Porcupine River--ancient channel placer Occurrence, Sheenjek District, Yukon-Koyukuk Borough, Alaska, USA
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Location: Location plotted is locality 3 of Barker (1981, p. 47) and 9a of Barker and Clautice (1978, p. 14), in abandoned stream drainage perched about 300 ft (91 m) above river level on south side of Porcupine River, midway between the junctions of Campbell River and Fred Creek, and about 9 mi (14.4 km) downstream from the Yukon border; located to within 1000 ft (305 m).
Geology: Placer deposit in abandoned channel now perched 100-300 ft (30.5-91.5 m) above river level; probably derived from granitic igneous rocks 10-35 mi (16-56 km) upstream in Yukon Territory (Barker and Clautice, 1978, p.19, no.9).
Workings: Panned samples contained 10,000 ppm Zn, 5000 ppm Sn, and minor tungsten (Barker, 1981, p. 117-120).
Commodities (Major) - Sn; (Minor) - B, Pb, Rare earth elements, W, Zn
Development Status: No
Deposit Model: Placer, stream
Mineral List
3 entries listed. 2 valid minerals.
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References
Barker, J.C., 1981, Mineral investigations in the Porcupine River drainage, Alaska: U.S. Bureau of Mines Open-File Report 27-81, 189 p., 2 sheets. Barker, J.C., and Clautice, K.H., 1978, Mineral reconnaissance of the Porcupine River region--A summary report: U.S. Bureau of Mines Open-File Report 87-78, 20 p.