Overview
| Stage | Production |
| Mine Type | Underground |
| Commodities |
|
| Mining Method |
- Mechanized Cut & Fill
- Hydraulic backfill
|
| Production Start | ...  |
Source:
p. 3, 67
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.
Contractors
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Summary:
The Zn-Pb-Cu (- Ag ± Au) San Martín deposit in northwestern Zacatecas is one of the most economically important and largest skarns in México. Mineral associations in this deposit belong to the sulfide skarn type (with rather "classical" prograde and retrograde zones) and contain peripheral sub-epithermal to epithermal veins.
The San Martín skarn deposit was formed by a hydrothermal system associated with intrusion of the 46-m.y.-old Cerro de la Gloria quartz monzonite stock into the middle Cretaceous Cuesta del Cura limestone. The deposit is exploited by two major mines. The San Martín mine extracts Cu-Zn-Ag ore from veins and replacement bodies hosted by skarn, and the Sabinas mine extracts Zn-Pb-Ag (+ or - Au) ore from veins hosted by skarn and recrystallized limestone.
The vein system represents a series of intrusion-related fractures that roughly parallel the intrusive contact and that served as major conduits for the ore-forming fluids. Formation of both the vein system and sulfide-hosting in skarn probably was aided by volume loss during metasomatism. Other retrograde phases include wollastonite, vesuvianite, epidote, and chlorite; fluorite and calcite are common, and minor quartz is also present.
In the area of San Martín the Cretaceous Cuesta del Cura and Indidura Formations consist of limestones with thin interbeds of flint and shale. It has been observed in the lower levels of the San Martín mine, as well as in deep diamond holes o ........
Mining Methods
- Mechanized Cut & Fill
- Hydraulic backfill
Summary:
Mining is completed using a mechanized Cut and Fill mining method with rockfill and with tailings (hydraulic) and dry tailings. Ramps and levels are developed to provide access to the ore. Attack ramps are then driven to access each cut. The ramps and level development are performed using jumbos. San Martín has been testing the long hole stopping mining methodology after the operation resuming.
Source:
Summary:
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Reserves at December 31, 2021:
The NSR values is “above/below” a cut-off grade the operating unit cost of US$57.59/t.
| Category | Tonnage | Commodity | Grade | Contained Metal |
|
Indicated
|
11,728 kt
|
Zinc
|
2.65 %
|
310.9 kt
|
|
Indicated
|
11,728 kt
|
Copper
|
0.62 %
|
73.2 kt
|
|
Indicated
|
11,728 kt
|
Silver
|
97 g/t
|
36,647 koz
|
|
Indicated
|
11,728 kt
|
Lead
|
0.55 %
|
64.2 kt
|
|
Inferred
|
8,369 kt
|
Zinc
|
2.18 %
|
182.7 kt
|
|
Inferred
|
8,369 kt
|
Copper
|
0.53 %
|
44.3 kt
|
|
Inferred
|
8,369 kt
|
Silver
|
107 g/t
|
28,716 koz
|
|
Inferred
|
8,369 kt
|
Lead
|
0.61 %
|
51.2 kt
|
Financials:
| | Units | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 |
|
Book Value
|
M USD
| ...... | ...... | ...... |
20.4
|
28.2
|
25.2
|
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Heavy Mobile Equipment as of December 31, 2013:
| HME Type | Quantity |
|
Scoop Tram
|
.......................
|
|
Truck (haul)
|
.......................
|
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