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Structure of the ore deposits at Santa Barbara, Chihuahua, Mexico
AuthorScott, James B
Geological Sciences and Engineering
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The Santa Barbara mines are grouped in a circle around the village of Santa Barbara located in the Parral mining district, in southern Chihuahua, Mexico. The mines are operated by American Smelting and Refining Company and the bulk of the mineral production comes from eleven vein systems. The pre-mineral rock types consist of a thick calcareous shale formation and andesite flows. The post-mineral rock types consist of dikes and sills of rhyolite and diabase, a thin conglomerate formation, basalt flows, and unconsolidated stream sediments. Pre-mineral faulting took place in two stages, forming four fault systems. Any fault within one system is similar in both strike and dip to another fault within that system. Movement along these faults, vertical in the first-stage faults and horizontal in the second-stage faults, formed openings, breccia zones, and in places horses and wedges of country rock in the faults. The location and explanation of these openings, breccia zones, horses and wedges are the main topic in this paper.
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