Silver Coin

The Silver Coin is a lead and 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: Silver Coin

Commodity

Primary: Lead
Primary: Copper

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: Minor oxidation of chalcopyrite to malachite.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Chalcopyrite
Ore: Galena
Ore: Malachite
Ore: Pyrite
Gangue: Quartz

Comments

Comment (Geology): Age = Lead-isotope studies of galena from the Silver Coin 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 (Exploration): Status = Inactive

Comment (Deposit): Model Name = Polymetallic vein

Comment (Deposit): Other Comments = Site probably originally staked in 1923

Comment (Geology): Geologic Description = The country rock in the area of the Silver Coin occurrence is Triassic Texas Creek Granodiorite, which regionally underlies and locally intrudes pelitic metasedimentary and subordinate andesitic metavolcanic strata of the Jurassic or older Mesozoic Hazelton Group; and the Eocene Hyder Quartz Monzonite, which intrudes the Hazelton and Texas Creek rocks (Smith, 1977; Koch, 1996).? Buddington (1925, p. 90; 1929, p. 95) describes the deposit as a quartz fissure vein up to about 10 feet thick and 50 feet long in a shear zone in granodiorite. The northern 25 feet of the vein contains a shoot as much as 5 feet thick of massive galena, accompanied by a little pyrite and chalcopyrite. The remainder of the vein is barren. A little malachite occurs on shear surfaces in the granodiorite footwall of the ore shoot.? Lead-isotope studies of galena from the Silver Coin 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 (Reference): Primary Reference = Buddington, 1929

References

Reference (Deposit): Buddington, A.F., 1925, Mineral investigations in southeastern Alasaka: U.S. Geological Survey Bulletin 773, p. 71-139.

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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