Unnamed Occurrence (ARDF - MG078; in tributary to the Tatina River), Yukon-Koyukuk Census Area, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - MG078; in tributary to the Tatina River)	- not defined -
Yukon-Koyukuk Census Area	Census Area
Alaska	State
USA	Country

Location: This unnamed occurrence is located in a steep, south-flowing, unnamed tributary of the Tatina River; it is at an elevation of 2,550 feet (777 m) in the SE1/4 sec. 31, T. 27 N., R. 20 W., of the Seward Meridian. The reporter visited the site in 1984; at station no. 84BT120.
Geology: This unnamed occurrence is a mineralized gossan in shale of the Lower Cretaceous Kahiltna Flysch about 500 meters below the contact between the Upper Triassic to Lower Jurassic Tatina River Volcanics and Lower Cretaceous, Kahiltna Flysch (Bundtzen, Harris, and Gilbert, 1997). The gossan strikes east-west across a steep bedrock canyon subparallel to bedding and is about 3 meters thick; the strikelength was not measured. Disseminated chalcopyrite and pyrite were identified in one hand sample, but most mineralization is oxidized. One grab sample of mineralized shale contained 1,200 ppm zinc, 109 ppm copper, 9.3 ppm cadmium, and 7 ppm molybdenum.
Workings: The reporter investigated the site during geologic mapping of the area in 1984 (Bundtzen, Harris, and Gilbert, 1997). One grab sample of mineralized shale contained 1,200 ppm zinc, 109 ppm copper, 9.3 ppm cadmium, and 7 ppm molybdenum.
Alteration: None.
Reserves: None.

Commodities (Major) - Zn; (Minor) - Cd, Cu, Mo
Development Status: No
Deposit Model: Polymetallic replacement (Cox and Singer, 1986; model 19a).

Other Databases

Link to USGS - Alaska:	MG078

Other Regions, Features and Areas containing this locality

References