Unnamed (Russell Island)

Occurrence in Alaska, United States with commodities Gold, Silver, Lead, Tungsten, Zinc

Geologic information

Identification information

Deposit ID 10002258
MRDS ID A013161
Record type Site
Current site name Unnamed (Russell Island)
Related records 10112579

Geographic coordinates

Geographic coordinates: -136.81518, 58.94111 (WGS84)
Relative position This site is a small bight on the northeast tip of Russell Island (Kimball and others (1978, figs. C45 and C55). The location is accurate within 0.10 mile. Another vein cropped out 1000 feet west-northwest of located vein. The locality is number 29 of Cobb (1972).
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Geographic areas

Country State
United States Alaska

Commodities

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

Comments on the commodity information

  • Ore Material = Gold (native)

Materials information

Materials Type of material
Galena Ore
Pyrite Ore
Pyrrhotite Ore
Scheelite Ore
Sphalerite Ore
Gold Ore
Ankerite Gangue
Calcite Gangue
Dolomite Gangue
Quartz Gangue
Sericite Gangue

Alteration

  • (Local) Granodiorite has been altered; alteration products include chlorite, sericite, introduced quartz, and probably ankerite or dolomite.

Mineral occurrence model information

Model code 273
USGS model code 36a
Deposit model name Low-sulfide Au-quartz vein
Mark3 model number 27

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Stratigraphic age (youngest) Late Cretaceous
  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite

Nearby scientific data

(1) -136.81518, 58.94111

Comments on the geologic information

  • Geologic Description = Russell Island is underlain mainly by granodiorite of Cretaceous age (Brew and others, 1978). On the northeastern part of the island, quartz veins as much as about 0.5 feet wide occur in ankeritic (iron-stained) zones as much as 4 feet thick that cut the granodiorite. The main vein occurrence has an estimated length of 280 feet on the island. It strikes N. 15 degrees E. and is nearly vertical. It extends across the small peninsula between shorelines of Glacier Bay at the northeast tip of Russell Island (Kimball and others, 1978, fig. C55). The quartz veins within the ankerite shear zone contain ankerite, pyrite, pyrrhotite, sericite, dolomite, calcite, and traces of scheelite. The pyrite contains native gold particles visible microscopically. Two additional, narrow iron-stained vein zones are 1,000 feet west-northwest of the main vein zone. The Russell Island occurrences appear to represent the approximate northeast limit of the Reid Inlet gold area.? Channel samples of selected veins contained more than 5 ounces per ton gold, and a weighted sample reduced to a 4-foot mining width contained 0.35 ounce per ton gold.
  • Age = Late Cretaceous or younger.

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Juneau

Comments on the workings information

  • Workings / Exploration = Surface exposures only. Channel samples of selected quartz veins contain as much as 5.81 ounces per ton gold, 2.64 ounces per ton silver, 890 ppm lead, 550 ppm zinc, and less than 50 ppm tungsten. (Five of fifteen samples from the veins show a trace of tungsten as does one of two samples from the vein occurrence 1000 feet to the west-northwest.) Weighted values for 4-foot mining widths range from 0.02 to 0.35 ounce per ton gold and from 0.02 to 0.17 ounce per ton silver (Kimball and others, 1978, p. C238-241). ? the occurrence may have been discovered by the U.S. Geological Survey in 1966; MacKevett and others (1966) reported a narrow quartz vein at the site contained 0.844 ounces of gold per ton.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A013161
USGS Alaska Resource Data File ARDF MF034

Bibliographic references

  • Deposit

    MacKevett, E.M., Jr., Brew, D.A., Hawley, C.C., Huff, L.C., and Smith, J.G., 1971, Mineral resources of Glacier Bay National Monument, Alaska: U.S. Geological Survey Professional Paper 632, 90 p., 12 plates, scale 1:250,000.

  • Deposit

    Brew, D.A., Johnson, B.R., Grybeck, D., Griscom, A., Barnes, D.F., Kimball, A.L., Still, J.C., and Rataj, J.L., 1978, Mineral resources of the Glacier Bay National Monument Wilderness Study Area, Alaska: U.S. Geological Survey Open-File Report 78-494, 670 p.

  • Deposit

    Kimball, A.L., Still, J.C., and Rataj, J.L., 1978, Mineral resources, in Brew, D. A., and others, Mineral resources of the Glacier Bay National Monument wilderness study area, Alaska: U.S. Geological Survey Open-File Report 78-494, p. C1-C375.

  • Deposit

    Cobb, E.H., 1972, Metallic mineral resources map of the Mount Fairweather quadrangle, AK: U.S. Geological Survey Miscellaneous Field Study Map MF-436, 1 sheet, scale 1:250,000.

Comments on the references

  • Primary Reference = Kimball and others, 1978

General comments

Subject category Comment text
Deposit Model Name = Low-sulfide gold-quartz vein (Cox and Singer, 1986; model 36a).
Deposit Other Comments = Area warrants further exploration; it is within Glacier Bay National Park and Preserve.

Reporter information

Type Date Name Affiliation Comment
Reporter 08-APR-99 Hawley, C.C. Hawley Resource Group