1. Mineral Resources
  2. Online Spatial Data
  3. Alaska Resource Data File (ARDF)

Long Creek

Prospect, Active

Map
KML
XML
GeoJSON

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

Balen, M.D., 1990, Geochemical sampling results from Bureau of Mines investigations in the Valdez Creek mining district, Alaska: U.S. Bureau of Mines Open-File Report 34-90, 218 p., 2 sheets, scale 1:63,360.
Clark, A.L., and Cobb, E.H., 1972, Metallic mineral resources map of the Healy quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-394, 1 sheet, scale 1:250,000.
Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Healy quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-1062, 113 p.
Hawley, C.C., and Clark, A.L., 1973, Geology and mineral deposits of the Chulitna -Yentna mineral belt, Alaska: U.S. Geological Survey Professional Paper 758-A, p. A1-A10, 2 plates, scale 1:250,000 and 1:500,000.
Hawley, C.C., and Clark, A.L., 1974 (1975), Geology and mineral deposits of the upper Chulitna district, Alaska: U.S. Geological Survey Professional Paper 758-B, p. B1-B47, 2 plates, scale 1:12,000 and 1:48,000.
Hawley, C.C., and others, 1978, Mineral appraisal of lands adjacent to Mt. McKinley National Park, Alaska. Contract No. JO166107: U.S. Bureau of Mines Open-File Report 24-78, 274 p., 12 sheets.
Hawley, C.C., Clark, A.L., Herdrick, M.A., and Clark, S.H.B., 1969, Results of geological and geochemical investigations in an area northwest of the Chulitna River, central Alaska Range: U.S. Geological Survey Circular 617, 19 p.
Kurtak, J.M., Balen, M.D., and Fechner, S.A., 1988, Results of 1987 Bureau of Mines investigations in the Valdez Creek mining district, Alaska: U.S. Bureau of Mines Open-File Report 43-88, 132 p., 2 sheets.
Kurtak, J.M., Southworth, D.D., Balen, M.D., and Clautice, K.H., 1991, Mineral investigations in the Valdez Creek Mining District, south-central Alaska: U.S. Bureau of Mines Open-File Report 1-92, 658 p., 2 sheets, scale 1:250,000.
Ross, C.P., 1933, The Valdez Creek mining district, Alaska: U.S. Geological Survey Bulletin 849-H, p.425-468.
Wilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of central (interior) Alaska: U.S. Geological Survey Open-File Report 98-133, 76 p., 3 sheets, scale 1:500,000.
Reporters N. Van Wyck (Stevens Exploration Management Corporation)
Last report date 4/7/2000