The Engineer is a silver, copper, gold, 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: Silver, Copper, Gold, Lead
Lat, Long: 56.044, -130.21800
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Engineer MRDS details
Site Name
Primary: Engineer
Commodity
Primary: Silver
Primary: Copper
Primary: Gold
Primary: Lead
Secondary: Tungsten
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
Ore: Scheelite
Gangue: Quartz
Comments
Comment (Geology): Age = Lead-isotope studies of galena from the Engineer prospect (Maas and others, 1995, p. 229-248) indicate that the deposit is Eocene in age, contemporaneous with emplacement of the Hyder Quartz Monzonite.
Comment (Exploration): Status = Inactive
Comment (Workings): Workings / Exploration = Prospect was explored, probably in the 1920's, by a 30-foot adit and several opencuts. Early assays of seven specimens from sulfide-rich masses showed 0.04-0.64 oz Au and 7.6-26 oz Ag per ton, and 11.3-55.3% Pb.
Comment (Deposit): Model Name = Polymetallic veins
Comment (Geology): Geologic Description = The country rocks in the area of the Engineer prospect are pelitic metasedimentary and subordinate andesitic metavolcanic strata of the Jurassic or older Mesozoic Hazelton Group, which is 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; Koch, 1996). The deposit (Buddington, 1929, p. 109-110) consists of a quartz fissure vein 1-4.5 feet (generally 2-4 feet) thick hosted by Texas Creek Granodiorite near its contact with Hazelton argillite and graywacke. The vein locally contains masses of chalcopyrite, pyrite, and galena, and rare grains of scheelite. Assays of seven specimens from the sulfide-rich masses showed 0.04-0.64 oz Au and 7.6-26 oz Ag per ton, and 11.3-55.3% Pb. Lead-isotope studies of galena from the Engineer prospect (Maas and others, 1995, p. 229-248) indicate that the deposit is Eocene in age, contemporaneous with emplacement of the Hyder Quartz Monzonite.
Comment (Reference): Primary Reference = Buddington, 1929
References
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., 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): 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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