San Andrés mine, Cerro Llallagua, La Joya district, Cercado Province, Oruro Department, Bolivia
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Altered Tertiary dacite stock intruding Catavi Formation shales. Sulphide veins up to 2 meters thick and 500 meters long cut both the volcanic and sedimentary rocks, and have been worked to 400 m depth. Oxide zone extends to about 100 m depth.
17 entries listed. 16 valid minerals.
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