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