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  3. Mineral Resource Data System (MRDS)

Clough

Occurrence in Alaska, United States with commodities Silver, Copper, Lead, Zinc, Cobalt
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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. Alteration
  8. Mineral occurrence model information
  9. Nearby scientific data
  10. Economic information about the deposit and operations
  11. Mining district
  12. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10307861
Record type Site
Current site name Clough

Geographic coordinates

Geographic coordinates: -153.77184, 62.32548 (WGS84)
Relative position The Clough occurrence is in a saddle that separates two northwest-trending ridgelines about 2.0 kilometers west of the north end of Smith Lake at an elevation of 4,500 feet (1,372 m) in the SW1/4 sec. 20, T. 26 N., R. 24 W., of the Seward Meridian. The reporter visited the site with Jim Clough in 1981. Note that the occurrence as shown in Bundtzen, Harris, and Gilbert (1997; map no. 10) is mislocated.

Site location context

Political divisions (FIPS codes)

Yukon-Koyukuk(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

McGrath B-2(quadrangle 1:63,360 scale)

McGrath SE(quadrangle 1:100,000 scale)

McGrath(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Kuskokwim River(hydrologic accounting unit)

Southwest(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Cook Inlet Region, Incorporated(ANCSA Region)

ANCSA Region NTVPIC(Type of land area)

NTVPIC(Federal land areas administered by NTVPIC)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Copper Primary
Lead Primary
Zinc Critical Primary
Cobalt Critical Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Pyrite Ore
Sphalerite Ore
Epidote Gangue
Quartz Gangue

Alteration

  • (Local) None.

Mineral occurrence model information

Model code 60
USGS model code 18c
Deposit model name Skarn Zn-Pb
Mark3 model number 22

Nearby scientific data

(1) -153.77184, 62.32548
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The Clough occurrence is a small but rich massive sulfide skarn zone adjacent to an altered, east-west-trending felsic (?) dike. The host rock for the skarn is argillaceous limestone of the mid-Silurian Terra Cotta Mountains Sandstone, a unit of the Dillinger subterrane (Bundtzen, Harris, and Gilbert, 1997). Principle sulfide minerals include massive pyrite and sphalerite veins up to 8 centimeters thick, and a trace of chalcopyrite in an epidote-quartz skarn. One grab sample of high grade mineralization contained 13.0 percent zinc, 0.11 percent lead, 0.50 percent copper, 26 grams/tonne silver, and 300 ppm cobalt. (Bundtzen, Kline, and Clough, 1982; Bundtzen, Harris, and Gilbert, 1997).

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Inactive

Mining district

District name McGrath

Comments on the workings information

  • Workings / Exploration = The Clough occurrence was found by Jim Clough of Alaska Division of Geological and Geophysical Surveys during a geologic mapping program in 1981 (Bundtzen, Kline, and Clough, 1982). One grab sample of high grade mineralization contained 13.0 percent zinc, 0.11 percent lead, 0.50 percent copper, 26 grams/tonne silver, and 300 ppm cobalt.

Reference information

Comments on the references

  • Primary Reference = Bundtzen, Harris, and Gilbert, 1997

General comments

Subject category Comment text
Deposit Model Name = Low temperature lead-zinc skarn (Cox and Singer, 1986; model 18c).
Deposit Other Comments = Similar to Rat Fork-Headwall (MG059) and Rat Fork-Base (MG058) prospects.

Reporter information

Type Date Name Affiliation Comment
Reporter 07-DEC-98 T.K. Bundtzen Pacific Rim Geological Consulting

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.