Crumb Gulch

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

Satelite View

MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.

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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