|Quadrangle map, 1:250,000-scale||CH|
|Quadrangle map, 1:63,360-scale||A-4|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The West Fork occurrence is at an elevation of about 1,700 ft on the north side of the West Fork Chandalar River approximately 6 miles west of its confluence with the North Fork Chandalar River (NW1/4 sec. 6, T. 27 N., R. 5 W., of the Fairbanks Meridian ). The location is accurate within a 1/2-mile radius.|
Geologic descriptionOccurrence is described only as Cu minerals in Devonian(?) volcanic rocks (DeYoung, 1978). An analysis of a rock sample collected by Brosgé and Reiser (1972) from this location showed 0.04 to 0.79 ppm Au and 1.0 to 3.0 ppm Ag. The occurrence also coincides with a location noted as an occurrence of metallic minerals (Cu) by Brosgé and Reiser (1964). No other data on the mineralization is available. The host rock unit is described as pyroxene andesite flows and pyroxene diorite intrusives, hornblende andesite pyroclastics, and some diabase and gabbro.
|Geologic map unit||(-148.732702168297, 67.1995954751987)|
|Indication of production||None|
Additional commentsThe rock sample described by Brosgé and Reiser (1972) that contained 1 to 3 ppm Ag and 0.04 to 0.079 ppm Au appears to be from the general area of the West Fork prospect. The occurrence also probably coincides with the location noted as an occurrence of metallic minerals (Cu) plotted by Brosgé and Reiser (1964) along the lower West Fork Chandalar River.
Berg, H.C., and Cobb, E.H., 1967, Metalliferous lode deposits of Alaska: U.S. Geological Survey Bulletin 1246, 254 p.
Cobb, E.H., 1972, Metallic mineral resources map of the Chandalar quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-457, 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 Chandalar and Wiseman quadrangles, Alaska: U.S. Geological Survey Open-File Report 76-340, 205 p.
Cobb, E.H., and Cruz, E.L., 1983, Summaries of data and lists of references to metallic and selected nonmetallic mineral deposits in the Chandalar quadrangle, Alaska: U.S. Geological Survey Open-File Report 83-278, 91 p.
DeYoung, J.H., Jr., 1978, Mineral resources map of the Chandalar quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-878-B, 2 sheets, scale 1:250,000.
|Reporters||J.M. Britton (Anchorage)|
|Last report date||11/17/1999|