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Colbert

Prospect in Alaska, United States with commodity Tungsten
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Mineral occurrence model information
  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 10308843
MRDS ID A015302
Record type Site
Current site name Colbert
Alternate or previous names Big Chief, Pearl, Triangle
Related records 10002830, 10232891

Geographic coordinates

Geographic coordinates: -147.36395, 64.98068 (WGS84)
Relative position The Colbert prospect is located in the SW1/4SW1/4 sec. 21, T. 2 N., R. 2 E., Fairbanks Meridian. The Colbert deposit is located at the top of Gilmore Dome. The prospect is included in locality 32 of Cobb (1972 [MF 410]).

Site location context

Political divisions (FIPS codes)

Fairbanks North Star(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Fairbanks D-1(quadrangle 1:63,360 scale)

Big Delta NW(quadrangle 1:100,000 scale)

Fairbanks(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Tungsten Critical Primary

Materials information

Materials Type of material
Scheelite Ore

Mineral occurrence model information

Model code 42
USGS model code 14a
Deposit model name W skarn

Nearby scientific data

(1) -147.36395, 64.98068
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The Colbert tungsten deposit consists of scheelite in and parallel to metasedimentary rocks that are intruded by porphyritic granite (Thorne and others, 1948, p. 4). Small amounts of scheelite are also disseminated in the granite. The ore lenses occupy parts of a 30-foot-thick calcareous bed in schist. The lode has been traced for approximately 2,000 feet; it varies in thickness. The mineralization pinches out in some places, but a zone as much as 50 feet wide was observed in one trench (Byers, 1957). The tungsten content of the ore shoots is 1.3 percent tungsten tri-oxide over an average width of 1.6 feet (Byers, 1957). This tungsten deposit is 1,000 feet south of and parallel to the Stepovich lode (FB113) (Berg and Cobb, 1967, p. 220).

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Fairbanks

Comments on the workings information

  • Workings / Exploration = This prospect has been explored by trenches (Byers, 1957).

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Byers, 1957

General comments

Subject category Comment text
Deposit Model Name = W skarn deposit (Cox and Singer, 1986; model 14a)

Reporter information

Type Date Name Affiliation Comment
Reporter 31-JUL-2001 J.R. Guidetti Schaefer and C.J. Freeman Avalon Development Corporation

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.