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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
  • Smelting
  • Crush & Screen plant
  • Heap leach
  • Carbon in column (CIC)
  • Elution
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life2023


Owners

Source: p. 35, 37
CompanyInterestOwnership
Agnico Eagle Mines Ltd. 100 % Indirect
The La India mine is owned by the Agnico Eagle's indirect subsidiary, Agnico Sonora, S.A. de C.V.

Deposit Type

  • Epithermal


Summary:

The La India mine lies within the Sierra Madre Occidental province, an extensive Eocene to Miocene volcanic field extending from the United StatesMexico border to central Mexico. The La India mine lies within the western limits of the Sierra Madre Occidental province in an area dominated by outcrops of andesite and dacitic tuffs, overlain by rhyolites and rhyolitic tuffs that were affected by large-scale north-northwest-striking normal faults and intruded by granodiorite and diorite stocks. Incised fluvial canyons cut the uppermost strata and expose the Lower Series volcanic strata.

The mine area is predominantly underlain by a volcanic sequence comprised of andesitic, dacitic and felsic extrusive volcanic strata with interbedded epiclastic strata of similar composition. The mineral occurrences present in the mine area, and the deposit type being sought, are volcanic-hosted high-sulphidation epithermal-hydrothermal gold, silver and porphyry-related gold deposits. Such deposits may be present as veins and/or disseminated deposits and/or breccias. The La India mine deposit area is one of several high-sulphidation epithermal mineralization centres recognized in the region.

Epithermal high-sulphidation mineralization at the La India mine developed as a cluster of gold zones (Main, La India, El Cochi and North zones) aligned north-south, and El Realito aligned north-east, within a spatially related zone of hydrothermal alteration in excess of 20 square kilometres in area. Gold mineralization is confined to the Late Eocene rocks within zones of intermediate and advanced argillitic alteration originally containing sulphides, and subsequently oxidized by supergene processes. The North and Main zones are within two kilometres of each other. The Main Zone and El Realito are within five kilometres of each other.

Mineralization at Chipriona consists of what appears to be structurally controlled gold- and silver-rich veins, stringers and breccias with significant zinc, lead and copper content in sulphides.

The El Realito mineralization is found in northeast-striking subvertical parallel structural corridors of breccia that appear to have acted as conduits, bringing gold and silver mineralization into the favourable subhorizonal volcanic rock layers (the lower porphyritic dacite). El Realito remains open along strike (northeast and southwest) and shows significant potential at depth.

Surface outcrop mapping and drill-hole data so far indicate that the gold system at the Tarachi deposit is likely best classified as a gold porphyry deposit.


Mining Methods

  • Truck & Shovel / Loader


Summary:

The La India mine is a collection of deposits grouped into three open pits – North, La India (Central) and Main – that provide ore for a heap leach pad located just west of the North pit. Operations use traditional open pit mining techniques with bench heights of 6 m and utilize front-end loaders, trucks, track drills and various support equipment. The potential development of satellite deposits provides an opportunity to extend mine life.


Crushing and Grinding


Processing

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

Source: Subscription required

Summary:

La India’s processing flow includes a three-stage crushing process followed by a heap leach operation. 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. The gold adsorption, desorption and refining facility (ADR plant) consists of two parallel trains of six 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 tonnes/day). Ultimate gold recovery is estimated at 69% when leaching is completed.

Recoveries & Grades:

CommodityParameter2021202020192018201720162015
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required66646155
Gold Head Grade, g/t  ......  Subscription required  ......  Subscription required  ......  Subscription required0.720.690.810.95
^ Guidance / Forecast.

Production:

CommodityUnits2021202020192018201720162015
Gold oz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required101,357101,150115,162104,362
Silver koz  ......  Subscription required  ......  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:

Metrics202120202019201820172016
Tonnes milled  ......  Subscription required  ......  Subscription required5,402,415 t6,127,526 t5,965,250 t5,837,404 t
Daily milling rate  ......  Subscription required  ......  Subscription required14,800 t16,789 t16,343 t15,949 t
Daily processing capacity  ......  Subscription required  ......  Subscription required
Annual processing capacity  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.
Subscription required - Subscription is required.

Reserves at December 31, 2020:

CategoryTonnage CommodityGradeContained Metal
Proven & Probable 12,029 kt Gold 0.66 g/t 256 koz
Proven & Probable 12,029 kt Silver 3 g/t 1,159 koz
Measured & Indicated 11,091 kt Gold 0.85 g/t 305 koz
Measured & Indicated 11,091 kt Silver 5.22 g/t 1,860 koz
Inferred 419 kt Gold 0.55 g/t 7 koz
Inferred 419 kt Silver 3.09 g/t 42 koz

Commodity Production Costs:

CommodityUnits2021202020192018201720162015
Credits (by-product) Gold USD  ......  Subscription required  ......  Subscription required -27 / oz -54 / oz -73 / oz -39 / oz
Cash costs Gold USD  ......  Subscription required  ......  Subscription required 682 / oz 604 / oz 432 / oz 475 / oz
Total cash costs Gold USD  ......  Subscription required  ......  Subscription required 712 / oz 634 / oz 468 / oz 475 / oz
Total cash costs Gold USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required† 685 / oz† 580 / oz† 395 / oz† 436 / oz†
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

Units2020201920182017201620152014
Total operating costs ($/t milled) USD 12131211998

Financials:

Units2021202020192018201720162015
Capital expenditures (planned) M USD  ......  Subscription required
Sustaining costs M USD  ......  Subscription required  ......  Subscription required6.7   8.2   10  
Capital expenditures M USD  ......  Subscription required  ......  Subscription required9.2   10.8   10.5   23.4  
Revenue M USD  ......  Subscription required  ......  Subscription required126.5   129.9   142.5   124.7  
Gross profit M USD  ......  Subscription required  ......  Subscription required9.1   21.9   20.7   -6.3  
Subscription required - Subscription is required


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 15, 2021
....................... Subscription required ....................... Subscription required Subscription required Jun 15, 2021
....................... Subscription required ....................... Subscription required Subscription required Jun 15, 2021
....................... Subscription required ....................... Subscription required Subscription required Jun 15, 2021
....................... Subscription required ....................... Subscription required Subscription required Jun 15, 2021
Subscription required - Subscription is required.

Staff:

EmployeesTotal WorkforceYear
Subscription required Subscription required 2020
Subscription required Subscription required 2019
Subscription required Subscription required 2018
Subscription required Subscription required 2017
Subscription required Subscription required 2016
Subscription required Subscription required 2015
Subscription required Subscription required 2014

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Information Form 2018
Annual Report 2018
Sustainability Report 2018
Year-end Mineral Reserves 2018
Annual Information Form 2017
Annual Report 2017
Press Release 2017
Sustainability Report 2017
Annual Report 2016
Form 40-F 2016
Sustainability Report 2016
Annual Report 2015
Form 40-F 2015
Sustainability Report 2015
Form 40-F 2014
Sustainability Report 2014
Technical Report 2012
Subscription required - Subscription is required.

Aerial view:

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