Unnamed (head of Ocher Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Other commodities Ag; Au
Ore minerals chalcopyrite; malachite; pyrite

Geographic location

Quadrangle map, 1:250,000-scale TK
Quadrangle map, 1:63,360-scale C-4
Latitude 62.529
Longitude -148.5188
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 3,800 feet at the head of Ocher Creek, an informal name. It is 1.2 miles southwest of VABM Jaina and 2.5 miles northeast of the Talkeetna River, near the center of the E1/2 sec. 24, T. 28 N., R. 4 E., Seward Meridian. The location is accurate to within 1/4 mile. This is locality 48 of Csejtey and Miller (1978).

Geologic setting

Geologic description

This prospect consists of pyrite, chalcopyrite, and malachite in Triassic(?) greenstone interlayered with phyllite and argillite (Anderson, 1969). In places the phyllite is pyritic and gossanous, with botryoidal crusts of limonite and local brown boxworks formed by the leaching of sulfides. Sulfide-bearing quartz samples contain up to 3 parts per million silver, 0.22 part per million gold, and 750 parts per million copper.
Geologic map unit (-148.52101796416, 62.5285231429842)
Mineral deposit model Basaltic Cu? (Cox and Singer, 1986; model 23?)
Mineral deposit model number 23?
Alteration of deposit Iron and copper staining.

Production and reserves

Workings or exploration Only limited surface sampling (Anderson, 1969).
Indication of production None

References

MRDS Number A012177

References

Reporters R.K. Rogers (U. S. Geological Survey contractor)
Last report date 10/1/2002