Porcupine River--ancient channel placer

Occurrence, Inactive

Commodities and mineralogy

Main commodities Sn
Other commodities B; Pb; REE; W; Zn
Ore minerals cassiterite; scheelite; tourmaline

Geographic location

Quadrangle map, 1:250,000-scale CO
Latitude 67.333
Longitude -141.275
Nearby scientific data Find additional scientific data near this location
Location and accuracy 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).

Geologic setting

Geologic description

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 miles (16-56 km) upstream in Yukon Territory (Barker and Clautice, 1978, p. 19, no. 9).
Geologic map unit (-141.277692917181, 67.3327500152377)
Mineral deposit model Placer, stream (Singer and Cox, 1986; model 39a).
Mineral deposit model number 39a

Production and reserves

Workings or exploration Panned samples contained 10,000 ppm Zn, 5000 ppm Sn, and minor tungsten (Barker, 1981, p. 117-120).
Indication of production None

Additional comments

See MAS/MILS Sequence number 0020330010 (USBM, 1995).

References