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Joker

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Mo
Ore minerals molybdenite; pyrite
Gangue minerals calcite; quartz

Geographic location

Quadrangle map, 1:250,000-scale BC
Quadrangle map, 1:63,360-scale A-2
Latitude 56.201
Longitude -130.454
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Joker group of 20 claims is at an average elevation of about 1600 feet near the foot of the ridge north of the Leduc River and west of Clara Smith Glacier gorge (Berg and others, 1977, p. 73, 123, and plate 1). The site is about 0.6 of a mile west-southwest of the Alaska-British Columbia boundary. The location is accurate to within about a quarter of a mile.

Geologic setting

Geologic description

The country rocks in the general area of the claims are metavolcanic and metasedimentary strata of the Jurassic or older Mesozoic Hazelton Group, and Eocene quartz monzonite and granodiorite stocks that intrude the Hazelton (Berg and others, 1977, p. 15-26, and plate 1). A field investigation in 1973 by the U.S. Bureau of Mines (Berg and others, p. 42, 123) reported very sparse pyrite and possible molybdenite in quartz-calcite fissure veinlets in Hazelton schist and gneiss that is intruded by aplitic quartz monzonite dikes.
Geologic map unit (-130.455707224849, 56.200676704745)
Mineral deposit model Polymetallic veins (Cox and Singer, 1986; model 22c)?
Mineral deposit model number 22c
Alteration of deposit Intense iron oxide alteration of country rocks within 6 inches of the aplitic dikes.

Production and reserves

Indication of production None

Additional comments

The Joker group of 20 claims were staked in 1952. No claim monuments or evidence of workings were found by the U.S. Bureau of Mines in 1973.
This site is in Misty Fiords National Monument.

References

MRDS Number A010208

References

Berg, H.C., Elliott, R.L., Smith, J.G., Pittman, T.L., and Kimball, A. L., 1977, Mineral resources of the Granite Fiords Wilderness Study Area, Alaska, with a section on aeromagnetic data by Andrew Griscom: U.S. Geological Survey Bulletin 1403, 151 p.
Reporters H. C. Berg (Fullerton, California)
Last report date 5/17/1998