Unnamed (Rainbow Ridge south of Rainbow Mountain)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu; Pb
Other commodities Ag; Au
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 63.2891
Longitude -145.6306
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of 5,000 feet 1.4 miles south of the top of Rainbow Mountain. It is in the northeast corner of section 10, T. 19 S., R. 11 E., Fairbanks Meridian. The occurrence is described by Hanson (1963, plate 5, locality 6) and corresponds to locality 21 in Cobb (1979 [OFR 79-238]) and locality S111 in table 2 of Nokelberg and others (1991).

Geologic setting

Geologic description

At this location a swarm of ten subparallel quartz veins (Hanson, 1963) that range from 0.2 to 1.0 inch thick strikes N30W and dips 55E. The veins contain scattered chalcopyrite and galena and traces of gold and silver. They cut dacite lapilli tuff of the Slana Spur Formation of Pennsylvanian age (Nokleberg and others, 1991). Samples of veins assay as much as 0.8 percent copper, 0.3 percent lead, and a trace of gold and silver (Hanson, 1963).
Geologic map unit (-145.632847641795, 63.2886876227785)
Mineral deposit model Polymetallic veins (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Age of mineralization Pennsylvanian or younger.

Production and reserves

Workings or exploration Samples of veins assay as much as 0.8 percent copper, 0.3 percent lead, and a trace of gold and silver (Hanson, 1963).
Indication of production None

References