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Mexico
IMMSA Operation (Charcas Mine, Nueva Rosita Mine, San Martin Mine, Santa Barbara Mine, Santa Eulalia Mine, Taxco Mine)

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 Location:
11 km NW from Sombrerete, 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
  • Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit / Underground
Commodities
  • Zinc
  • Lead
  • Copper
  • Silver
Mining Method
  • Truck & Shovel / Loader
  • Cut & Fill
  • Shrinkage stoping
  • Longhole stoping
  • Bench stoping
  • Room-and-pillar
Processing
  • Calcining
  • Flotation
  • Heap leach
  • Acid tank leaching
  • Solvent Extraction & Electrowinning
  • Roasting
IMMSA unit (underground mining poly-metallic division) operates five underground mining complexes situated in central and northern Mexico and produces zinc, lead, copper, silver and gold, and has a coal mine.


Owners

Source: p. 4
CompanyInterestOwnership
Grupo Mexico S.A. de C.V. 88.91 % Indirect
In April 2005, we acquired Minera Mexico, from Americas Mining Corporation (“AMC”), a subsidiary of Grupo Mexico, our controlling stockholder. Minera Mexico is a holding company and all of its operations are conducted through subsidiaries that are grouped into three units: the La Caridad unit, the Buenavista unit, the IMMSA unit. Southern Copper Corp owns 99.96% of Minera Mexico.

Deposit Type

  • Skarn
  • Breccia pipe / Stockwork
  • Vein / narrow vein
  • Manto
  • 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. 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).

San Martin lies in the Central Mesa between two major geologic provinces, Sierra Madre Occidental and Sierra Madre Oriental. The district’s most important mineral deposits are replacement veins and bodies generated in the skarn by Cerro de la Gloria granodiorite intrusion.

The majority of production from Santa Barbara district comes from quartz veins within faults and fractures. The north to northwestern trending veins is up to several kilometers long, dips steeply to the west and is 0.5 to 30 meters wide.

Santa Eulalia mineralization corresponds in its majority to ore skarns — silicoaluminates of calcium, iron and manganese with variable quantities of lead, zinc, copper and iron sulfides, located in the planes of crossings in the interstices of the silicates. Economic ore is found as replacement in the Limestone Glen Rose in the contact with dikes and sills and replacements in diabase sills. The mineralogy is comprised predominantly of sphalerite (ZnS), galena (PbS) and small quantities of pyrargyrite (Ag SbS ).

There are four types of ore deposits found in Taxco district. In order of importance they are as follows: fissure-filling veins, replacement veins, blanket-like replacement bodies (so called “mantos”), stock works and brecciate chimneys. Economic ore is found in the deposit in veins. Ore mineral include argentiferous galena (PbS), sphalerite (ZnS), pyrargyrite (Ag3SbS3), and other sulfosalts, and replacement “mantos.” The most mineralized zones are in the vicinity of the veins with the limestone.


Mining Methods

  • Truck & Shovel / Loader
  • Cut & Fill
  • Shrinkage stoping
  • Longhole stoping
  • Bench stoping
  • Room-and-pillar


Summary:

IMMSA unit (underground mining poly-metallic division) operates five underground mining complexes situated in central and northern Mexico and produces zinc, lead, copper, silver and gold, and has a coal mine. These complexes include industrial processing facilities for zinc, lead, copper and silver. All of IMMSA’s mining facilities employ exploitation systems and conventional equipment. IMMSA’s principal mining facilities include Charcas, Santa Barbara, San Martin, Santa Eulalia and Taxco.

The Charcas mine uses the hydraulic cut-and-fill method and the room-and-pillar mining method with descending benches. [Form 10-K 2013. P.56]

The horizontal cut-and-fill mining method is used at the San Martin mine.
[Form 10-K 2013. P.59].

The mining operations at Santa Barbara are more diverse and complex than any of the other mines in our Mexican operations, with veins that aggregate approximately 21 kilometers in length. Due to the variable characteristics of the ore bodies, four types of mining methods are used: shrinkage stoping, long-hole drilled open stoping, cut-and-fill stoping and horizontal bench stoping.


The Taxco mining complex includes several underground mines (San Antonio, Guerrero and Remedios) and employ shrinkage, cut-and-fill and the room and pillar mining methods at the mines.
[Form 10-K 2013. P.60]

The Nueva Rosita coal and coke complex began operations in 1924 and is located in the state of Coahuila, Mexico on the outskirts of the city of Nueva Rosita near the Texas border. It includes a) an underground coal mine, which has been closed as a result of an accident in 2006; b) an open-pit mine with a yearly capacity of approximately 350,000 tons of coal; c) a coal washing plant completed in 1998 with a capacity of 900,000 tons per year that produces clean coal of a higher quality; and d) a re-engineered and modernized 21 oven coke facility capable of producing 100,000 tons of coke per year (metallurgical, nut and fine) of which, 95,000 tons are metallurgical coke.
[Form 10-K 2013. P.62].

On February 19, 2020, the Company announced the decision to return the underground coal mine, (the Olivo concession), which had been closed since 2006.


Crushing and Grinding


Processing

  • Calcining
  • Flotation
  • Heap leach
  • Acid tank leaching
  • Solvent Extraction & Electrowinning
  • Roasting

Source: Subscription required

Summary:

The San Luis Potosi electrolytic zinc refinery was built in 1982 and was designed to produce 105,000 tons of refined zinc per year by treating up to 200,000 tons of zinc concentrate from our own mines, principally Charcas, which is located 113 kilometers from the refinery. The refinery produces special high grade zinc (99.995%), high grade zinc (over 99.9%) and zincbased alloys with aluminum, lead, copper or magnesium in varying quantities and sizes depending on market demand. Refined silver and gold production is obtained from tolling services provided by a third party mining company.

The electrolytic zinc refinery has an acid plant, a steam recovery boiler and a roaster. There is also a calcine processing area with five leaching stages: neutral, hot acid, intermediate acid, acid, purified fourth and jarosite, as well as two stages for solution purifying.

Recoveries & Grades:

CommodityParameter2019201820172016201520142013
Zinc Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Zinc Head Grade, % 2.242.512.762.812.6833.58
Zinc Concentrate Grade, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Lead Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Lead Head Grade, % 0.780.910.9510.961.060.96
Lead Concentrate Grade, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper Head Grade, % 0.380.350.350.370.380.390.39
Copper Concentrate Grade, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Head Grade, oz/t 2.262.252.192.352.312.712.79
Silver Concentrate Grade, oz/t  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Production:

CommodityProductUnits201920182017201620152014
Zinc Metal in concentrate kt  ......  Subscription required  ......  Subscription required69746267
Zinc Concentrate kt  ......  Subscription required  ......  Subscription required129140115124
Lead Metal in concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Lead Concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper Metal in concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper Concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Metal in concentrate koz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Operational Metrics:

Metrics201920182017201620152014
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required3,031 kt2,631 kt2,471 kt
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required3,031 kt2,631 kt2,471 kt
Subscription required - Subscription is required.

Reserves at December 31, 2019:

CategoryTonnage CommodityGradeContained Metal
Proven 17,217 kt Zinc 2.65 % 456.3 kt
Proven 17,217 kt Lead 1.25 % 215.2 kt
Proven 17,217 kt Copper 0.47 % 81 kt
Probable 28,379 kt Zinc 2.77 % 786.2 kt
Probable 28,379 kt Lead 0.96 % 272.4 kt
Probable 28,379 kt Copper 0.59 % 167 kt
Proven & Probable 45,596 kt Zinc 2.73 % 1,243 kt
Proven & Probable 45,596 kt Lead 1.07 % 487.6 kt
Proven & Probable 45,596 kt Copper 0.545 % 248 kt

Financials:

Units2019201820172016201520142013
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 39.2   45.7   60.6  
Operating Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 13.7   27.5   65.1  
Subscription required - Subscription is required


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 30, 2020
....................... Subscription required ....................... Subscription required Subscription required Jun 30, 2020
....................... Subscription required ....................... Subscription required Subscription required Jun 30, 2020
....................... Subscription required ....................... Subscription required Subscription required Jun 30, 2020
Subscription required - Subscription is required.


Corporate Filings & Presentations:

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

Subscription required - Subscription is required.

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