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Mexico
Santa Eulalia Mine (IMMSA Operation)

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 Location:
24 km E from Chihuahua, Chihuahua, Mexico

  Address:
Santa Eulalia PO Box 721
Aquiles Serdan
Chihuahua, Mexico
31650
Phone  ...  Subscription required
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Processing
  • Production
  • Reserves
  • Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StatusTemporary Suspension
Mine TypeUnderground
Commodities
  • Zinc
  • Lead
Mining Method
  • Cut & Fill
Processing
  • Crush & Screen plant
  • Flotation
In the first quarter of 2020, the Santa Eulalia mine temporarily suspended its operations due to flooding. Management are currently evaluating different options to supply the Santa Eulalia concentrator.


Owners

Source: p. 3, 67
CompanyInterestOwnership
Grupo Mexico S.A. de C.V. 88.87 % Indirect
Ownership Tree
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


Summary:

The geologic setting of the Santa Eulalia district is similar to other high-temperature, carbonate-hosted Ag-Pb-Zn deposits of northern Mexico. The host rocks are Cretaceous limestones intruded by felsite and diabase dikes and sills.

Mineralization is associated in time and space with the felsite intrusions in two zones known as the East and West camps, which lie on opposite flanks of a broad, doubly plunging anticline. The felsites are texturally and compositionally indistinguishable and have identical REE patterns. West camp mineralization consists of massive sulfide mantos and chimneys with lesser mineralized breccias and skarn bodies. East camp mineralization consists of dike contact skarns with subordinate massive sulfide bodies. Structural controls on mineralization in both camps include reactivated fold-related fracturing and faulting as well as intrusive contacts. Host-rock lithology (specially secondarily enhanced permeability) controls ore distribution in the upper and peripheral parts of the district. Ten different ore types have been recognized in the district, but only the normal sulfides, silicates (calcic-iron skarns), and calc-silicate skarn ores were examined in this study. The ore mineralogy throughout the district is relatively simple, consisting of pyrrhotite, pyrite, sphalerite, and galena with minor amounts of calcite, quartz, fluorite, and in places calc-silicate gangue. Despite stark differences in trace metal contents and the amount and composition of the skarns in the two camps, the overall geologic character, fluid inclusion compositions, sulfur, oxygen and carbon isotope characteristics and alteration assemblages are similar enough to indicate that the ore fluids for both camps had a common origin.

West camp mineralization
Manto and chimney deposits are the most common types of mineralization in the West camp. The ore mineralogy consists of pyrrhotite, galena, sphalerite, and pyrite, replacing limestone with little alteration of the host rock. Skarn mineralization is more limited, present as either silicate or calc-silicate orebodies. Silicate orebodies consist of Ca-Fe silicates with Mn-rich compositions. The silicate orebodies are reported to have higher silver values than the manto ores. Ca-silicate orebodies consist of calcic skarn silicate minerals and an ore assemblage of galena, sphalerite, arsenopyrite, pyrite, and pyrrhotite. Trace amounts of chalcopyrite and pyrrhotite,
argentopyrite, polybasite, and stephanite are also reported as discrete minerals in the calc-silicate ores.

East camp mineralization
Mineralization in the East camp is controlled by structures related to the San Antonio graben and the contacts of a series of felsite dikes that follow and cut across the graben faults. Skarn mineralization dominates and calc-silicate mineralogy is bilaterally and symmetrically zoned outward from the dikes. The dikes are widely converted to calc- silicates. Most of the sulfides in the East camp occur within the skarn, but podiform sphalerite + pyrite ± pyrrhotite bodies (± galena) commonly occur between the skarns
and the enclosing limestone. Massive sulfide mantos composed of galena, sphalerite, and pyrrhotite, are texturally similar to the West camp ores and occur in contact with, and peripheral to, the skarns.


Mining Methods

  • Cut & Fill


Summary:


Crushing and Grinding


Processing

  • Crush & Screen plant
  • Flotation

Source: Subscription required

Summary:

The flotation plant, at which lead and zinc concentrates are produced, has a capacity of 1,450 tons of ore per day. The lead concentrate is treated at a third party refinery, and the zinc concentrate is treated at our San Luis Potosi refinery.

CommodityParameter
Zinc Recovery Rate, %
Zinc Head Grade, %
Zinc Concentrate Grade, %
Lead Recovery Rate, %
Lead Head Grade, %
Lead Concentrate Grade, %

Production:

CommodityProductUnits202020192018201720162014
Zinc Metal in concentrate kt  ......  Subscription required  ......  Subscription required161416
Zinc Concentrate kt 18
Lead Concentrate kt  ......  Subscription required
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019201820172016
Annual milling capacity  ......  Subscription required  ......  Subscription required547.5 kt547.5 kt547.5 kt547.5 kt
Tonnes milled  ......  Subscription required  ......  Subscription required327.1 kt316 kt283.9 kt278.2 kt
Daily milling capacity  ......  Subscription required  ......  Subscription required1,450 t
Subscription required - Subscription is required.

Combined reserves/resources are reported under IMMSA Operation


Financials:

Units202120202019201820172016
Book Value M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required37.3   30.2   32.1  
Subscription required - Subscription is required


Heavy Mobile Equipment as of December 31, 2013:
HME TypeQuantity
Scoop Tram ....................... Subscription required
Truck (haul) ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 6, 2022
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2014

Corporate Filings & Presentations:

DocumentYear
Other 2022
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2019
Form 10-K 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
Other 2009
Other 2000
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