|Quadrangle map, 1:250,000-scale||HW|
|Quadrangle map, 1:63,360-scale||A-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is at the east end of Koiyaktot Mountain about 0.9 mile southeast of peak 1302 (in meters). It is near the center of section 9, T. 32 N., R. 12 E.|
Geologic descriptionThe rocks in the area are northwest-trending, southwest-dipping Upper Devonian to Lower Mississippian Kanayut Conglomerate and Noatak Sandstone that are repeated by thrust faults. Quartz veins and breccia with sphalerite and galena occur in siltstone of the Noatak Sandstone (Kurtak and others, 1995). The mineralization occurs in float and rubblecrop of unknown extent along a north-trending zone. Samples contained up to 39.9 percent lead, 23.9 percent zinc, 1,404 parts per million (ppm) cadmium, and 1,838 grams of silver per tonne. A breccia sample contained 1,3756 ppm copper and one sample of sphalerite and galena contained more than 2,000 ppm antimony.
|Geologic map unit||(-156.1410867155, 68.1885984031175)|
|Mineral deposit model||Remobilized, lead-zinc sandstone deposit?|
|Age of mineralization||Possibly Mississippian by analogy with other lead-zinc deposits in the western Brooks Range.|
|Alteration of deposit||Not noted.|
|Workings or exploration||Only sampling and mapping by the U.S. Bureau of Mines.|
|Indication of production||None|
Additional commentsMAS number 0020200014.
Jansons, Uldis, and Parke, M.A., 1981, 1978 mineral investigations in the Misheguk Mountain and Howard Pass quadrangles: U.S. Bureau of Mines Open-File Report 26-81, 195 p., 1 sheet.
Kurtak, J.M., Meyer, M.P., Hicks, R.W., Werdon, M.B., and Mull, C.G., 1995, Mineral investigations in the Colville Mining District and southern National Petroleum Reserve in Alaska: U.S. Bureau of Mines Open-File Report 8-95, 217 p., 1 sheet, scale 1:250,000.
|Reporters||J.M. Schmidt (U.S. Geological Survey); D.J. Grybeck (Contractor, U.S. Geological Survey)|
|Last report date||4/18/2010|