Unnamed (near Chitsia Mountain)

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

Geologic information

Identification information

Deposit ID 10002528
MRDS ID A013471
Record type Site
Current site name Unnamed (near Chitsia Mountain)

Geographic coordinates

Geographic coordinates: -150.24792, 64.00265 (WGS84)
Relative position Three unnamed occurrences are situated on a rounded hill approximately 3 miles northwest of Chitsia Mountain. The approximate center of the 1/2 square mile area that contains the three occurrences are NE1/4SW1/4 section 35, T. 10 S., R. 14 W., of the Fairbanks Meridian. The nearest settlement is Bearpaw, which can be accessed by the Kantishna River and a sled road from Nenana. It is locality 1 of Cobb and Chapman (1981), who summarized relevant references under the name 'Unnamed occurrence'.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Lead Primary
Gold Secondary
Zinc Secondary

Materials information

Materials Type of material
Galena Ore
Quartz Gangue

Host and associated rocks

  • Host or associated Host
    Stratigraphic age (youngest) Middle Mississippian
    Stratigraphic age (oldest) Early Devonian

Nearby scientific data

(1) -150.24792, 64.00265

Comments on the geologic information

  • Geologic Description = The Chitsia Mountain area is underlain by Middle Devonian to Early Mississippian Totatlanika Schist (Wilson and others, 1998). This formation consists of slightly metamorphosed volcanic sedimentary rocks, including various phyllites, silicified greenschist, and nonresistant greenschist tuffs. It is intruded by resistant porphyro-aphanitic rhyolite (Bundtzen and others, 1976). Regionally, the area contains a system of northeast-trending strike-slip and related conjugate faults associated with Cretaceous to Tertiary plutonic rocks and coeval or younger volcanic rocks (Clautice and others, 1993). ? the three occurrences consist of a quartz vein system trending N55E and dipping 55 degrees SE, hosted in the rhyolite. The quartz veins locally contain limonite and galena. A sulfide-bearing quartz vein sample was assayed by atomic absorption and contained 0.05 ounces Ag per ton, 0.01 ounces Au per ton, less than 0.01 percent Cu, 0.01percent Pb, 0.02 percent Zn, less than 0.01 percent Mo, and less than 0.01percent Sb. A stream-sediment sample collected near the rhyolite was assayed by atomic absorption and contained 0.03 ppm Au, 34 ppm Cu, 24 ppm Pb, 125 ppm Zn, and 1.10 ppm Ag (Bundtzen and others, 1976). These areas of base-metal vein mineralization in rhyolite are interpreted to have potential for large low-grade and smaller high-grade metallic deposits (Bundtzen and others, 1976). There are no indications of production.
  • Age = Younger than the Middle Devonian to Early Mississippian Totatlanika Schist; probably related to Cretaceous to Tertiary plutonism.
  • Age = Host rock is Early Mississippian - Middle Devonian.

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Kantishna

Comments on the production information

  • Production Notes = There are no indications of production.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A013471
USGS Alaska Resource Data File ARDF KH008

Bibliographic references

  • Deposit

    Chapman, R.M., 1975, Geology of western half of the Kantishna River quadrangle: U.S. Geological Survey Circular 722, 58 p.

  • Deposit

    Bundtzen, T.K., Smith, T.E., and Tosdal, R.M., 1976, Progress report: Geology and mineral deposits of the Kantishna Hills, Alaska: Alaska Division of Geological and Geophysical Surveys Open-File Report AOF-98, 80 p., 2 sheets, scale 1:63,360.

  • Deposit

    Chapman, R.M., and Yeend, W., 1981, Geologic reconnaissance of the east half of the Kantishna River quadrangle and adjacent areas, in Albert, N.R.D., and Hudson, T., eds, The United States Geological Survey in Alaska, Accomplishments during 1979: U.S. Geological Survey Circular 823-B, 149 p.

  • Deposit

    Cobb, E.H., and Chapman, R.M., 1981, Mineral occurrences (other than mineral fuels and construction materials) in the Kantishna River and Ruby quadrangles, Alaska: U.S. Geological Survey Open-File Report 81-170, 94 p.

  • Deposit

    Clautice, K.H., Bowman, N.D., Clough, J.G., Gilbert, W.G., Kline, J.T., Smith, T.E., and Blodgett, R.B., 1993, Land selection Unit 8 (Kantishna River, Ruby, and Medfra quadrangles): References, lead isotope, geochemical and major oxide data: Alaska Division of Geological and Geophysical Surveys, 42 p., 1 sheet, scale 1:250,000.

  • Deposit

    Wilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of central (interior) Alaska: U.S. Geological Survey Open-File Report 98-133, 17 p., 2 sheetsm, scale 1:500,000.

Comments on the references

  • Primary Reference = Bundtzen and others, 1976

General comments

Subject category Comment text
Deposit Model Name = Plutonic-related mesothermal, shear-hosted veining.

Reporter information

Type Date Name Affiliation Comment
Reporter 08-NOV-1999 Cameron S. Rombach Alaska Division of Geological and Geophysical Surveys