Clough

The Clough is a silver, zinc, lead, and copper mine located in Alaska.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

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Site Name

Primary: Clough

Commodity

Primary: Silver
Primary: Zinc
Primary: Lead
Primary: Copper
Secondary: Cobalt

Location

State: Alaska
District: McGrath

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Model Name: Skarn Zn-Pb

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: None.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Sphalerite
Ore: Pyrite
Ore: Chalcopyrite
Gangue: Quartz
Gangue: Epidote

Comments

Comment (Reference): Primary Reference = Bundtzen, Harris, and Gilbert, 1997

Comment (Workings): 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.

Comment (Deposit): Model Name = Low temperature lead-zinc skarn (Cox and Singer, 1986; model 18c).

Comment (Deposit): Other Comments = Similar to Rat Fork-Headwall (MG059) and Rat Fork-Base (MG058) prospects.

Comment (Geology): 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).

Comment (Exploration): Status = Inactive

References

Reference (Deposit): Bundtzen, T.K., Harris, E.E., and Gilbert, W.G., 1997, Geologic Map of the eastern McGrath quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 97-14, 34 pages, one sheet, scale 1:125,000.

Reference (Deposit): Bundtzen, T.K., Kline, J.T., and Clough, J.G., 1982, Preliminary geologic map of the McGrath B-2 quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Open-File report 149, 22 pages, one sheet, scale 1:63,360.

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