Greenpoint

The Greenpoint is a silver, copper, molybdenum, and lead 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: Greenpoint

Commodity

Primary: Silver
Primary: Copper
Primary: Molybdenum
Primary: Lead

Location

State: Alaska
District: Hyder

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

Model Name: Polymetallic veins

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Molybdenite
Ore: Pyrite
Ore: Chalcopyrite
Ore: Galena
Gangue: Calcite
Gangue: Quartz

Comments

Comment (Workings): Workings / Exploration = Explored, probably in 1920's, by a small pit and open cut.? Chip samples of veinlets collected in 1972 by the U. S. Bureau of Mines averaged 2.4 ppm Ag, 400 ppm Pb, and 65 ppm Mo. One sample contained 30 ppm Ag, and one assayed 1100 ppm Zn.

Comment (Exploration): Status = Inactive

Comment (Geology): Geologic Description = The country rocks in the area of the Greenpoint prospect are pelitic metasedimentary and andesitic metavolcanic rocks of the Jurassic or older Mesozoic Hazelton Group, and quartz monzonite and granodiorite of the Eocene Hyder Quartz Monzonite (Berg and others, 1977, p. 15-17, 22-23; Smith, 1977; Koch, 1996). ? the deposit (Berg and others, 1977, p. 93-96) consists of numerous quartz-calcite fissure veinlets up to 6 inches thick in multiple fracture sets that cut pelitic hornfels of the Hazelton Group. The veinlets contain up to 5% pyrite, lesser amounts of galena and molybdenite, and traces of chalcopyrite. Chip samples of the veinlets collected in 1972 by U.S. Bureau of Mines investigators contained as much as 30 ppm Ag. Average metal content was 2.4 ppm Ag, 400 ppm Pb, and 65 ppm Mo. One sample assayed 1100 ppm Zn.

Comment (Deposit): Model Name = Polymetallic veins

Comment (Deposit): Other Comments = the Greenpoint claims staked in 1970 (Berg and others, 1977, p. 94) extend beyond the Greenpoint prospect described in this record and cover the old Heckla prospect, which is described separately (BC024).? Site is in Misty Fiords National Monument.

Comment (Reference): Primary Reference = Berg and others, 1977

References

Reference (Deposit): Smith, J.G., 1977, Geology of the Ketchikan D-1 and Bradfield Canal A-1 quadrangles, Alaska: U.S. Geological Survey Bulletin 1425, 49 p.

Reference (Deposit): Elliott, R.L., and Koch, R.D., 1981, Mines, prospects, and selected metalliferous mineral occurrences in the Bradfield Canal quadrangle, Alaska: U.S. Geological Survey Open-File Report 81-728-B, 23 p., 1 sheet, scales 1:250,000 and 1:63,360.

Reference (Deposit): Koch, R.D., 1996, Reconnaissance geologic map of the Bradfield Canal quadrangle, southeastern Alaska: U.S. Geological Survey Open-File Report 81-728-A, 35 p., 1 sheet, scale 1:250,000.

Reference (Deposit): Berg, H.C., Elliott, R.L., Smith, J.G., Pittman, T.L., and Kimball, A. L., 1977, Mineral resources of the Granite Fiords wilderness study area, Alaska, with a section on aeromagnetic data by Andrew Griscom: U.S. Geological Survey Bulletin 1403, 151 p.

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