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Ecuador
Mirador Mine

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 Location:
96 NE from Cuenca, Ecuador

  Regional Office:
Av. República de el Salvador 1082 y Av. Naciones Unidas
Quito
Ecuador
Phone  ...  Subscription required
Fax593-2-3972002
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
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  • Reserves
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  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Copper
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
Processing
  • Flotation
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.


Owners

 
CompanyInterestOwnership
China Railway Construction Corporation Ltd. (CRCC) 30 % Indirect
Tongling Nonferrous Metals Group Co., Ltd. 70 % Indirect
On December 28, 2009, Corriente Resources Inc. announced that it had signed a definitive agreement (the “Support Agreement”) with CRCC-Tongguan Investment Co., Ltd. (the “Offeror”), Tongling Nonferrous Metals Group Holdings Co., Ltd. ("Tongling") and China Railway Construction Corporation Limited ("CRCC"), under which the Offeror has agreed to make an offer to acquire all of the company’s outstanding shares (the “Offer”) for $8.60 per share in cash, equivalent to approximately $679 million on a fully-diluted basis. On May 31, 2010, the Offeror pursuant to its offer dated February 1, 2010 to purchase all of the issued and outstanding common shares (the "Common Shares") of the Corporation, acquired 76,478,495 Common Shares representing approximately 96.9% of the issued and outstanding Common Shares on a fully diluted basis. On August 4, 2010, the Offeror acquired an additional 2,443,898 Common Shares.

Deposit Type

  • Porphyry


Summary:

The host rock, alteration, and mineralization at the Mirador deposit are characteristic of a calcalkaline 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
Flow Sheet: Source


Processing

  • Flotation

Flow Sheet: Subscription required

Summary:

Run-of-mine ore will be crushed in a gyratory crusher. The mill flow sheet selected for Mirador will be a conventional copper-gold porphyry flowsheet, with relatively coarse primary semiautogenous and ball mill grinding to about 150 µm followed by copper rougher flotation, concentrate regrind to 30 µm, and cleaner flotation and dewatering. Concentrates produced are predicted to average 29.8% copper at a recovery of 91%. Gold recovery is expected to average 47%. A laboratory analysis of concentrates indicated that no significant deleterious penalty element impurities are present. The concentrate will be trucked via the existing road network in the area to a port facility in Machala for shipment to smelters. Tailings from the process will be impounded in a zero discharge tailings pond; water will be reclaimed from the tailings pond and reused in the process.

CommodityParameter
Gold Recovery Rate, %
Gold Head Grade, g/t
Gold Concentrate Grade, g/t
Silver Recovery Rate, %
Silver Head Grade, g/t
Silver Concentrate Grade, g/t

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:

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


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Oct 6, 2021
....................... Subscription required ....................... Subscription required Subscription required Oct 6, 2021
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
Annual Report 2018
Other 2010
Annual Information Form 2009
Feasibility Study Report 2008
Technical Report 2006
Feasibility Study Report 2005
Subscription required - Subscription is required.

Aerial view:

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