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Cosalá Operations

 Nuestra Señora
 Located in the Cosalá district, Nuestra Señora is a fully mechanized underground silver-zinc-lead-copper mine with the benefit of flexible mining methods and diversified metal production.

With a processing facility nearby, the operation has a capacity of 1,600 tonnes per day and permitted capacity for expansion to 4,000 tonnes per day. The plant produces zinc, copper and lead concentrates, with a significant silver component in the copper and lead concentrates. Concentrates are delivered to purchasers in Manzanillo, Mexico.


Mineralization at the Nuestra Señora mine occurs in four known deposits located within a 500m by 250m area - Nuestra Señora, Candelaria, Santa Teresa and Santo Domingo - which were originally developed and exploited from 1954 to 1965 by Asarco. Carbonate replacement-style mantos, veins, chimneys, chimney breccias, and mineralized exoskarn and endoskarn occur within limestone and granodiorite. Pyrite, sphalerite, chalcopyrite, galena, and lesser tetrahedrite are the dominant sulfide minerals.

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