|Quadrangle map, 1:250,000-scale||MH|
|Quadrangle map, 1:63,360-scale||A-4|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is at an elevation of 3,950 feet on the southeast flank of Sugarloaf Mountain. It is at the center of SW1/4 section 31, T. 20 S., R. 10 E., Fairbanks Meridian. It corresponds to locality 4 of Rose (1966 [ADMM GR 19]).|
Geologic descriptionPermian black shale and calcareous black shale at this location contain abundant pyrite, including lenses of almost massive pyrite as much as one-half inch thick (Rose, 1966 [ADMM GR 19]). Analysis of a chip sample showed only 35 parts per million (ppm) copper, 105 ppm zinc, 20 ppm lead, and 9 ppm molybdenum (Rose, 1966 [GR 19]). L.D. Hulbert (oral communication, 2001) suggested that the mineralization could be magmatic, related to the emplacement of high-level metal-depleted gabbroic sills that may be feeders to the Nikolai Greenstone of Late Triassic age.
|Geologic map unit||(-145.91504231924, 63.1341772235514)|
|Mineral deposit model||Shale-hosted sulfide.|
|Age of mineralization||Permian or Late Triassic.|
|Workings or exploration||
Lithochemical sampling by MAN Resources indicates extreme metal depletion.The occurrence is on active claims of MAN Resources.
|Indication of production||None|
|Reporters||W.T. Ellis (Alaska Earth Science), C.C. Hawley (Hawley Resource Group), and W.J. Nokleberg (USGS)|
|Last report date||6/17/2002|