Unnamed (Rainbow Ridge south-southeast of Rainbow Mountain)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu; Pb
Other commodities Ag; Au
Ore minerals chalcopyrite; galena; pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale B-4
Latitude 63.2878
Longitude -145.618
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence at an elevation of 6,200 feet is near the crest of Rainbow Ridge 1.5 miles south-southeast of the top of Rainbow Ridge. It is in the NE1/4NW1/4 section 10, T. 19 S., R. 11 E., Fairbanks Meridian. The occurrence is described by Hanson (1963, locality 7). It corresponds to locality 22 in Cobb (1979 [OFR 79-238]) and locality S112 in table 2 of Nokelberg and others (1991).

Geologic setting

Geologic description

This occurrence consists of chalcopyrite, galena, and pyrite in vertical quartz veins as much as 8 feet wide that strike north-south and cut a Permian dacite intrusive (Hanson, 1963; Nokleberg and others, 1991). The dacite intrudes the Tetelna Volcanics of Permian age. A sample of mineralized vein contained 4,000 parts per million (ppm) copper, 6,000 ppm lead, and a trace each of silver and gold (Nokleberg and others, 1991).
Geologic map unit (-145.620246986537, 63.2873878093325)
Mineral deposit model Porphyry Cu (Cox and Singer, 1986; model 17).
Mineral deposit model number 17
Age of mineralization Permian or younger.

Production and reserves

Workings or exploration A sample of mineralized vein contained 4,000 parts per million (ppm) copper, 6,000 ppm lead, and a trace each of silver and gold (Nokleberg and others, 1991).
Indication of production None

References