Greathouse

The Greathouse is a 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: Greathouse

Commodity

Primary: Copper

Location

State: Alaska
District: Valdez Creek

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

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

Physiography

Not available

Mineral Deposit Model

Not available

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: The country rock has been epidotized adjacent to and along the shear zone.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Bornite
Ore: Chalcocite
Ore: Covellite
Ore: Malachite
Gangue: Calcite
Gangue: Epidote
Gangue: Quartz

Comments

Comment (Geology): Age = Triassic or younger.

Comment (Reference): Primary Reference = Kaufman, 1964 (ADGGS GR 4)

Comment (Workings): Workings / Exploration = No surface workings; chip samples across a 3-foot-wide section of the shear zone contained as much as 11% Cu (Kaufman, 1964).

Comment (Geology): Geologic Description = The bedrock in the area of this prospect is the Triassic Nikolai Greenstone, a thick sequence of subaerial and submarine basalt flows, and minor interbedded volcaniclastic rocks, argillite, and radiolarian chert (Nokleberg and others, 1992).? the deposit consists of bornite, chalcocite, covellite, and malachite in a 3-foot-wide, northwest-trending shear zone. A chip sample across the zone contained 11% copper. The mineralized portion of the shear zone is less than 100 feet long, but the zone can be traced for more than 1,000 feet. Both the hanging wall and the footwall are altered basalt, and the brecciated country rock in the shear zone is strongly epidotized. A 4-foot-wide diorite dike cuts the basalt near the shear zone (Smith, 1981). Glavinovich (1967) noted that chalcocite replaces bornite, covellite replaces chalcocite, and quartz and malachite crosscut the sulfides. Several other northwest-trending shear zones occur in the area but are not known to contain any copper minerals. This prospect is in a broad belt of small copper occurences that extends east-northeast for approximately 10 miles along the south side of Windy Creek.

Comment (Deposit): Model Name = Mineralized shear zone.

Comment (Exploration): Status = Inactive

References

Reference (Deposit): Nokleberg, W.J., and others, 1992, Circum-North Pacific terrane map, in Tracy, K.V., Anker, E. M., Ryan, C., Hoffman, V. , eds., International conference on Arctic margins, p. 44.

Reference (Deposit): Smith, T.E., 1981, Geology of the Clearwater Mountains, south-central Alaska: Alaska Division of Geological "&" Geophysical Surveys Geologic Report 60, 72 p., 3 sheets, scale 1:63,360.

Reference (Deposit): Kaufman, M.A., 1964, Geology and mineral deposits of the Denali-Maclaren River area, Alaska: Alaska Division of Mines and Minerals, Geologic Report 4, 15 p., 1 sheet, scale 1:105,000.

Reference (Deposit): Glavinovich, P.S., 1967, Trace element copper distribution and areal geology in a portion of the Clearwater Mountains, Alaska: University of Alaska Minerals Industry Research Laboratory, Report 10, 55 p.

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