The Spring Ridge 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
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Spring Ridge MRDS details
Site Name
Primary: Spring Ridge
Commodity
Primary: Zinc
Secondary: Lead
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
Alteration Type: L
Alteration Text: Secondary dolomite in fractures.
Rocks
Role: Host
Age Type: Host Rock
Age Young: Late Silurian
Analytical Data
Not available
Materials
Ore: Smithsonite
Gangue: Dolomite
Comments
Comment (Exploration): Status = Inactive
Comment (Deposit): Model Name = Southeast Missouri Pb-Zn (Cox and Singer, 1986; model no. 32a) or Mississippi Valley Type
Comment (Deposit): Other Comments = See Starship (MD043), Bermuda (MD045), and Bear Pass (MD044) Mississippi Valley Type occurrences in Medfra quadrangle. The Spring Ridge prospects are on land selected or conveyed to Doyon Ltd. For further infoemation, contact Doyon Ltd. at 210 1st Ave., Fairbanks, Alaska, 99701.
Comment (Geology): Age = Host rock is inferred to be Latest Silurian based on fossils (Dutro and Patton, 1982); however, the age of the mineralization is unknown.
Comment (Reference): Primary Reference = Andrews and Rishel, 1982
Comment (Geology): Geologic Description = At the Spring Ridge prospects, smithsonite-bearing gossans occur on two adjacent ridge spurs about 1,000 feet (300 m) apart, and about 30 feet by 50 feet (9 m by 15 m) in size, in the lower part of the Whirlwind Creek Formation of Dutro and Patton (1982); this is unit 'Dda' of Andrews and Rishel (1982). Mineralization in both areas occur in well developed solution breccias in dolomite. Host rock is inferred to be Latest Silurian based on fossils; however, the age of the mineralization is unknown. A grab sample from surface exploration along the eastern spur yielded 2.72 percent zinc and 0.14 percent lead. Two grab samples from the western spur contained 9.07 percent zinc and 12.00 percent zinc respectively; no lead was detected in either sample (Andrews and Rishel, 1982).
Comment (Workings): Workings / Exploration = The Spring Ridge prospects were found by WGM Inc. and Patino Ltd. during base metal exploration conducted in the 1970s on lands selected by Doyon Ltd. (Andrews and Rishel, 1982). A grab sample from surface exploration along the eastern spur yielded 2.72 percent zinc and 0.14 percent lead. Two grab samples from the western spur contained 9.07 percent zinc and 12.00 percent zinc respectively; no lead was detected in either sample.
References
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.
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): 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): 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.
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