|Quadrangle map, 1:250,000-scale||EA|
|Quadrangle map, 1:63,360-scale||A-2|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is on the east shoreline of the South Fork of the Fortymile River, about 1.2 miles upstream from the mouth of Walker Fork. The occurrence is in section 25, T. 27 N., R. 18 E., of the Copper River Meridian. The location is accurate.|
Geologic descriptionThis occurrence is in upper Paleozoic greenschist-facies metasedimentary and metavolcanic rocks (Werdon and others, 2001). Light-gray, sheared, siliceous muscovite-quartz phyllite is cut by a fault zone with pyrite-bearing quartz veins that contain 85 ppb gold, 4.2 ppm silver, 36 ppm arsenic, and 10 ppm bismuth (Szumigala and others, 2000).
|Geologic map unit||(-141.79648118669, 64.0876736181965)|
|Mineral deposit model||Fault-hosted gold.|
|Age of mineralization||Late Paleozoic or younger.|
|Alteration of deposit||Muscovite-quartz phyllite is sheared and silicified.|
|Indication of production||None|
Szumigala, D.J., Newberry, R.J., Werdon, M.B., Finseth, B.A., Pinney, D.S., and Flynn, R.L., 2000, Major-oxide, minor-oxide, trace-element, and geochemical data from rocks collected in a portion of the Fortymile mining district, Alaska, in 1999: Alaska Division of Geological and Geophysical Surveys Raw-Data File 2000-1, 24 p., 2 sheets, scale 1:63,360.
|Last report date||5/1/2002|