|Quadrangle map, 1:250,000-scale||CH|
|Quadrangle map, 1:63,360-scale||B-3|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The site is located at an elevation of about 3,800 ft approximately 5 3/4 miles southeast of Chandalar near the head of Big Joe Creek, a tributary to Big Creek (sec. 31, T. 31 N., R. 3 W., of the Fairbanks Meridian). The location is approximated from loc. 8 in DeYoung (1978). The location is accurate within a 1-mile radius.|
Geologic descriptionThe prospect is described only as gold in a quartz vein (Brosgé and Reiser, 1972) in an area mapped as Devonian(?) black, fine-grained quartz-muscovite-chlorite schist with intercalated Devonian(?) green, schistose hornblende diorite and pyroxene diorite sills and andesitic flows(?) (Brosgé and Reiser, 1964). A rock sample from this occurrence contained 0.04 to 0.079 ppm Au. No other descriptive information is available for this occurrence.
|Geologic map unit||(-148.312722897058, 67.4596121600108)|
|Mineral deposit model||Low-sulfide Au-quartz veins? (Cox and Singer, 1986; model 36a?).|
|Mineral deposit model number||36a?|
|Age of mineralization||Middle Cretaceous(?) based on arguments by Dillon (1982) that the age of emplacement of the gold-bearing quartz veins of the Koyukuk and Chandalar districts was between the Neocomian metamorphism of the Devonian host rocks and their erosional unroofing and cooling in Albian time.|
|Workings or exploration||No information available.|
|Indication of production||None|
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.
Dillon, J.T., 1982, Source of lode and placer gold deposits of the Chandalar and upper Koyukuk Districts: Alaska Division of Geological and Geophysical Surveys Open-File Report AOF-158, 25 p., 1 sheet, scale 1:250,000.
|Reporters||J.M. Britton (Anchorage)|
|Last report date||11/17/1999|