Unnamed Occurrence (ARDF - CI061), Circle District, Yukon-Koyukuk Borough, Alaska, USA
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Geology: This occurrence is an unconfirmed report of a wolframite-bearing vein in a prospect hole sunk when the high bench gravels were being prospected for gold. Wolframite has been found in placers below the mouth of Discovery Gulch (Johnson, 1910, p. 248). This wolframite-bearing vein is within the Lower Schist bedrock unit described by Wiltse and others (1995) as a medium to dark gray and medium greenish-gray, fine- to medium-grained, commonly slightly calcareous quartz-muscovite schist, with lesser amounts of quartzose porphyroblastic albite-chlorite schist and chlorite schist.
Workings: A prospect hole was dug around 1908 in a placer deposit that uncovered the wolframite vein, but was caved in by 1909 (Johnson, 1910).
Commodities (Major) - W
Development Status: None
1 entry listed.
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Brooks, A.H., 1910, Mineral resources of Alaska, report on progress of investigations in 1909: U.S. Geological Survey Bulletin 442, 426 p. Johnson, B.L., 1910, Occurrence of wolframite and cassiterite in the gold placers of Deadwood Creek, Birch Creek district: U.S. Geological Survey Bulletin 442-F, p. 246-250. Menzie, W.D., Foster, H.L., Tripp, R.B., and Yeend, W.E., 1983, Mineral resource assessment of the Circle quadrangle, Alaska: U.S. Geological Survey Open-File Report 83-170-B, 61 p., 1 sheet, 1:250,000.