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

Cobol Gold Mine

Past Producer in Alaska, United States with commodities Gold, Lead
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. Ore body information
  10. Controls for ore emplacement
  11. Economic information about the deposit and operations
  12. Mining district
  13. Land status
  14. Workings at the site
  15. Links to other databases
  16. Bibliographic references
  17. General comments
  18. Reporter information

Geologic information

Identification information

Deposit ID 10002371
MRDS ID A013289
Record type Site
Current site name Cobol Gold Mine
Related records 10233694

Geographic coordinates

Geographic coordinates: -135.87007, 57.49332 (WGS84)
Elevation 169
Relative position 0.3 MI N OF COBOL

Site location context

Political divisions (FIPS codes)

Sitka(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Sitka B-6(quadrangle 1:63,360 scale)

Sitka SW(quadrangle 1:100,000 scale)

Sitka(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Central Southeast Alaska(hydrologic accounting unit)

Southeast Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Tongass National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

West Chichagof-Yakobi Wilderness(Wilderness)

Wilderness FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State
United States Alaska

Comments on the location information

  • USGS MF-1476-B, LOC. 21; USGS MF-467, LOC. 44 LAND STATUS VALUE CALCULATED 6-94 USING GIS OVERLAY ANALYSIS WITH BLM 1:2,500,000 SCALE OWNERSHIP STATUS MAP (1991).

Commodities

Commodity Importance
Gold Primary
Lead Tertiary

Materials information

Materials Type of material
Galena Ore
Pyrite Gangue

Analytical data

Result 57 FT. UNDERGROUND ZONE AVERAGE 0.28 OZ/TON AU FOR 3 FT. MINING WIDTH-USGS MF-1476-B, P.

Host and associated rocks

  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Siltstone
    Rock unit name Graywacke;
    Rock description Graywacke;

Nearby scientific data

(1) -135.87007, 57.49332
ListMap

Economic information

Ore body information

  • Strike N 05 DEGREES E (FAULT)
    Dip 90 DEGREES (FAULT)

Controls for ore emplacement

  • Fault Zone

Comments on the geologic information

  • SOME FAULT MOVEMENT WAS LATER THAN DEPOSITION OF ORE MINERALS, AS SHOWN BY PYRITE AND GOLD SMEARED ALONG FAULT SURFACES.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1925
Year of first production 1937

Mining district

District name Chichagof

Land status

Ownership category National Forest

Workings at the site

  • Type of workings Underground
    Length 569.98M

Comments on the workings information

  • LOWER TUNNEL 1,330 FT. LONG, UPPER TUNNEL 50 FT. LONG.

Comments on development

  • 5 CLAIMS ESTABLISHED IN 1928, TWO TUNNELS DRIVEN. PRODUCTION REPORTED IN 1937 (MAY HAVE BEEN SOME EARLIER). CLAIMS STILL ACTIVE AS OF 1982.

Reference information

Bibliographic references

  • Deposit

    USGS MF-1476-B, LOC. 21, P. 6 (1982)

  • Deposit

    USGS B 929, P. 139-140 (1941)

  • Deposit

    USGS OF 78-450, P. 35 (1978)

  • Deposit

    USGS MF-467, LOC. 44 (1972)

  • Deposit

    USBM OFR 20-73, LOC. 9 (1978)

  • Other Database

    BAG-MF-1476-B-21

General comments

Subject category Comment text
Deposit TUNNELS DRIVEN ALONG FAULT ZONE IN GRAYWACKE. LIGHT-COLORED DIKE ROCK SLICED INTO LENSES BY FAULT MOVEMENT. VEIN IN FAULT IS UP TO 1 FT. THICK AND COMPOSED OF GOUGE, MILKY RIBBON QUARTZ, WITH PYRITE, GALENA, GOLD. GOLD ALSO IN FRACTURES IN DIKE.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1987 Leonard, Kenneth R. (Huber, Donald F.) U.S. Geological Survey
Editor 14-SEP-1994 Waller, Nichelle (Mosier, Dan) U.S. Geological Survey PARSED OUT HOST ROCK AND ASSOCIATED ROCK TYPES, AGES, UNIT NAMES, AND UNIT AGES.

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.