|Quadrangle map, 1:250,000-scale||CY|
|Quadrangle map, 1:63,360-scale||A-4|
|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 descriptionThis 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.|
|Workings or exploration||The area was mapped and sampled in the mid-1970s (Clark and Foster, 1971).|
|Indication of production||None|
Additional commentsThis site is within the Yukon-Charley Rivers National Preserve.
Clark, S.H.B., and Foster, H.L., 1971, Geochemical and geological reconnaissance in the Seventymile River area, Alaska: U.S. Geological Survey Bulletin 1315, 21 p.
Cobb, E.H., 1972, Metallic mineral resources map of the Charley River quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-390, 1 sheet, scale 1:250,000.
Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Charley River and Coleen quadrangles, Alaska: U.S. Geological Survey Open-File Report 76-632, 45 p.
|Reporters||C.E. Cameron (ADGGS)|
|Last report date||4/7/2000|