The Bear Pass is a zinc mine located in Alaska.
About the MRDS Data:
All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.
Mine Info
Bear Pass MRDS details
Site Name
Primary: Bear Pass
Commodity
Primary: Zinc
Secondary: Cadmium
Secondary: Molybdenum
Secondary: Arsenic
Location
State: Alaska
District: McGrath
Land Status
Not available
Holdings
Not available
Workings
Not available
Ownership
Not available
Production
Not available
Deposit
Record Type: Site
Operation Category: Prospect
Operation Type: Unknown
Years of Production:
Organization:
Significant:
Physiography
Not available
Mineral Deposit Model
Model Name: Mississippi Valley, S.E. Missouri Pb-Zn
Orebody
Not available
Structure
Not available
Alterations
Not available
Rocks
Role: Host
Age Type: Host Rock
Age Young: Early Devonian
Analytical Data
Not available
Materials
Not available
Comments
Comment (Exploration): Status = Inactive
Comment (Reference): Primary Reference = Andrews and Rishel, 1982
Comment (Commodity): Gangue = Secondary carbonates
Comment (Workings): Workings / Exploration = The Bear Pass prospect was found by WGM Inc. and Patino Ltd. during the late 1970s while conducting base metal exploration on lands selected by Doyon Ltd. In both mineralized areas, gossan comprises about 5 percent of available float. A grab sample from an outcrop of solution breccia mineralization contains 4.38 percent zinc and 100 ppm cadmium. Clautice and others (1993) reports grab sample assays of 2.00 percent zinc, 276 ppm arsenic, and 32 ppm molybdenum.
Comment (Geology): Ore Material = Iron Oxides
Comment (Geology): Age = Host rock is Lower Devonian based on fossil control in 'Dda' unit. The age of mineralization is unknown.
Comment (Deposit): Other Comments = See Starship (MD043), Spring Ridge (MD047), Beaver (MD048), and Bermuda (MD045) Mississippi Valley Type showings in Medfra quadrangle. The Bear Pass prospect is on land selected or conveyed to Doyon Ltd. For further information, contact Doyon Ltd. at 210 1st Ave., Fairbanks, Alaska, 99701.
Comment (Geology): Geologic Description = Two zones of zinc-bearing, iron oxide gossan occur in areas of 150 feet by 60 feet (46 m by 18 m) and 150 feet by 40 feet (46 m by 12 m) on a prominant ridge top. Mineralization is hosted in a well-developed solution breccia of the Whirlwind Creek Formation of Dutro and Patton (1982); this is in unit 'Dda' of Andrews and Rishel (1982). Host rock is Lower Devonian based on fossil control in 'Dda' unit; age of mineralization is unknown. In both mineralized areas, gossan comprises about 5 percent of available float. A grab sample from an outcrop of solution-breccia mineralization contains 4.38 percent zinc and 100 ppm cadmium (Andrews and Rishel, 1982). Clautice and others (1993) reports grab sample assays of 2.00 percent zinc, 276 ppm arsenic, and 32 ppm molybdenum.
Comment (Deposit): Model Name = Southeast Missouri Pb-Zn (Cox and Singer, 1986; model no. 32a) or Mississippi Valley Type
References
Reference (Deposit): Andrews, Tom, and Rishel, John, 1982, Annual Report for 198, Reef Ridge I-to-XIII Project Areas, Kuskokwim Block, Alaska: Anchorage, Alaska, WGM Inc., Project Report 4, 45 pages, two sheets at 1:63,360 and 1:20,000 scales. (Report held by Doyon, Limited, Fairbanks, Alaska.)
Reference (Deposit): Clautice, K.H., Bowman, N.D., Clough, J.G., Gilbert, W.G., Kline, J.T., Smith, T.E., and Blodgett, R.B., 1993, Land selection Unit 8 (Kantishna River, Ruby, and Medfra quadrangles): References, lead isotope, geochemical and major oxide data: Alaska Division of Geological and Geophysical Surveys, 42 p., 1 sheet, scale 1:250,000.
Reference (Deposit): Schmidt, J.M., 1997, Shale-hosted Zn-Pb-Ag and barite deposits of Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska, 1997: Economic Geology Monograph 9, p. 35-65.
Reference (Deposit): Patton, W.W., Jr., Moll, E.J., Dutro, J.T., Jr., Silberman, M.L., and Chapman, R.M., 1980, Preliminary geologic map of Medfra quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-811-A, 1 sheet, scale l:250,000.
Reference (Deposit): Dutro, T.T. Jr., and Patton,W.W. Jr., 1982, New Paleozoic Formations in the northern Kuskokwim Mountains, west-central Alaska: U.S. Geological Survey Bulletin 1529-H, p. H13-H22.
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