The Rock Glacier is a copper 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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Rock Glacier MRDS details
Site Name
Primary: Rock Glacier
Commodity
Primary: Copper
Secondary: Iron
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: Skarn Cu
Orebody
Not available
Structure
Not available
Alterations
Alteration Type: L
Alteration Text: Propylitization.
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Pyrrhotite
Ore: Pyrite
Ore: Malachite
Gangue: Quartz
Gangue: Epidote
Gangue: Chlorite
Comments
Comment (Exploration): Status = Inactive
Comment (Commodity): Gangue = Carbonate
Comment (Geology): Age = K-Ar age of 37.9 Ma published by Gilbert and others (1990).
Comment (Deposit): Other Comments = Similar to Rat Fork-Headwall and Rat Fork-Base prospects (MG058; MG059) in McGrath B-2 quadrangle.
Comment (Deposit): Model Name = Copper skarn(?) (Cox and Singer, 1986; model 18b).
Comment (Workings): Workings / Exploration = No assay data is available for the Rock Glacier occurrence.
Comment (Reference): Primary Reference = Gilbert and others, 1990
Comment (Geology): Geologic Description = Pyrite-rich gossan zones were noted by Gilbert and others (1990) in a composite dike swarm, andesitic flows, and lappilli tuffs within the Windy Fork volcanic complex (Bundtzen, Harris, and Gilbert, 1997). Pyrite and pyrrhotite, which locally comprise up to 50 percent of the gossan-rich zones, are accompanied by carbonates, chlorite, epidote, and quartz. Individual gossan bodies are irregular in dimension, and reach maximum lengths of 40 meters Gangue mineralogy suggests formation by introduction of metasomatic fluids; i.e., skarns. Malachite staining was observed in some of the fractured hornfels in the gossan zones. No assay data is available for the Rock Glacier occurrence.
References
Reference (Deposit): Gilbert, W.G., Solie, D.N., Kline, J.T., and Dickey, D.B., 1990, Geologic map of the McGrath B-3 quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Professional Report 102, 2 sheets, scale 1:63,360.
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.
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