|Quadrangle map, 1:250,000-scale||MG|
|Quadrangle map, 1:63,360-scale||B-2|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The occurrence is in a saddle separating two northeast-trending ridgelines at an elevation of 5,500 feet (1,677 m) in the NW1/4 sec. 20, T. 26 N., R. 25 W., of the Seward Meridian. The reporter visited the site in 1981.|
Geologic descriptionThis unnamed occurrence is hosted in a northwest-trending northward-dipping mafic sill of Late Triassic (?) age, a feeder for mafic volcanics of the Tatina River Volcanics, a unit of the Mystic subterrane. Unidentified, brassy, disseminated sulfides - probably iron sulfide - occur at the base of the mafic sill. Foley (1987) reports values of 210 ppm copper, 56 ppm cobalt, 330 ppm zinc, and 0.5 grams/tonne silver from the sulfide-bearing sills.
|Geologic map unit||(-153.951220088526, 62.3323839683999)|
|Mineral deposit model||Disseminated Cu-Ni-Co (Cox and Singer, 1986; model 5b).|
|Mineral deposit model number||5b|
|Alteration of deposit||None.|
|Workings or exploration||The sill swarm was mapped by the reporter in 1981 (Bundtzen, Kline, and Clough, 1982). Foley (1987) reports values of 210 ppm copper, 56 ppm cobalt, 330 ppm zinc, and 0.5 grams/tonne silver from the sulfide-bearing sill.|
|Indication of production||None|
Additional commentsSimilar to Robert's PGM (MG030), Unnamed (MG048), and Chip-Loy (MG032) deposits and prospects.
Bundtzen, T.K., Harris, E.E., and Gilbert, W.G., 1997, Geologic Map of the eastern McGrath quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 97-14, 34 p., 1 sheet, scale 1:125,000.
Bundtzen, T.K., Kline, J.T., and Clough, J.G., 1982, Preliminary geologiy of the McGrath B-2 quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Open-File report 149, 22 p., 1 sheet, scale 1:40,000.
|Reporters||T.K. Bundtzen (Pacific Rim Geological Consulting)|
|Last report date||12/8/1998|