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Sampling the Moth Bay Zinc-copper Deposit, Revillagigedo Island, Southeastern Alaska.
The Bureau of Mines sampled surface and underground exposures and core drilled for possible extensions of the Moth Bay zinc-copper deposit during the summer field season of 1950. The deposit is less than a mile inland from the head of Moth Bay on Revillagigedo Island. Diamond-drill holes penetrating the mineralized section below the main drift encountered mineralization through a greater width but at considerably lower grade than was found on the drift level and in the surface outcrops. Large samples taken from representative underground exposures of the ore were concentrated by standard selective flotation methods to produce marketable copper and zinc concentrates with reasonably good recoveries.
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division