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Transition Measurement at the Blackbird Cobalt-Copper Mine

Detailed Description

USGS scientist Tom Frost measures the distance across the transition from garnet-bearing rocks, upslope from the end of the tape, to garnet-free rocks below it, as exposed on the northeast wall of the Blacktail pit of the Blackbird cobalt-copper mine, in the Salmon River Mountains of east-central Idaho.


Public Domain.