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Mexico
Charcas Mine (IMMSA Operation)

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 Location:
3 km W from Charcas, San Luis Potosí, Mexico

  Regional Office:
Campos Elíseos N° 400 Colonia Lomas de Chapultepec Delegación Miguel Hidalgo
Mexico city
Mexico, Mexico
11000
Phone  ...  Subscription required
Fax(5255) 1103-5567
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Zinc
  • Lead
  • Copper
Mining Method
  • Cut & Fill
  • Room-and-pillar
Processing
  • Flotation
The complex includes three underground mines (San Bartolo, Rey-Reina and La Aurora) and one flotation plant that produces zinc, lead and copper concentrates, with significant amounts of silver.

The Charcas mine is now Mexico’s largest producer of zinc.


Owners

Source: p. 4, 47
CompanyInterestOwnership
Grupo Mexico S.A. de C.V. 88.91 % Indirect
Industrial Minera Mexico, S.A. de C.V. (together with its subsidiaries, the “IMMSA unit”) operates five underground mines that produce zinc, lead, copper, silver and gold, a coal mine and a zinc refinery.

IMMSA’s principal mining facilities include Charcas, Santa Barbara, San Martin, Santa Eulalia and Taxco.

Deposit Type

  • Carbonate replacement


Summary:

The Charcas mining district occupies the east-central part of the Mexican Central Mesa and is part of the Sierra Madre metallogenic province. Geological history starts in the Superior Triasic, where sandy clay sediments were deposited argilloarenaceous. Due to emersion in the beginning of the Jurassic Superior, the sediments suffered intense erosion, settling on continental sediments. This sequence was affected by tectonic effort, which folded and failed on this rock package. Later the positioning of intrusive rocks originated fractures, which gave way to positioning of mineral deposits. The site’s paragenesis suggests two stages of mineralization. First minerals are rich in silver, lead and zinc, with abundant calcite and small quantities of quartz chalcopyrite. Second, there is a link of copper and silver, where the characteristic minerals are chalcopyrite, lead ore with silver content, pyrite and scarce sphalerite. Economic ore is found as replacement sulfurs in carbonates host rock. The ore mineralogy is comprised predominantly of calcopyrite (CuFeS ), sphalerite (ZnS), galena (PbS) and silver minerals as diaphorite (Pb Ag Sb S).


Mining Methods

  • Cut & Fill
  • Room-and-pillar


Summary:

The Charcas mine uses the hydraulic cut-and-fill method and the room-and-pillar mining method with descending benches. The broken ore is hauled to the underground crusher station. The crushed ore is then hoisted to the surface for processing in the flotation plant to produce lead, zinc and copper concentrates.


Crushing and Grinding


Processing

  • Flotation

Source: Subscription required

Summary:

The complex includes three underground mines (San Bartolo, Rey-Reina and La Aurora) and one flotation plant that produces zinc, lead and copper concentrates, with significant amounts of silver.

The capacity of the flotation plant is 4,100 tons of ore per day. The lead concentrate produced at Charcas is treated at a third party refinery in Mexico. The zinc concentrates are treated at our San Luis Potosi zinc refinery and the copper concentrates are treated at our La Caridad smelter.

Recoveries & Grades:

CommodityParameter20132012
Zinc Recovery Rate, %  ......  Subscription required  ......  Subscription required
Zinc Head Grade, % 44.4
Zinc Concentrate Grade, %  ......  Subscription required  ......  Subscription required
Lead Recovery Rate, %  ......  Subscription required  ......  Subscription required
Lead Head Grade, % 0.20.3
Lead Concentrate Grade, %  ......  Subscription required  ......  Subscription required
Copper Recovery Rate, %  ......  Subscription required  ......  Subscription required
Copper Head Grade, % 0.320.27
Copper Concentrate Grade, %  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Production:

CommodityUnits201420132012
Zinc kt 438493
Lead kt  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper kt  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as concentrate.

Operational Metrics:

Metrics201920182017201620152014
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required1,229 kt1,040 kt752.4 kt
Annual milling capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required1,460 kt1,460 kt1,460 kt
Daily milling capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required4,100 t4,100 t4,100 t
Subscription required - Subscription is required.

Combined reserves/resources are reported under IMMSA Operation



Heavy Mobile Equipment as of December 31, 2013:
HME TypeQuantity
Scoop Tram 20
Truck (haul) 13

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 29, 2020
....................... Subscription required ....................... Subscription required Subscription required Jun 29, 2020
....................... Subscription required ....................... Subscription required Subscription required Jun 29, 2020
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2014

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2018
Form 10-K 2017
Annual Report 2016
Form 10-K 2016
Annual Report 2015
Form 10-K 2015
Annual Report 2014
Form 10-K 2014
Form 10-K 2013
Subscription required - Subscription is required.

Aerial view:

Subscription required - Subscription is required.

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