metals Group Co., Ltd. 70 % Indirect
The mine is held by Quito-based company EcuaCorriente SA (ECSA) which is part of a consortium called CRCC-Tongguan between two Chinese companies: Tongling Nonferrous Metals Group Holdings and China Railway Construction Corporation Ltd (CRRC) which also control the operating company China Railway Construction Copper Crown Investment Co Ltd.

Contractors

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Deposit Type

  • Porphyry


Summary:

The host rock, alteration, and mineralization at the Mirador deposit are characteristic of a calc-alkaline porphyry copper system. Copper deposits of a similar style are widespread in the Cordilleras of North and South America.

Most of the Mirador mineralization is exposed as weathered, leached laterite in the numerous drill trail and road exposures. Unevenly developed zones of supergene copper (and possibly silver) enrichment lie beneath a leached, lateritic “cap” with a relatively flat lower boundary. Thus this leached zone is thickest under ridge crests and nonexistent in any significant drainage bottom. Primary and supergene mineralization are only preserved in creek bottom outcrops, where the drainages have cut down through the overlying laterite.

The copper-gold-silver mineralization of the Mirador deposit is present mostly as disseminations and fine fracture-fillings of chalcopyrite, secondary chalcocite, and pyrite. Gold occurs as fine inclusions in chalcopyrite and pyrite, as well as native. Molybdenite is present in systems of early-stage quartz veins that have a preferred east-west orientation. These veins occur as stockwork in both Zamora granite and early porphyry dikes.

The sequence of mineral deposition at Mirador has been divided into early-stage molybdenum, early-stage copper ± gold, and late-stage copper-gold events, with a final weak polymetallic vein stage.


Mining Methods

  • Truck & Shovel / Loader


Summary:

The feasibility study is based on conventional open pit mining of the porphyry copper deposit. The deposit is covered by an average 22 m depth of overburden and a leached cap, a portion of which must be pre-stripped to access the orebody. The sulphide ore body is relatively homogenous, consisting dominantly of primary copper sulphides and is open at depth. Secondary enrichment is thinly developed in places over the primary sulphide mineralization.


Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityProductUnitsAvg. Annual (Projected)LOM (Projected)
Copper Payable metal M lbs 2,208
Copper Concentrate kt 2053,395
Gold Payable metal koz  ......  Subscription required
Silver Payable metal koz  ......  Subscription required
Copper Metal in concentrate M lbs 137
Gold Metal in concentrate koz  ......  Subscription required
Silver Metal in concentrate koz  ......  Subscription required
 * Projected daily production according to 2008 company report.


Reserves at December 31, 2009:
Resources are calculated at 0.4% copper cut-off.

CategoryTonnage CommodityGradeContained Metal
Measured 52,610,000 t Copper 0.65 % 753 M lbs
Measured 52,610,000 t Gold 0.21 g/t 360 koz
Measured 52,610,000 t Silver 1.6 g/t 2,770 koz
Indicated 385,060,000 t Copper 0.6 % 5,134 M lbs
Indicated 385,060,000 t Gold 0.19 g/t 2,380 koz
Indicated 385,060,000 t Silver 1.5 g/t 18,760 koz
Measured & Indicated 437,670,000 t Copper 0.61 % 5,887 M lbs
Measured & Indicated 437,670,000 t Gold 0.2 g/t 2,740 koz
Measured & Indicated 437,670,000 t Silver 1.5 g/t 21,530 koz
Inferred 235,400,000 t Copper 0.52 % 2,708 M lbs
Inferred 235,400,000 t Gold 0.17 g/t 1,250 koz
Inferred 235,400,000 t Silver 1.3 g/t 9,900 koz


Pipelines and Water Supply
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Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Feb 23, 2023
....................... Subscription required ....................... Subscription required Subscription required Feb 23, 2023
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Staff:

Total WorkforceYear
Subscription required 2021

Corporate Filings & Presentations:

DocumentYear
Annual Report 2018
Other 2010
Annual Information Form 2009
Feasibility Study Report 2008
Technical Report 2006
Feasibility Study Report 2005
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