Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Other commodities Ag; Au; Fe
Gangue minerals epidote; quartz

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale A-5
Latitude 63.1977
Longitude -146.3645
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of 4,000 feet northwest of the west end of Seven Mile Lake, in the SW1/4NW1/4 section 11, T. 20 S., R. 7 E., Fairbanks Meridian. It is Kardex site number KX68-086 (Heiner and Porter, 1972).

Geologic setting

Geologic description

The area near the Richards claims is mostly colluvium overlying Nikolai Greenstone of Late Triassic age (Nokleberg and others, 1991). Bedrock, where exposed, consists of metabasalt, locally altered, cut by quartz-epidote veins. Sample 2811 of limonite-stained altered metabasalt cut by quartz veins was essentially barren (Kurtak and others, 1992, table A23), but the U.S. Bureau of Mines spent little time in the area and noted that more prospecting was needed.
The Richards claims were located for copper, iron, gold, and silver (Heiner and Porter, 1972). Primary ore mineralogy is unknown.
Geologic map unit (-146.366756863521, 63.1972709775963)
Mineral deposit model Basaltic Cu? (Cox and Singer, 1986; model 23?).
Mineral deposit model number 23?
Alteration of deposit Locally 'altered', probably propylitized basalt (Kurtak and others, 1992).

Production and reserves

Workings or exploration
The ten Richards claims were staked in 1964-1966 by Northland Mines (Heiner and Porter, 1972; Kurtak and others, 1992). A sample collected from altered metabasalt cut by quartz veinlets was barren (Kurtak and others, 1992).
The area is now covered by claims staked by MAN Resources, which mostly are for platinum and associated metals (W.T. Ellis, written communication, 2001).
Indication of production None

Additional comments

Kurtak and others (1992) proposed that additional prospecting was needed.