The Rocky Cummins is a silver and gold 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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Rocky Cummins MRDS details
Site Name
Primary: Rocky Cummins
Secondary: Cummins
Commodity
Primary: Silver
Primary: Gold
Secondary: Antimony
Secondary: Tungsten
Secondary: Bismuth
Secondary: Tin
Location
State: Alaska
District: Yentna
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: Low-sulfide Au-quartz vein
Orebody
Not available
Structure
Not available
Alterations
Not available
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Arsenopyrite
Ore: Gold
Ore: Pyrite
Gangue: Quartz
Comments
Comment (Geology): Age = Tertiary; mineralization is interpreted to be linked to the Kahiltna pluton (Tmk), part of the McKinley Sequence, that has been determined to range from 52.3 to 56.2 m.y. in age by K/Ar method (Reed and Lanphere, 1972; Reed and Nelson, 1980).
Comment (Reference): Primary Reference = Clark and Hawley, 1968
Comment (Workings): Workings / Exploration = Some small prospect pits and reconnaissance mapping, stream silt and rock sampling (Clark and Hawley, 1968) are all that have been done here. Clark and Hawley (1968) report samples containing 0.02 to 1.4 ppm Au, up to 20 ppm Ag, with anomalous As, Bi, Sn and W.
Comment (Geology): Geologic Description = Mesozoic graywacke and argillite (KJs, Reed and Nelson, 1980) host steeply dipping, N75W striking, quartz veins in a 30 -foot-wide zone. Minor sporadic gold values occur within this zone, along with traces of silver, bismuth and tin (Cobb and Reed, 1980). Quartz is milky white, locally vuggy with minor pyrite, arsenopyrite, an unidentified gray-brown metallic mineral, white mica and free gold (Clark and Hawley, 1968; Hawley and Clark, 1973). The veins may be related to the Tertiary Kahiltna pluton (Tmk) mapped by Reed and Nelson (1980) to the northwest.? Clark and Hawley (1968) report samples containing 0.02 to 1.4 ppm Au, up to 20 ppm Ag, with anomalous As, Bi, Sn and W. ? Stream sediment samples from four streams in the area between the Tokositna and Kahiltna Glaciers indicate the area is auriferous and could host other prospects (Clark and Hawley, 1968). See TL015.
Comment (Deposit): Model Name = Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a).
Comment (Deposit): Other Comments = This prospect lies within Denali National Park and Preserve.
Comment (Commodity): Ore Material = unknown silver-bearing mineral
Comment (Commodity): Ore Material = unknown silver-bearing mineral
Comment (Geology): Age = Chron age is for McKinley Sequence.
References
Reference (Deposit): Clark, A.L., and Cobb, E.H., 1972, Metallic mineral resources map of the Talkeetna quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-369, 1 sheet, scale 1:250,000.
Reference (Deposit): Reed, B.L., and Nelson, S.W., 1980, Geologic map of the Talkeetna quadrangle: U.S. Geological Survey Miscellaneous Investigations Map I-1174, scale 1:250,000.
Reference (Deposit): Hawley, C.C., and Clark, A.L., 1973, Geology and mineral deposits of the upper Chulitna district, Alaska: U.S. Geological Survey Professional Paper 758-A, p. 1-10, 2 sheets, scale 1:250,000 and 1:500,000.
Reference (Deposit): Cobb, E.H., and Reed, B.L., 1980, Summaries of data and lists of reference to metallic and selected nonmetallic mineral deposits in the Talkeetna quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-884, 106 p.
Reference (Deposit): Clark, A.L., and Hawley, C.C., 1968, Reconnaissance geology, mineral occurrences, and geochemical anomalies of the Yentna district, Alaska: U.S. Geological Survey Open-File Report 68-35, 64 p.
Reference (Deposit): Reed, B.L., Nelson, S.W., Curtin, G.C., and Singer, D.A., 1978, Mineral resources map of the Talkeetna Quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-870-D, 1 sheet, scale 1:250,000.
Reference (Deposit): MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000.
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