Unnamed (northeast wall of Eldridge Glacier)

Occurrence, Probably inactive

Commodities and mineralogy

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

Geographic location

Quadrangle map, 1:250,000-scale HE
Quadrangle map, 1:63,360-scale A-6
Latitude 63.01
Longitude -149.99
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 2,400 feet in a stream valley draining the northeast wall of Eldridge Glacier. It is in sec. 14, T. 22 S., R. 13 W., of the Fairbanks Meridian. The localion is accurate to within 0.5 mile. This is locality 27 of Cobb (1978: OFR 78-1062).

Geologic setting

Geologic description

The country rocks in the area of this occurrence are a tectonically intermixed assemblage of Upper Devonian serpentinite, basalt, chert, and gabbro. The occurrence consists of massive pyrite and chalcopyrite in irregular and veinlike masses in serpentinite. Some of the chalcopyrite is oxidized to malachite. Rock samples contained 15 ppm silver, 0.1 ppm gold, 50 ppm nickel and 7.5% copper (Hawley and Clark, 1974). The sulfide minerals herein are assumed to be remobilized syngenetic magmatic segregations in the mafic host rocks.
Geologic map unit (-149.992280150589, 63.009514144386)
Mineral deposit model Cyprus massive sulfide (Cox and Singer, 1986; model 24a)
Mineral deposit model number 24a
Age of mineralization Probably Late Devonian, remobilized in Late Mesozoic or Tertiary.

Production and reserves

Workings or exploration Rock samples contained 15 ppm silver, 0.1 ppm gold, 50 ppm nickel and 7.5% copper (Hawley and Clark, 1974).
Indication of production None

References