Copper-Stained Banded Siltite at the Blackbird Cobalt-Copper Mine
Copper-Stained Banded Siltite at the Blackbird Cobalt-Copper MineUSGS scientist Art Bookstrom photographs copper-stained banded siltite, exposed in the Blacktail pit of the Blackbird cobalt-copper mine, Salmon River Mountains, east-central Idaho.