Pushbush

Prospect, Undetermined

Commodities and mineralogy

Main commodities Cu; Mo
Ore minerals chalcopyrite; molybdenite; pyrite

Geographic location

Quadrangle map, 1:250,000-scale TC
Quadrangle map, 1:63,360-scale C-1
Latitude 63.52
Longitude -141.32
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Pushbush prospect is located in the SE 1/4 section 11, T. 20 N., R. 21 E., of the Copper River Meridian. It is location 11 of Singer and others (1976), and location 13 of Eberlein and others (1977). It is just north of the Big Creek prospect (TC004). The location is accurate to within 1 mile.

Geologic setting

Geologic description

The Pushbush prospect consists of disseminated pyrite, chalcopyrite, and molybdenite in Tertiary mafic and felsic volcanic rocks, biotite gneiss, and schist. The schist is likely Paleozoic and/or Precambrian in age, and has undergone amphibolite facies metamorphism (Foster and Keith, 1994). The extent of mineralization is unknown. The deposit has been trenched, but two diamond drill holes in the 1970s did not encounter mineralization (Eberlein and others, 1977, p. 102). Secondary biotite gave a K-Ar age of 56 +/- 2 Ma (Sinclair, 1986).
Geologic map unit (-141.322227314396, 63.5196819111589)
Mineral deposit model Porphyry Cu-Mo deposit (Cox and Singer, 1986; model 21a)
Mineral deposit model number 21a
Age of mineralization Secondary biotite gave a K-Ar age of 56 +/- 2 Ma (Sinclair, 1986).

Production and reserves

Workings or exploration Explored by trenches, and two drill holes.
Indication of production None

Additional comments

See also: Taurus (TC027) and ASARCO (TC001) prospects.

References

MRDS Number A012536

References

Foster, H.L., and Keith, T.E.C., 1994, Geology of the Yukon-Tanana area of east-central Alaska: in Plafker, G. and Berg, H.C., eds, The geology of North America, vol. G-1, The geology of Alaska: Geological Society of America, p. 205-240.
Sinclair, W.D., 1986, Molybdenum, tungsten, and tin deposits and associated granitoid intrusions in the northern Canadian cordillera and adjacent parts of Alaska, in Morin, J.A., ed., Mineral deposits of the northern cordillera: Canadian Institute of Mining and Metallurgy, Special Volume 37, p. 216-233.
Reporters C.E. Cameron (ADGGS)
Last report date 4/13/1999