Unnamed (north of upper Crumb Gulch)

Prospect in Alaska, United States with commodities Gold, Antimony, Copper

Geologic information

Identification information

Deposit ID 10086653
MRDS ID A011698
Record type Site
Current site name Unnamed (north of upper Crumb Gulch)
Alternate or previous names Crumb Gulch
Related records 10258512

Geographic coordinates

Geographic coordinates: -142.52635, 61.35078 (WGS84)
Relative position Several prospects occur within 1/2 mile of location given--all around base of Williams Peak. Best location: MacKevett, 1974. Accurate within radius of 100 feet.
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Geographic areas

Country State
United States Alaska


Commodity Importance
Gold Primary
Antimony Primary
Copper Secondary

Comments on the commodity information

  • Ore Material = Gold (native)

Materials information

Materials Type of material
Chalcopyrite Ore
Realgar Ore
Stibnite Ore
Gold Ore

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Stratigraphic age (youngest) Pliocene
    Stratigraphic age (youngest) Late Cretaceous
  • Host or associated Host
    Rock type Metamorphic Rock > Hornfels

Nearby scientific data

(1) -142.52635, 61.35078

Comments on the geologic information

  • 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.

Economic information

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Nizina

Comments on the workings information

  • 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).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A011698
USGS Alaska Resource Data File ARDF MC072

Bibliographic references

  • Deposit

    Berg, H.C., and Cobb, E.H., 1967, Metalliferous Lode Deposits of Alaska. U.S. Geological Survey Bulletin 1246, 254 p.

  • 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.

  • 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.

  • 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.

Comments on the references

  • Primary Reference = MacKevett and Smith, 1968

General comments

Subject category Comment text
Deposit Model Name = Lode: vein, shear zone.

Reporter information

Type Date Name Affiliation Comment
Reporter 07-NOV-1997 Leonard, K.R. U.S. Geological Survey
Reporter 07-NOV-1997 Elliott, R.L. U.S. Geological Survey
Reporter 07-NOV-1997 Richter, D.H. U.S. Geological Survey