Unnamed (Rainbow Mountain)

Occurrences, Active

Commodities and mineralogy

Main commodities Ag; Cu
Other commodities Au; Pb; Zn
Ore minerals chalcocite; malachite; pyrite
Gangue minerals calcite; quartz

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale B-4
Latitude 63.3089
Longitude -145.6263
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of 6,550 feet, about 0.2 mile southeast of the top of Rainbow Mountain. It is in the SW1/4SW1/4 section 34, T. 18 S., R. 11 E., Fairbanks Meridian. This record combines two occurrences, one discovered by American Copper and Nickel Company (W.T. Ellis, oral communication, 1996) and a nearby occurrence that corresponds to locality S109 in table of Nokelberg and others (1991).

Geologic setting

Geologic description

The rocks at the top of Rainbow Mountain are Slana Spur Formation of Pennsylvanian age and fragmental andesite and dacite volcanic rocks that are intruded by Permian metadacite porphyry (Nokleberg and others, 1991). A quartz-calcite-chalcocite-veined copper-stained zone at this locality was sampled by American Copper and Nickel Company (W.T. Ellis, oral communication, 1998). Their samples contained 8.7 percent copper, 33 parts per million (ppm) silver, and 76 parts per billion gold. The U.S. Geological Survey collected a composite chip sample of nearby iron-stained, pyritic metadacite porphyry that contained 700 ppm zinc and 300 ppm lead (Nokleberg and others, 1991).
Geologic map unit (-145.628549411757, 63.3084883637632)
Mineral deposit model Polymetallic veins (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Age of mineralization Probably Permian.

Production and reserves

Workings or exploration
American Copper and Nickel Company (W.T. Ellis, oral communication, 1998) samples contained 8.7 percent copper, 33 parts per million (ppm) silver, and 76 parts per billion gold. The U.S. Geological Survey collected a composite chip sample of nearby iron-stained, pyritic metadacite porphyry that contained 700 ppm zinc and 300 ppm lead (Nokleberg and others, 1991).
The occurrences are on active claims of MAN Resources.
Indication of production None

References