Cobre

Prospect, Inactive

Commodities and mineralogy

Main commodities Cu; Pb; Zn
Other commodities Ag; Co
Ore minerals chalcopyrite

Geographic location

Quadrangle map, 1:250,000-scale AR
Quadrangle map, 1:63,360-scale B-3
Latitude 67.38
Longitude -157.2
Nearby scientific data Find additional scientific data near this location
Location and accuracy 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).

Geologic setting

Geologic description

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.
Geologic map unit (-157.202795668211, 67.3794636907495)
Mineral deposit model Kuroko (Cox and Singer, 1986; model 28a)?
Mineral deposit model number 28a?
Age of mineralization Early Paleozoic?

Production and reserves

Workings or exploration Geologic mapping and some geochemical sampling. Claims staked in 1979 by Anaconda. One six foot (2 m) chip sample ran 0.34 percent Cu, 10 ppm Pb, 9 ppm Zn, 9 ppm Co. Two float samples ran 0.7 percent and 0.8 percent 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ppm Pb, 18 and 14 ppm Zn, and 3 and 2 ppm Co. A sample from a vein in marble ran 4700 ppm Pb, 760 ppm Zn, 4.9 ppm Ag (unpublished Anaconda notes).
Indication of production None

Additional comments

Discovered by Anaconda geologist in 1979.

References

MRDS Number A106046
Reporters S.W. Nelson (USGS retired)
Last report date 5/12/1997