Marietta

Past Producer in Alaska, United States with commodities Silver, Gold, Copper, Lead, Zinc

Geologic information

Identification information

Deposit ID 10000158
MRDS ID A010193
Record type Site
Current site name Marietta
Alternate or previous names Pecos, Solo Pecos
Related records 10282588

Geographic coordinates

Geographic coordinates: -130.25982, 56.07588 (WGS84)
Relative position The Marietta mine is in Section 9 at an elevation of about 4600 feet, near the lower edge of an icefield overlooking Chickamin Glacier, and about 1.6 mile north of Texas Lake (Berg and others, 1977, p. 76; Elliott and Koch, 1981, p. 11, loc. 26).?
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Gold Primary
Copper Secondary
Lead Secondary
Zinc Secondary

Materials information

Materials Type of material
Electrum Ore
Galena Ore
Gold Ore
Calcite Gangue
Quartz Gangue

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Nearby scientific data

(1) -130.25982, 56.07588

Comments on the geologic information

  • 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.
  • 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.

Economic information

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Hyder

Comments on the production information

  • Production Notes = Unconfirmed report of production of 300-400 oz of gold and electrum in 1937.

Comments on the workings information

  • 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).?

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A010193
USGS Alaska Resource Data File ARDF BC026

Bibliographic references

  • 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.

  • 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.

  • 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.

  • 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.

  • 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.

Comments on the references

  • Primary Reference = Berg and others, 1977

General comments

Subject category Comment text
Deposit Model Name = Polymetallic veins
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.?

Reporter information

Type Date Name Affiliation Comment
Reporter 17-MAY-1998 H. C. Berg U.S. Geological Survey