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Tungsten Investigations Near Vabm Bend, Eastern Alaska.
For Reference Only At Bureau Libraries :24 pages
Numerous scheelite occurrences in the Charley River area of east- central Alaska suggest the existence of a broad geographic zone with a potential for economic deposits of tungsten. The trend strikes northwesterly across a region of diverse geology from the Seventymile District to Pinnell Mountain. Tungsten mineralization occurs on a tributary of Crescent Creek in the Charley River drainage as disseminated grains and aggregates up to 2 cm across in banded, hornfelsic calc-silicates; disseminated grains in biotite- quartz monzonite; and concentrations in siliceous veins less than 1 cm across in leucocratic, igneous rocks. Weathering of these rocks has led to concentration of scheelite in placer deposits.
For Reference Only At Bureau Libraries
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division