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Mexico
San Martin Mine (IMMSA Operation)

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 Location:
11 km NW from Sombrerete, Zacatecas, 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
  • Copper
  • Silver
Mining Method
  • Cut & Fill
Processing
  • Flotation
The workers of the San Martin mine were on strike from July 2007 to August 2018. The Company restored production from the San Martin mine in the second quarter of 2019.


Owners

Source: p. 3, 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

  • Skarn
  • Vein / narrow vein


Summary:

San Martin lies in the Central Mesa between two major geologic provinces, Sierra Madre Occidental and Sierra Madre Oriental. The main sedimentary rock-formation in the San Martin district is the Upper Cretaceous Age Cuesta del Cura limestone. The formation is an interlayered sequence of shallow marine limestone and black chert, and it is overlain by Indura formation which outcrops at the foot of the topographic heights of the Cuesta del Cura formation. It consists mainly of alternating shales and fine-grained clayed limestones in ten to thirty centimeter thick layers.

The district’s most important mineral deposits are replacement veins and bodies generated in the skarn by Cerro de la Gloria granodiorite intrusion. An extensive zone of skarn west of the intrusive hosts, the San Marcial, Ibarra and Gallo-Gallina main ore veins, which appear at the surface for distances of up to 1,000 meters, with thicknesses of 40 centimeters to four meters, paralleling the intrusive contact. In the central part of the deposit there is a horizontal zoning with respect to the contact of the intrusive with high values of silver and copper. In the top of the deposit there is mostly lead and zinc. In the northeast/east over concentric structures to the intrusive there is an increment of lead, zinc and silver in the skarn. Economic ore is found as replacement ore bodies between the main veins as massive and disseminated sulfides with widths from eight meters up to 200 meters. These bodies consist mostly of chalcopyrite (CuFeS), sphalerite (ZnS), galena (PbS), bornite (Cu FeS ), tetrahedrite (CuFe Sb S ), native silver (Ag), pyrrite (FeS), arsenopyrite (FeAsS) and stibnite (Sb S ). Molybdenum and tungsten are found in little portions in the skarn near the contact associated with the calcite.


Mining Methods

  • Cut & Fill


Summary:

The horizontal cut-and-fill mining method is used at the San Martin mine.


Crushing and Grinding


Processing

  • Flotation

Source: Subscription required

Summary:

The broken ore is hauled to the underground crusher station. The ore is then brought to the surface and fed to the flotation plant to produce concentrates. The flotation plant has a total capacity of 4,400 tons of ore per day. The lead concentrate is treated at a third party refinery in Mexico. Copper concentrate is treated at the La Caridad smelter and zinc concentrate is treated at the San Luis Potosi zinc refinery or zinc concentrate is sold to third parties.


Production:

CommodityUnits2019
Zinc t  ......  Subscription required
Copper t  ......  Subscription required
Silver M oz  ......  Subscription required
All production numbers are expressed as metal in concentrate.
Subscription required - Subscription is required.

Operational Metrics:

Metrics20192018201720162015
Tonnes milled  ......  Subscription required
Annual milling capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required1,606 kt1,606 kt
Daily milling capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required4,400 t4,400 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 13
Truck (haul) 9

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 2013

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
Form 10-K 2017
Annual Report 2016
Form 10-K 2016
Annual Report 2015
Form 10-K 2015
Form 10-K 2013
Subscription required - Subscription is required.

Aerial view:

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