1. Mineral Resources
  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

Unnamed (north of upper Crumb Gulch)

Prospect in Alaska, United States with commodities Gold, Antimony, Copper
Map
XML
JSON
KML
B
Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Host and associated rocks
  8. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Mining district
  11. Links to other databases
  12. Bibliographic references
  13. General comments
  14. Reporter information

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.

Site location context

Political divisions (FIPS codes)

Valdez-Cordova(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

McCarthy B-5(quadrangle 1:63,360 scale)

McCarthy SW(quadrangle 1:100,000 scale)

McCarthy C(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Chitina River(hydrologic unit)

Copper River(hydrologic accounting unit)

South Central Alaska(hydrologic subregion)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Antimony Critical 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
ListMap

Economic information

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 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

Bibliographic references

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

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.