The Sheep Creek-1 is a silver, lead, and 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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Sheep Creek-1 MRDS details
Site Name
Primary: Sheep Creek-1
Commodity
Primary: Silver
Primary: Lead
Primary: Zinc
Secondary: Vanadium
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: Occurrence
Operation Type: Unknown
Years of Production:
Organization:
Significant:
Physiography
Not available
Mineral Deposit Model
Model Name: Sedimentary exhalative Zn-Pb
Orebody
Not available
Structure
Not available
Alterations
Alteration Type: L
Alteration Text: Strong sulfurous alteration.
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Sphalerite
Ore: Pyrite
Gangue: Quartz
Comments
Comment (Geology): Geologic Description = The Sheep Creek-1 occurrence is a discontinuous zone of metal-bearing, sulfur-rich shale and siltstone of the Lower Ordovician to Lower Silurian Post River Formation, a unit of the Dillinger subterrane (Bundtzen, Harris, and Gilbert, 1997). The observed shale-hosted mineralization contains graptolites that correspond to the Monograptus spiralus zone or of Lower Silurian age. The mineralized zones occur in distinctive areas where a bright yellow sulfur staining is seeping out of pyrite-rich lamina in the black shale lenses and horizons. Within the sulfur-rich zones, disseminated pyrite, and sphalerite are found in 2 to 4 centimeter thick bands. . Bundtzen, Harris, and Gilbert (1997) regard the Sheep Creek-1 occurrence as a sedimentary exhalitive lead-zinc deposit type; however, it may also be an epigenetic occurrence related to nearby plutonic sources. . Random chip samples reported by Bundtzen, Kline, and Clough (1982) and Bundtzen, Harris, and Gilbert (1997) from four stratiform horizons contained an average 600 ppm lead, 1,700 ppm zinc, 1,000 ppm vanadium, and 2.7 grams/tonne silver. Smith and Albanese (1985) reported a single sample (#2526) from the Sheep Creek-1 occurrence contained 720 ppm lead, 37.1 grams/tonne silver, and 472 ppm antimony.
Comment (Workings): Workings / Exploration = The reporter first recognized the shale-hosted mineralization in 1981 (Bundtzen, Kline, and Clough, 1982). Random chip samples reported by Bundtzen, Kline, and Clough (1982) and Bundtzen, Harris, and Gilbert (1997) from four horizons of shale-hosted mineralization contained an average 600 ppm lead, 1,700 ppm zinc, 1,000 ppm vanadium, and 2.7 grams/tonne silver. Smith and Albanese (1985) reported that a single sample (#2526) from the Sheep Creek-1 occurrence contained 720 ppm lead, 37.1 grams/tonne silver, and 472 ppm antimony.
Comment (Deposit): Model Name = Sedimentary exhalitive Pb-Zn(?) (Cox and Singer, 1986; model 31a).
Comment (Exploration): Status = Inactive
Comment (Geology): Age = Inferred to be Lower Silurian, based on graptolite identification.
Comment (Reference): Primary Reference = Bundtzen, Harris, and Gilbert, 1997
References
Reference (Deposit): 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 pages, one sheet, scale 1:125,000.
Reference (Deposit): Smith, T.E., and Albanese, M.D., 1985, Preliminary prospect examinations in the McGrath B-2, A-3, and A-4 quadrangles, Alaska: Alaska Division of Geological and Geophysical Surveys Public Data File 85-54, 19 pages.
Reference (Deposit): Bundtzen, T.K., Kline, J.T., and Clough, J.G., 1982, Preliminary geologic map of the McGrath B-2 quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Open-File report 149, 22 pages, one sheet, scale 1:63,360.
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