High-grade 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 8.6 x 3.4 x 2.4 cm (3.4 x 1.3 x 0.9 in) Ralph Noyes Collection Photo Copyright © 2022 Jeffrey M. Schwartz
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