Cobre Prospect, Kiana Mining District, Northwest Arctic Borough, Alaska, USAi

Regional Level Types
Cobre Prospect	Prospect
Kiana Mining District	Mining District
Northwest Arctic Borough	Borough
Alaska	State
USA	Country

Discovered by Anaconda geologist in 1979.
Location: Located on ridge west of Kalurivik Creek near Peak 3430 in sec. 24, T. 23 N., R. 8 E., Kateel River Meridian. Location is accurate to within 1000 ft. (300 m).
Geology: Bedding-controlled disseminated chalcopyrite deposit up to 6 ft (3 m) thick in metaquartzite, quartz-mica schist, quartz-chlorite schist. and locally marble. The copper-bearing beds are estimated to lie 4000 m stratigraphically below the Smucker rhyolite (Devonian). The host rocks could therefore be early Paleozoic or late PreCambrian. The copper-bearing rocks are interlayered with marbles and lie about 60 m stratigraphically above a stromatolite-bearing horizon. Other stromatolites are found along the ridge 7800 ft (2600 m) to the north, in a faulted syncline.
Workings: Geologic mapping and some geochemical sampling. Claims staked in 1979 by Anaconda. One six foot (2 m) chip sample ran 0.34% Cu, 10 ppm Pb, 9 ppm Zn, 9 ppm Co. Two float samples ran 0.7% and 0.8 % Cu, 40 and 29 ppm Pb, 18 and 14 ppm Zn, and 3 and 2 ppm Co. A sample from a vein in marble ran 4700 ppm Pb, 760 ppm Zn, 4.9 ppm Ag (unpublished Anaconda notes).
Age: Early Paleozoic ?

Commodities (Major) - Cu, Pb, Zn; (Minor) - Ag, Co
Development Status: No
Deposit Model: Kuroko ?

Other Databases

Link to USGS - Alaska:	AR035

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