Unnamed (north of Fisher Creek)

Occurrence, Probably inactive

Commodities and mineralogy

Main commodities Cu
Ore minerals azurite; chalcopyrite; malachite
Gangue minerals carbonate; quartz

Geographic location

Quadrangle map, 1:250,000-scale CY
Quadrangle map, 1:63,360-scale A-4
Latitude 65.05
Longitude -142.66
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is location 1 of Cobb (1972 [MF-390]). It is on a northwest-facing hillside at an elevation of about 3,100 feet, about 1.75 miles north of Fisher Creek, in section 33, T. 3 N., R. 25 E., of the Fairbanks Meridian. The coordinates are for the center of the prospect. The location is accurate to within one mile.

Geologic setting

Geologic description

This unnamed occurrence is near a high-angle normal fault between Paleozoic to Precambrian pelitic schist on the south and Paleozoic phyllitic argillite on the north (Dover and Miyaoka, 1988). The occurrence consists of chalcopyrite and secondary copper minerals in quartz and carbonate veins in greenschist, greenstone, and thin carbonate layers. The vein material is estimated to be less than 3 percent of the exposed rock (Clark and Foster, 1971).
Geologic map unit (-142.662351963116, 65.0496717984937)
Mineral deposit model Cu-quartz vein.
Alteration of deposit There is local oxidation of copper minerals.

Production and reserves

Workings or exploration The area was mapped and sampled in the mid-1970s (Clark and Foster, 1971).
Indication of production None

Additional comments

This site is within the Yukon-Charley Rivers National Preserve.

References