Round Occurrence, McGrath District, Yukon-Koyukuk Borough, Alaska, USA
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Geology: The Round occurrence consists of an iron-stained quartz-epidote stockwork in hornfels of the Late Cretaceous Kuskokwim Group flysch (Bundtzen and Laird, 1983). The occurrence is poorly exposed and mainly observed in talus and rubble crop. No surface dimensions were measured, and its extent is unknown. Selected surface samples contain up to 5.43 grams/tonne silver and 99 ppm copper (Bundtzen and Laird, 1983).
Workings: Selected surface samples contain up to 5.43 g/tonne silver, and 99 ppm copper (Bundtzen and Laird, 1983).
Alteration: None.
Reserves: None.
Commodities (Major) - Ag; (Minor) - Cu
Development Status: No
Deposit Model: Polymetallic vein (Cox and Singer, 1986; model 22c).
Mineral List
2 entries listed. 2 valid minerals.
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References
Bundtzen, T.K., and Laird, G.M., 1983, Geologic map of the McGrath D-6 quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Professional Report 79, 1 sheet, scale 1:63,360.