The Crumb Gulch is a gold and antimony 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
Crumb Gulch MRDS details
Site Name
Primary: Crumb Gulch
Secondary: Unnamed (north of upper Crumb Gulch)
Commodity
Primary: Gold
Primary: Antimony
Secondary: Copper
Location
State: Alaska
District: Nizina
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
Not available
Orebody
Not available
Structure
Not available
Alterations
Not available
Rocks
Name: Diorite
Role: Associated
Age Type: Associated Rock
Age Young: Pliocene
Name: Diorite
Role: Associated
Age Type: Host Rock
Age Young: Late Cretaceous
Analytical Data
Not available
Materials
Ore: Gold
Ore: Chalcopyrite
Ore: Realgar
Ore: Stibnite
Comments
Comment (Exploration): Status = Inactive
Comment (Workings): Workings / Exploration = Explored by two short adits and surface workings. Grab samples assayed as high as: >10,000 ppm Sb, 66 ppm Au, 15 ppm Ag (MacKevett, 1976).
Comment (Geology): Geologic Description = Veins up to 30 cm thick in shear zone cutting hornfelsed Cretaceous sedimentary rocks near Tertiary granodiorite pluton. Veins contain gold, stibnite, realgar, pyrite and minor to trace chalcopyrite. A few veins in granodiorite contain masses of stibnite more than 1 m long and as much as 12 cm wide.
Comment (Reference): Primary Reference = MacKevett and Smith, 1968
Comment (Deposit): Model Name = Lode: vein, shear zone.
Comment (Commodity): Ore Material = Gold (native)
References
Reference (Deposit): Berg, H.C., and Cobb, E.H., 1967, Metalliferous Lode Deposits of Alaska. U.S. Geological Survey Bulletin 1246, 254 p.
Reference (Deposit): MacKevett, E.M., Jr., and Smith, J.G., 1968, Distribution of gold, copper, and some other metals in the McCarthy B-4 and B-5 quadrangles, Alaska: U.S. Geological Survey Circular 604, 25 p.
Reference (Deposit): MacKevett, E.M., Jr., 1974, Geologic map of the McCarthy B-5 quadrangle, Alaska: U.S. Geological Survey Geologic Quadrangle Map GQ-1146, scale 1:63,360.
Reference (Deposit): MacKevett, E.M., Jr., 1976, Mineral deposits and occurrences in the McCarthy quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-773-B, scale 1:250,000.
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