The Swennings Greenpoint is a molybdenum, silver, 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
Elevation:
Commodity: Molybdenum, Silver, Lead
Lat, Long: 56.015, -130.26389
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Swennings Greenpoint MRDS details
Site Name
Primary: Swennings Greenpoint
Commodity
Primary: Molybdenum
Primary: Silver
Primary: Lead
Secondary: Copper
Secondary: Zinc
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: Occurrence
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
Alteration Type: L
Alteration Text: Local intense iron staining of quartz veins
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Galena
Ore: Molybdenite
Gangue: Quartz
Comments
Comment (Geology): Age = Lead-isotope studies of galena from the Swennings Greenpoint occurrence (Maas and others, 1995, p. 229-248) indicate that the deposit is Eocene in age, contemporaneous with emplacement of the Hyder Quartz Monzonite.
Comment (Deposit): Model Name = Polymetallic veins
Comment (Deposit): Other Comments = Claims were inactive in 1973.?Site is in Misty Fiords National Monument.
Comment (Exploration): Status = Inactive
Comment (Reference): Primary Reference = Berg and others, 1977
Comment (Workings): Workings / Exploration = Assays of samples collected in 1972 by the U.S. Bureau of Mines (Berg and others, 1977) showed as much as 100 ppm Ag, 350 ppm Cu, 4.5% Pb, 1000 ppm Zn, and 2000 ppm Mo.
Comment (Geology): Geologic Description = The country rocks in the area of this occurrence are pelitic metasedimentary strata of the Jurassic or older Mesozoic Hazelton Group, which are underlain and locally intruded by the Triassic Texas Creek Granodiorite; and the Eocene Hyder Quartz Monzonite, which intrudes the Hazelton and Texas Creek rocks (Smith, 1977; Berg and others, 1977, p. 15-17, 22-23; Koch, 1996).? the deposit consists of quartz veins in Hazelton hornfels about 50 feet from the contact of a dike of Hyder Quartz Monzonite (Berg and others, 1977, p. 92-93). The veins, which strike N30W and dip 65-70NE, are iron stained and contain scattered knots of galena and molybdenite. Assays of samples collected in 1972 by the U.S. Bureau of Mines showed as much as 100 ppm Ag, 350 ppm Cu, 4.5% Pb, 1000 ppm Zn, and 2000 ppm Mo.? Lead-isotope studies of galena from the Swennings Greenpoint occurrence (Maas and others, 1995, p. 229-248) indicate that the deposit is Eocene in age, contemporaneous with emplacement of the Hyder Quartz Monzonite.
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): 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.
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): Maas, K.M., Bittenbender, P E., and Still, J.C., 1995, Mineral investigations in the Ketchikan mining district, southeastern Alaska: U.S. Bureau of Mines Open-File Report 11-95, 606 p.
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.
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