The paper considers fahlores chemistry in deposits of the Birgilda-Tomino ore cluster (East Uralian volcanic zone, South Urals). The latter includes several porphyry and porphyry-related deposits. Fahlores from the least eroded epithermal Au-Ag deposits are featured by elevated As, Cu, Fe, Te, and Bi contents. Fahlores from base-metal deposits located on margins of porphyry-related systems have high Sb and Ag contents. This proves fahlore as a key mineral in a telescoped porphyry-related system.
Fahlores, epithermal, porphyry, zoning, Urals
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