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San Francisco mine, Poopó town, Poopó Province, Oruro Department, Bolivia

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Brecciated zinc-tin-silver veins occupying fissures in normal faults. This mine, still in production, is located on part of the same 10km-long vein system as the better-known Santa Cruz mine (type locality of cylindrite). Mined for silver in Spanish colonial times, although no discrete silver minerals are known from here; Silver is however present in several sulphosalts, eg: up to 1% in franckeite, 0.5% in cylindrite, 0.45% in jamesonite, with ore sampling in the 1930s showing 1.38% Sn, 0.18% Ag (Ahlfeld and Schneider-Scherbina (1964) Los Yacimientos Minerales y de Hidrocarburos de Bolivia, Ministerio de Minas y Petroleo, La Paz).

Mineral List

Cylindrite
Fluorapatite
Franckeite

Jamesonite
Kermesite
Metastibnite

Pyrargyrite
Pyrite
Quartz

Sphalerite
Zinkenite

11 entries listed. 11 valid minerals.

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