A Copper-cobalt Occurrence in the Cape Krusenstern Area, Northwestern Alaska.
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An occurrence of copper mineralization with minor cobalt and traces of gold and silver was found in the Cape Krusenstern National Monument, Alaska, during critical and strategic mineral investigations by the Bureau of Mines. The occurrence consists of subangular sulfide-quartz boulders found in the drainage of Rabbit Creek and one similarly mineralized, poorly exposed vein outcropping. The mineralized boulders are up to at least 3 ft wide. Chip and grab samples generally contained 0.5 to 6.7 pct copper with associated cobalt ranging from trace to 0.153 pct. The mineralization is suggestive of silicified shear zones in green to gray phyllites believed to be part of the late Devonian to early Mississippian endicott groups. Further trenching and soil sampling necessary to assess this occurrence are not possible within the monument. This occurrence and reports of other mineralization in the area suggest a general favorability for mineralization in the Cape Krusenstern area.
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