Marietta

The Marietta is a gold and silver 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

Satelite View

MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.

Site Name

Primary: Marietta
Secondary: Pecos
Secondary: Solo Pecos

Commodity

Primary: Gold
Primary: Silver
Secondary: Zinc
Secondary: Copper
Secondary: 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: Past Producer
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: Electrum
Ore: Galena
Ore: Gold
Gangue: Calcite
Gangue: Quartz

Comments

Comment (Exploration): Status = Inactive

Comment (Geology): Age = Lead-isotope studies of galena from the Pecos and Solo Pecos claims in the area of the Marietta mine (Maas and others, 1995, p. 229-248) indicate that the deposits on those claims are Eocene in age, contemporaneous with emplacement of the Hyder Quartz Monzonite.

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

Comment (Geology): Geologic Description = The country rocks in the area of the Marietta mine are pelitic metasedimentary strata of the Jurassic or older Mesozoic Hazelton Group. The Hazelton is underlain and locally intruded by the Triassic Texas Creek Granodiorite, and both the Hazelton and Texas Creek rocks are intruded by the Eocene Hyder Quartz Monzonite (Berg and others, 1977, p. 15-18, 22-23; Smith, 1977; Koch, 1996).? There is no published geologic description of this deposit, which is covered by ice. The discovery around 1925 of electrum-bearing float nearby led to tunneling beneath the ice that resulted in the discovery in 1937 of a vein under the glacier (Berg and others, 1977, p. 76-77; Elliott and Koch, 1981), followed by unconfirmed reports of production of 300-400 oz of gold and electrum. A search by the U.S. Bureau of Mines in 1972-73 (Berg and others, 1977, p. 76-77) failed to find bedrock workings due to snow and ice cover. Analyses by the Bureau of Mines of sparse galena-, pyrrhotite-, and chalcopyrite-bearing quartz-calcite veinlets in graywacke and argillite near the reported mine site showed small amounts of Cu, Pb, Zn, and Ag, but virtually no gold.? Lead-isotope studies of galena from the Pecos and Solo Pecos claims in the area of the Marietta mine (Maas and others, 1995, p. 229-248) indicate that the deposits on those claims are Eocene in age, contemporaneous with emplacement of the Hyder Quartz Monzonite.

Comment (Production): Production Notes = Unconfirmed report of production of 300-400 oz of gold and electrum in 1937.

Comment (Workings): Workings / Exploration = Almost 6000 feet of ice tunnels were driven to find the source of gold-and electrum-bearing float found on the mountainside below the mine.? Analyses in 1972-73 by the U. S. Bureau of Mines of sparse galena-, pyrrhotite-, and chalcopyrite-bearing quartz-calcite veinlets in graywacke and argillite near the reported mine site showed small amounts of Cu, Pb, Zn, and Ag, but virtually no gold. ? Operators of the nearby Pecos and Solo Pecos claims (Maas and others, 1995, p. 238, 241, 243) explored those deposits by mapping, sampling, ground geophysical work, and limited diamond drilling, but the ground was abandoned at the time of the U. S. Bureau of Mines investigation in 1973 (Berg and others, 1977, p. 76-77).?

Comment (Deposit): Model Name = Polymetallic veins

Comment (Deposit): Other Comments = Six claims staked in 1925. Original claims lapsed in 1950 and ground was restaked several times since then. In 1973, the nearby Pecos and Solo Pecos claims were abandoned after limited exploration work.? Some reports link the Marietta and Silver King (BC028) claims, but the latter are at a lower elevation and possibly farther south (Berg and others, 1977, p. 39).? Site is in Misty Fiords National Monument.?

References

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): 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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