Mine detail: North Bradfield River

Previously called 'Ptarmigan'

Location:	Bradfield Canal County, Alaska, United States, North America
Lat / long:	56.38576, -131.39181
dep_id:	10308512
Commodity type:	metallic
Major mineral:	Copper, Iron
Operation type:	Unknown
Development status:	Prospect
ore:	Chalcopyrite, Hematite, Magnetite, Malachite, Pyrrhotite
gangue:	Calcite
model:	62: Skarn Fe
alteration:	Calc-silicate skarn is developed in marble units; local iron staining
Reporter:	H. C. Berg
References:	Deposit:: MacKevett, E.M., Jr., and Blake, M.C., Jr., 1963, Geology of the North Bradfield River iron prospect, southeastern Alaska: U.S. Geological Survey Bulletin 1108-D, p. D1-D21. Deposit:: Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Bradfield Canal quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-922, 98 p. Deposit:: U.S. Geological Survey, 1979, Aeromagnetic map of the Petersburg area, Alaska: U.S. Geological Survey Open-File Report 79-832, 1 sheet, scale 1:250,000. Deposit:: Elliott, R.L., and Koch, R.D., 1981, Mines, prospects, and selected metalliferous mineral occurrences in the Bradfield Canal quadrangle, Alaska: U.S. Geological Survey Open-File Report 81-728-B, 23 p., 1 sheet, scales 1:250,000 and 1:63,360. Deposit:: Sonnevil, R.A., 1981, New data concerning the geology of the North Bradfield River iron prospect, southeastern Alaska, in Albert, N.R.D., and Hudson, Travis, eds., The United States Geological Survey in Alaska, Accomplishments during 1979: U.S. Geological Survey Circular 823B, p. B117-B118. Deposit:: Koch, R.D., 1996, Reconnaissance geologic map of the Bradfield Canal quadrangle, southeastern Alaska: U.S. Geological Survey Open-File Report 81-728-A, 35 p., 1 sheet, scale 1:250,000. Deposit:: Koch, R.D., 1997, Metalliferous mineral resource potential in the Bradfield Canal quadrangle, southeastern Alaska: U.S. Geological Survey Open-File Report 97-271, 57 p., 1 sheet, scale 1:250,000.