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Mexico
La India Mine

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 Location:
200 km E from Hermosillo, Sonora, Mexico

  Regional Office:
Blvd. Luis Encinas Johnson No. 604
Hermosillo
Sonora, Mexico
83204
Phone  ...  Subscription required
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
Processing
  • Heap leach
  • Carbon in column (CIC)
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life2025


Owners

Source: p. 36
CompanyInterestOwnership
Agnico Eagle Mines Ltd. 100 % Indirect

Deposit Type

  • Epithermal


Summary:

The mineral occurrences present and being sought in the Cieneguita and La India areas of the North Zone, as well as the Main Zone of the project area are volcanic-hosted, epithermal, high-sulphidation (HS) gold-silver deposits. Such deposits may be present as veins and/or disseminated deposits. Some of the most intensely studied and described HS deposits include Summitville, Colorado (Stoffregen, 1987; Gray and Coolbaugh, 1994), Goldfield, Nevada (Ransome, 1909; Ashley, 1974; Vikre, 1989), Lepanto, Philippines (Hedenquist et al., 1998) and Julcani, Peru (Petersen et al., 1977; Deen et al., 1994). Based on these studies and others, excellent compilations of general characteristics and genetic and empirical models have been presented by Hayba et al. (1985), Heald et al. (1987), Berger and Henley (1988) and Arribas (1995).

Numerous epithermal gold occurrences are exposed in small abandoned mines or exploration workings throughout the La India property. Host rocks include hydrothermal breccias, andesite, dacite porphyry, and volcaniclastic strata. Both high-angle structural and low-angle stratigraphic controls are observed. Mineralized zones are characterized by alteration mineral assemblages that include alunite, dickite and/or pyrophyllite, accompanied by intense silica replacement of the host rock, with variable intensities of pyritization and/or hematization. Pyrite occurs both as disseminations and in microveinlets. In oxidized zones, relict hematite-limonite-goethite after pyrite is present. In some occurrences, primary hypogene specularite is associated with auriferous zones. The mineral occurrences for which resources have been estimated, the North and Main Zones, are described herein. Other mineral occurrences are described in Gray (2006).

The gold mineralization is confined to zones of argillitic alteration originally containing sulphides and subsequently oxidized. All of La India’s reserves are in oxidized material, amenable to heap leaching.


Mining Methods

  • Truck & Shovel / Loader


Summary:

Operations at the La India mine use traditional open pit mining techniques with bench heights of six metres and utilize front end loaders, trucks, track drills and various support equipment. Based upon geotechnical evaluations, the final pit slopes vary between 46 degrees and 50 degrees.


Crushing and Grinding


Processing

  • Heap leach
  • Carbon in column (CIC)
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Source: Subscription required

Summary:

Three-stage crushing reduces the ore to 19 mm. Lime is added to the crushed ore to control the pH, and the ore is stacked in 8-metre-high lifts. The leach pad, which will be constructed in two phases, will have a capacity of up to 50 million dry tonnes, reaching an ultimate height of approximately 113 metres.

Cyanide leach solution percolates through the heap to the lined solution-collection ditch that routes it to a double-lined pregnant collection pond. A zero discharge water balance is maintained at the heap leach facilities with an event pond designed to contain the volume of solution that would be produced in the case of a 100-year/24-hour storm event.

The gold adsorption facility (ADR plant) consists of two parallel trains of five 3.5-tonne carbon adsorption columns and a Zadra strip with electrowinning. Gold-silver doré bars are produced in the refinery. The plant is designed to process leach flows from up to 6.0 million dry tonnes of ore per year (16,438 t ........

Recoveries & Grades:

CommodityParameter2020201920182017201620152014
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t 0.69 ^0.680.720.690.810.950.98
^ Guidance / Forecast.
Subscription required - Subscription is required.

Production:

CommodityUnits202020192018201720162015
Gold oz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required101,150115,162104,362
Silver koz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as payable metal. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202020192018201720162015
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required5,837,404 t5,371,419 t
Daily milling rate  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required15,949 t14,715 t
^ Guidance / Forecast.
Subscription required - Subscription is required.

Reserves at December 31, 2018:

CategoryTonnage CommodityGradeContained Metal
Proven 228 kt Gold 0.49 g/t 4 koz
Proven 228 kt Silver 3.73 g/t 27 koz
Probable 24,256 kt Gold 0.74 g/t 577 koz
Probable 24,256 kt Silver 2.54 g/t 1,981 koz
Proven & Probable 24,484 kt Gold 0.74 g/t 581 koz
Proven & Probable 24,484 kt Silver 2.55 g/t 2,008 koz
Measured 11,908 kt Gold 0.57 g/t 219 koz
Measured 11,908 kt Silver 3.2 g/t 1,227 koz
Indicated 2,774 kt Gold 0.53 g/t 47 koz
Indicated 2,774 kt Silver 4.44 g/t 396 koz
Measured & Indicated 14,682 kt Gold 0.57 g/t 267 koz
Measured & Indicated 14,682 kt Silver 3.44 g/t 1,623 koz
Inferred 1,761 kt Gold 0.53 g/t 30 koz
Inferred 1,761 kt Silver 3.37 g/t 191 koz

Commodity Production Costs:

CommodityUnits201920182017201620152014
Credits (by-product) Gold USD  ......  Subscription required  ......  Subscription required -54 / oz -73 / oz -39 / oz -45 / oz
Cash costs Gold USD  ......  Subscription required  ......  Subscription required 604 / oz 432 / oz 475 / oz 516 / oz
Total cash costs Gold USD  ......  Subscription required  ......  Subscription required 634 / oz 468 / oz 475 / oz 532 / oz
Total cash costs Gold USD  ......  Subscription required†  ......  Subscription required† 580 / oz† 395 / oz† 436 / oz† 487 / oz†
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

Units201920182017201620152014
Total operating costs ($/t milled) USD 131211998

Financials:

Units201920182017201620152014
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 23.4   22.7  
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 124.68   93.5  
Gross profit M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required -6.33   13.2  
Subscription required - Subscription is required


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jan 28, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 28, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 28, 2021
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2018
Subscription required 2017
Subscription required 2016
Subscription required 2015

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
Annual Information Form 2017
Annual Report 2017
Press Release 2017
Annual Report 2016
Form 40-F 2016
Annual Report 2015
Form 40-F 2015
Form 40-F 2014
Technical Report 2012
Subscription required - Subscription is required.

Aerial view:

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