Prospect, Probably inactive
|Quadrangle map, 1:250,000-scale||HE|
|Quadrangle map, 1:63,360-scale||A-6|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This prospect is at an elevation of 6,000 feet on the divide between upper Partin and upper Shotgun creeks. It is in the north-central part of sec. 25, T. 21 S., R. 13 W., of the Fairbanks Meridian. The location of this prospect is known to within 0.25 miles. This is location 24 of Cobb (1978: OFR 78-1062). It is identified by Hawley and others (1978), and incorporated with locality E-34 of Balen (1990: OFR 34-90).|
Geologic descriptionThe country rocks in the area of the prospect consists of several hundred meters of Upper Triassic limestone and marble, interbedded with altered, amygdaloidal basalt. The strata are intruded by biotite-quartz diorite porphyry of Late Cretaceous to Early Tertiary age. The deposit consists predominantly of skarn bodies, up to 440 feet long and 3 to 20 feet thick, in an area about 3,000 feet long and 1,000 feet wide. The skarn contains pyrrhotite, up to 5% chalcopyrite, and as much as 2 ounces of gold per ton. Arsenopyrite and stibnite occur both in the skarn and in quartz-arsenopyrite-stibnite veins. Samples from shallow trenches contain up to 0.7% copper, 0.7% antimony, 300 ppm silver, and 63 ppm gold.
|Geologic map unit||(-149.954284222014, 63.0705167185332)|
|Mineral deposit model||Cu skarn (Cox and Singer, 1986; model 18b)|
|Mineral deposit model number||18b|
|Age of mineralization||Late Cretaceous or younger.|
|Alteration of deposit||High temperature skarn.|
|Workings or exploration||There has been surface exploration only. The skarn contains pyrrhotite, up to 5% chalcopyrite, and as much as 2 ounces of gold per ton. Arsenopyrite and stibnite occur both in the skarn and in quartz-arsenopyrite-stibnite veins. Samples from shallow trenches contain up to 0.7% copper, 0.7% antimony, 300 ppm silver, and 63 ppm gold.|
|Indication of production||None|
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.
|Reporters||N. Van Wyck (Stevens Exploration Management Corporation)|
|Last report date||4/7/2000|