Lone Mountain

Occurrence in Alaska, United States with commodities Copper, Silver, Gold, Tungsten

Geologic information

Identification information

Deposit ID 10021688
MRDS ID DE00940
Record type Site
Current site name Lone Mountain

Geographic coordinates

Geographic coordinates: -160.23269, 59.35929 (WGS84)
Relative position Lone Mountain is an upland between Gechiak Creek and another (unnamed) west tributary to the Togiak River. This occurrence is assumed to be on the east side of Lone Mountain, in the larger drainage that flows east to Togiak River. For this record, the map site is at an elevation of 1,300 feet on the north flank of Lone Mountain, in the SE1/4 of section 28, T 9 S, R 65 W, of the Seward Meridian. This occurrence is area 2 of Kilburn and others (1992). It is approximately located, perhaps within a mile.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Silver Secondary
Gold Secondary
Tungsten Secondary

Comments on the commodity information

  • Gangue = Carbonate

Materials information

Materials Type of material
Pyrite Ore
Quartz Gangue

Alteration

  • (Local) Silicification and oxidation.

Mineral occurrence model information

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

Host and associated rocks

  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic)
    Rock unit name Togiak Terrane
    Rock description Togiak Terrane
  • Host or associated Host
    Rock type Plutonic Rock > Granitoid > Granite

Nearby scientific data

(1) -160.23269, 59.35929

Comments on the geologic information

  • Geologic Description = Lone Mountain is centered on a Cretaceous or Tertiary felsic stock surrounded by hornfels (Hoare and Coonrad, 1978). The iron-stained hornfels, which is locally gossan, contains disseminated pyrite and small quartz-pyrite veinlets. Quartz veinlets are also locally present in iron-stained parts of the stock near the contact zone. Stream-sediment samples from the area contain anomalous amounts of As, Bi, Cu, Pb, Mo, W, or Zn (Cieutat and others, 1988; Hessin and others, 1978 [OF 78-9-Q; OF 78-9-M]). Hornfels and veinlet samples collected near the eastern contact mostly contain anomalous amounts of copper (up to 900 ppm Cu) and up to 1.2 ppm Ag, 0.01 ppm Au, 26 ppm Bi, 7.2 ppm Mo, 30 ppm Sn, and 50 ppm W (Kilburn and others, 1992). One iron-stained, carbonate-cemented breccia contained 460 ppm As, 0.15 ppm Au, 1.9 ppm Hg, and 11 ppm Sb.
  • Age = Probably Late Cretaceous or Early Tertiary. Mineralization is probably related to the granitic pluton in the area, which is part of a regionally extensive Upper Cretaceous and Lower Tertiary plutonic suite (Hoare and Coonrad, 1978).

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Bristol Bay Region

Comments on the workings information

  • Workings / Exploration = Reconnaissance geochemical sampling has been completed in the area (Cieutat and others, 1988; Hessin and others, 1978 [OF 78-9-Q; OF 78-9-M]).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS DE00940
USGS Alaska Resource Data File ARDF GO013

Bibliographic references

  • Deposit

    Hoare, J.M., and Coonrad, W.L., 1978, Geologic map of the Goodnews and Hagemeister Island quadrangles region, southwestern Alaska: U.S. Geological Survey Open-File Report 78-9-B, two sheets, scale 1:250,000.

  • Deposit

    Hessin, T.D., Taufen, P.M., Seward, J.C., Quintana, S.J., Clark, A.L., Grybeck, Donald, Hoare, J.M., and Coonrad, W.L., 1978, Geochemical and generalized geological map showing distribution and abundance of molybdenum, tin, and tungsten in the Goodnews and Hagemeister quadrangles region, southwestern Alaska: U.S. Geological Survey Open-File Report 78-9-Q, scale 1:250,000.

  • Deposit

    Hessin, T.D., Taufen, P.M., Seward, J.C., Quintana, S.J., Clark, A.L., Grybeck, Donald, Hoare, J.M., and Coonrad, W.L., 1978, Geochemical and generalized geological map showing distribution and abundance of copper in the Goodnews and Hagemeister quadrangles region, southwestern Alaska: U.S. Geological Survey Open-File Report 78-9-M, scale 1:250,000.

  • Deposit

    Cieutat, B.A., Goldfarb, R.J., and Specman, W.S., 1988, Analytical results and sample locality map of stream-sediment, heavy-mineral-concentrate, and organic material samples from the Goodnews, Hagemeister Island, and Nushagak quadrangles, southwest Alaska: U.S. Geological Survey Open-File Report 88-591, 187 p.

  • Deposit

    Kilburn, J., Box, S.E., Goldfarb, R.J., and Gray, J.E., 1992, Geochemically anomalous areas in the eastern Goodnews Bay quadrangle, southwest Alaska, in Bradley, D. C., and Ford, A. B., eds., The U.S. Geological Survey in Alaska, Accomplishments in 1990: U. S. Geological Survey Bulletin 1999, p. 156-162.

Comments on the references

  • Primary Reference = Kilburn and others, 1992

General comments

Subject category Comment text
Deposit Model Name = Polymetallic veins (Cox and Singer, 1986; model 22c)

Reporter information

Type Date Name Affiliation Comment
Reporter 20-MAR-2001 Travis L. Hudson Applied Geology