Unnamed (northeast of Blunt Mountain)

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

Geologic information

Identification information

Deposit ID 10001619
MRDS ID A012383
Record type Site
Current site name Unnamed (northeast of Blunt Mountain)

Geographic coordinates

Geographic coordinates: -131.36675, 55.15085 (WGS84)
Relative position This site represents five occurrences northeast of Blunt Mountain. The occurrences are in sections 34 and 35, T. 77 S., R. 93 E., of the Copper River Meridian, and range from about 400 feet in elevation to sealevel, and about 1.2-1.7 miles northeast of the highest point on Blunt Mountain . The coordinates are for the approximate center of the approximately half-mile-square area that contains these occurrences. The site corresponds to locs. 8 and 9 in Berg (1972 [I 684]), loc. 142 in Elliott and others (1978), and locs. 27a-b and 28a-c in Karl (1992). The location is accurate within 0.1 mile.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Copper Primary
Lead Primary
Zinc Primary

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Pyrite Ore
Sphalerite Ore
Quartz Gangue

Host and associated rocks

  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite

Nearby scientific data

(1) -131.36675, 55.15085

Comments on the geologic information

  • Geologic Description = The country rocks in the area of these occurrences are recrystallized, Upper Triassic conglomerate and overlying rhyolite and felsic tuff (Berg, 1972). The rocks are complexly folded and faulted, and were regionally metamorphosed to greenschist-grade phyllite and semischist in Late Cretaceous time. ? the deposits consist of quartz fissure veins up to 30 feet thick and 100 feet long that contain clots of pyrite, galena, and chalcopyrite; and of sheared metarhyolite containing sparsely disseminated sphalerite, chalcopyrite, pyrite, and galena (Berg, 1972; Karl, 1992). Variously mineralized samples of veins and country rocks contained up to 0.34 ppm Au, 2.5 ppm Ag, and 0.5% Cu (Karl, 1992, locs. 27, 28) . Soil samples contained as much as 0.27 ppm Au, and detectable Ag.
  • Age = The fissure veins probably are Late Cretaceous.

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Mining district

District name Ketchikan

Comments on the workings information

  • Workings / Exploration = Variously mineralized samples of veins and country rocks contained up to 0.34 ppm Au, 2.5 ppm Ag, and 0.5% Cu (Karl, 1992, locs. 27, 28) . Soil samples contained as much as 0.27 ppm Au, and detectable Ag.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A012383
USGS Alaska Resource Data File ARDF KC145

Bibliographic references

  • Deposit

    Berg, H.C., 1972, Geologic map of Annette Island, Alaska: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-684, 8 p., 1 sheet, scale 1:63,360,

  • Deposit

    Elliott, R.L., Berg, H.C., and Karl, Susan, 1978, map and table describing metalliferous and selected nonmetalliferous mineral deposits, Ketchikan and Prince Rupert quadrangles, Alaska: U.S. Geological Survey Open-file Report, 78-73-B,17 p., scale 1:250,000.

  • Deposit

    Karl, S.M., 1992, Map and table of mineral deposits on Annette Island, Alaska: U.S. Geological Survey Open-File Report 92-690, 57 p., 1 map, scale 1:63,360.

Comments on the references

  • Primary Reference = Karl, 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 06-JUL-1999 H.C. Berg U.S. Geological Survey