Banded gold and silver ore specimen with visible ELECTRUM and possible NAUMANNITE Knob Hill Mine (Golden Promise Mine), Klondike Mountain, Republic, Republic District, Ferry County, Washington, USA Specimen is 10.0 x 7.5 x 1.1 cm (3.9 x 3.0 x 0.4 in) Ralph Noyes Collection Photo Copyright © 2023 Jeffrey M. Schwartz
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