Unnamed (north flank of Rainbow Ridge)

Occurrence, Active

Commodities and mineralogy

Main commodities Ag; Au; Cu
Other commodities Mo; Pb; Sb
Ore minerals bornite; chalcopyrite; malachite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale B-4
Latitude 63.3467
Longitude -145.7019
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence at an elevation of 2,800 feet at the north end of a canyon about 1.1 miles northeast of the 'Miller Mine' on the Richardson Highway. It is in the NE1/4NE1/4 section 19, T. 18 S., R. 11 E., Fairbanks Meridian. Access to the property is by a dirt road (not shown on the 1984 topographic map) on the east side of the highway approximately 1 mile south of Millers Roadhouse. This occurrence corresponds to locality S101 in table 2 of Nokleberg and others (1991) and is described by Rose (1965, p. 24).

Geologic setting

Geologic description

Rose (1965) described a horizontal quartz vein at this site that assayed 0.46 ounce of gold per ton. Nokleberg and others (1991) collected a composite grab sample of several mineralized quartz veins at the same site; the veins contain chalcopyrite, bornite, and malachite and cut metamorphosed and silicified dacite, volcanic breccia, and basalt. A composite grab sample of the mineralized quartz veins contained 4,800 parts per million (ppm) copper, 400 ppm lead, 30 ppm silver, 1.9 ppm gold, 100 ppm molybdenum, and 300 ppm antimony (Nokleberg and others, 1991). The veins strike north-south and range in thickness from one-half inch to 3 feet; pyrite is disseminated in adjacent iron-stained wall rocks. The host rocks are part of the Slana Spur Formation of Pennsylvanian age (Nokleberg and others, 1991).
This occurrence may be an extension of one at an iron-stained knob across the valley a quarter-mile to the north (MH210).
Geologic map unit (-145.704155517046, 63.3462879474931)
Mineral deposit model Polymetallic vein (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Age of mineralization Permian (?) or younger.
Alteration of deposit The host rocks are silicified; copper minerals are oxidized.

Production and reserves

Workings or exploration
A composite grab sample of the mineralized quartz veins contained 4,800 parts per million (ppm ) copper, 400 ppm lead, 30 ppm silver, 1.9 ppm gold, 100 ppm molybdenum, and 300 ppm antimony (Nokleberg and others, 1991).
The occurrence is on active claims of Northeast Exploration.
Indication of production None

References