Unnamed (southwest flank of Rainbow Ridge)

Occurrence, Inactive

Commodities and mineralogy

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

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale B-4
Latitude 63.3162
Longitude -145.673
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of 4,250 feet on the southwest flank of Rainbow Ridge about 1.2 miles west-northwest of the top of Rainbow Mountain. It is in the NE1/4NE1/4 section 32, T. 18 S., R. 11 E., Fairbanks Meridian. This site corresponds to locality 5 in Hanson (1963), locality 20 of Cobb (1979 [OFR 79-238]), and locality S108 in table 2 of Nokelberg and others (1991).

Geologic setting

Geologic description

At this location chalcopyrite and galena occur in quartz veins 6 or more inches thick that strike N5W and dip 70 to 80W (Hanson, 1963). The veins form a subparallel set that cuts tuffaceous sedimentary rocks of the Slana Spur Formation of Pennsylvanian age near a Permian dacite hypabyssal intrusion (Nokleberg and others, 1991). Hanson (1963) collected samples that assayed 3.99 percent copper, 0.02 ounce of gold per ton, and 1.4 ounces of silver per ton.
Geologic map unit (-145.67525166615, 63.3157875986761)
Mineral deposit model Polymetallic veins; Porphyry Cu (Cox and Singer, 1986; model 22c, model 17).
Mineral deposit model number 22c, 17
Age of mineralization Probably Permian.

Production and reserves

Workings or exploration
Hanson (1963) collected samples that assayed 3.99 percent copper, 0.02 ounce of gold, and 1.4 ounces of silver per ton.
The occurrence is on active claims of Northeast Exploration.
Indication of production None