Idle Claim, Columbia Red Metals Group

Prospect, Inactive

Commodities and mineralogy

Main commodities Ag; As; Cu; Pb; Zn
Ore minerals arsenopyrite; chalcopyrite; galena; sphalerite

Geographic location

Quadrangle map, 1:250,000-scale AN
Quadrangle map, 1:63,360-scale A-1
Latitude 61.11
Longitude -147.14
Nearby scientific data Find additional scientific data near this location
Location and accuracy 2,000 ft east of the eastern shore of Kadin Lake. Accurate within 1,000 feet. This is locality A-2 of Jansons and others (1984).

Geologic setting

Geologic description

Two felsic dikes having chalcopyrite, galena, and sphalerite present in shears. Arsenopyrite occurs within 1/8 inch veinlets in a 15 ft wide felsic dike (Jansons and others, 1984). The felsic dikes intrude sandstone, siltstone, and mudstone of the Tertiary Orca Group.
The chip samples contained 370 ppm to 2.85 percent Zn, 205 ppm to 0.7 percent Cu, 4.4 ppm to 22 ppm Ag, 200 ppm to 0.22 percent Pb, and 72 ppm to 16.5 percent As (Jansons and others, 1984).
Geologic map unit (-147.142070380804, 61.1094492522365)
Mineral deposit model Chugach-type low-sulfide Au-quartz vein? (Bliss, 1992; model 36a.1?).
Mineral deposit model number 36a.1?
Age of mineralization Paleocene or younger; the veins cut felsic dikes which intrude sandstone, siltstone, and mudstone of the Tertiary Orca Group.

Production and reserves

Workings or exploration Development has included an 80 ft long tunnel and open pits. Chip samples contained 370 ppm to 2.85 percent Zn, 205 ppm to 0.7 percent Cu, 4.4 ppm to 22 ppm Ag, 200 ppm to 0.22 percent Pb, and 72 ppm to 16.5 percent As. Low mineral development potential (Jansons and others, 1984).
Indication of production None
Reserve estimates Inferred reserves are 350 tons at 2.27 percent Zn (Jansons and others, 1984).

References

MRDS Number A106211
Reporters D.P. Bickerstaff (USGS contractor); S.W. Huss (USGS)
Last report date 7/30/1998