The Portland is a copper, lead, and zinc 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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Portland MRDS details
Site Name
Primary: Portland
Commodity
Primary: Copper
Primary: Lead
Primary: 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: 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: Chalcopyrite
Ore: Galena
Ore: Pyrite
Gangue: Quartz
Comments
Comment (Reference): Primary Reference = Buddington, 1929
Comment (Deposit): Model Name = Polymetallic veins
Comment (Exploration): Status = Inactive
Comment (Workings): Workings / Exploration = Quartz vein in slate was explored by pits and a 15-foot adit, probably in the 1920's.
Comment (Deposit): Other Comments = the Portland group was originally staked in 1919.? Buddington's (1929, p. 84) description of the Portland group ambiguously includes information about the adjoining Hobo group, which he also describes separately (p. 84-85). This record (BC070) summarizes Buddington's ambiguous description of the Portland(-Hobo) group, whereas BC071 summarizes Buddington's separate description of the Hobo group.
Comment (Geology): Geologic Description = The country rocks in the area of the Portland prospect are the Triassic Texas Creek Granodiorite, which underlies and locally intrudes pelitic metasedimentary and subordinate andesitic (greenstone) metavolcanic strata of the Jurassic or older Mesozoic Hazelton Group; the Eocene Boundary Granodiorite, which intrudes the Hazelton and Texas Creek rocks; and still-younger Tertiary lamprophyre dikes, which cut all the other rocks (Smith, 1973, 1977; Koch, 1996).? Buddington's (1929, p. 84) description of the Portland group ambiguously includes information about the Hobo group, which he also describes separately (p. 84-85). (See Additional Comments field, below). The deposit is in greenstone and slate cut by a dike of granodiorite porphyry. On the Portland group, Buddington describes only a quartz vein along the slate-dike contact that contains many inclusions of the country rocks and which was exposed in an open cut. On the Hobo group, he describes a 2-3 foot quartz vein in the dike, and a 2-foot quartz vein in slate that was explored by a 15-foot adit and traced for 1500 feet by pits and surface exposures. The slate-hosted vein contains sparsely disseminated pyrite, galena, and sphalerite, and a little chalcopyrite. The slate also contains other quartz veins and stringers.
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): Buddington, A.F., 1929, Geology of Hyder and vicinity, southeastern Alaska, with a reconnaissance of Chickamin River: U.S. Geological Survey Bulletin 807, 124 p.
Reference (Deposit): Smith, J.G., 1973, A Tertiary lamprophyre dike province in southeastern Alaska: Canadian Journal of Earth Sciences, v. 10, p. 408-420.
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