Long Creek

Prospect, Active

Commodities and mineralogy

Main commodities Ag; Au; Cu; Pb; Zn
Ore minerals arsenopyrite; chalcopyrite; galena; pyrite; sphalerite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale HE
Quadrangle map, 1:63,360-scale A-6
Latitude 63.18
Longitude -149.67
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Long Creek prospect is at an elevation of 3,700 feet, about a mile west of Long Creek approximately 7 miles upstream from its junction with the West Fork Chulitna River. The map site is near the center of sec. 16, T. 20 S., R. 11 W., of the Fairbanks Meridian. This is locality 15 of Cobb (1978: OFR 78-1062).

Geologic setting

Geologic description

This prospect is near the faulted contact between Devonian mafic intrusive rocks and Upper Devonian to Lower Triassic tuffaceous chert, volcanic conglomerate, graywacke and shale, and limestone (Wilson and others, 1998). Both units are intruded by Upper Cretaceous (?) porphyry dikes. The deposit consists of massive quartz-arsenopyrite veins that also contain minor amounts of galena, sphalerite, pyrite and chalcopyrite. In addition to the veins, rocks also contain up to 2% disseminated sulfides in a 600- feet by 300-foot area.
Geologic map unit (-149.672290132815, 63.1795247725168)
Mineral deposit model Polymetallic vein (Cox and Singer, 1986; model 22c)
Mineral deposit model number 22c
Age of mineralization Probably Late Cretaceous (?) or younger, assuming that the deposit is related to the diorite dikes.

Production and reserves

Workings or exploration Surface trenches and soil grids.
Indication of production None

References

MRDS Number A011319

References

Reporters N. Van Wyck (Stevens Exploration Management Corporation)
Last report date 4/7/2000