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Reconnaissance Sampling of the Avnet Manganese Prospect, Tanana Quadrangle, Central Alaska.
The avnet manganese prospect on the Yukon-Tanana divide about 20 airline miles s 80 deg e of the proposed rampart dam was reexamined by the Bureau of Mines because of potential changes in commercial aspects due to possible low-coat power from rampart and current improvements in the arterial highway system of central Alaska. Reconnaissance sampling of manganiferous material scattered surficially over an area 3,000 feet long and 600 feet wide, along the crest of a flat-topped ridge, indicates possible psilomelane in- place containing 15 to 20 percent manganese. The areal extent of surface mineralization with an accumulation of psilomelane is numerous frost boils and frost mounds and in talus shows possible large in-place tonnages of manganese. Preliminary investigation with bulldozer trenches is recommended to sample bedrock sources and determine the geologic character of the in-place deposit. Any further investigations should be determined from bedrock sampling results and geology.
Page last reviewed: March 11, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division