Silver was first discovered in the district prior to the 1630's, but mining was difficult due to carbon dioxide issuing from the rock. The area was exploited by the Spaniards in the 17th and 18th centuries. There was intermittent activity from around 1860 through 1936. Mining began again in 1963. A modern open pit operation will eventually consume most of the ancient sublocalities here.
The geology of the district is complex resulting from the variety of rock types that are present, many of which are results of hydrothermal alteration. The district contains rocks of the sedimentary Potoco and Quehua Formations and also an area of Quaternary Dacite tuff. There are several igneous rock groups present. An andesite Porphyry is located in the Quehua Formation, a Dacite porphyry also contacting the Quehua Formation and an intrusive breccia.
Ref: Geology and Mineral Deposits of the San Cristóbal District, Villa Martin Province, Potosi Bolivia; H. S. Jacobson et al; 1969
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