(Au, Ag) |
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Banded gold and silver ore specimen with visible ELECTRUM and possible NAUMANNITE Knob Hill Mine (Golden Promise Mine) |
High-grade ore specimen with visible ELECTRUM and possible NAUMANNITE Knob Hill Mine (Golden Promise Mine) |
Rich ELECTRUM grains within dark gray bands of NAUMANNITE and white QUARTZ (Var: Chalcedony) Knob Hill Mine (Golden Promise Mine) |
ELECTRUM grains within dark gray bands of NAUMANNITE and white QUARTZ (Var: Chalcedony) Knob Hill Mine (Golden Promise Mine) |