Unnamed (near Bingo Mountain)

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

Geologic information

Identification information

Deposit ID 10307679
Record type Site
Current site name Unnamed (near Bingo Mountain)

Geographic coordinates

Geographic coordinates: -131.54476, 55.22774 (WGS84)
Relative position This site represents three occurrences in a half-mile-square triangular area southeast of Bingo Mountain The occurrences are in section 3, T. 77 S., R. 92 E., of the Copper River Meridian, and section 35, T. 76 S., R. 91 E., of the Copper River Meridian. They range in elevation from about 1950 feet near the top of the mountain, to about 400 feet elevation, 0.5 mile east-southeast and south-southeast of the top. The coordinates are for the approximate center of the area of occurrences. The site corresponds to loc. 7 in Karl (1992). The location is accurate within 0.1 mile.
(click for info)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Copper Primary
Silver Secondary

Materials information

Materials Type of material
Pyrite Ore
Calcite Gangue
Quartz Gangue

Alteration

  • (Local) Pyritization of tuffaceous phyllite country rock.

Mineral occurrence model information

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

Nearby scientific data

(1) -131.54476, 55.22774

Comments on the geologic information

  • Geologic Description = The country rocks in the area of this site are Upper Jurassic or Cretaceous flyschlike metasedimentary rocks that are gradationally interbedded with andesitic or basaltic metatuff (Berg, 1972 [i 684]; Karl, 1992). The rocks were regionally metamorphosed to greenschist-grade phyllite and semischist in Late Cretaceous time. The occurrences are quartz-calcite-pyrite veins in green tuffaceous phyllite that also contains disseminated minute cubes of pyrite (Karl, 1992, loc. 7). Samples of the sulfide-bearing green phyllite contained up to 0.5 ppm Ag, 300 ppm Cu, and 300 ppm Cr; a sample of a quartz-calcite-pyrite vein contained 0.21 ppm Au (Karl, 1992, loc. 7a-c).
  • Age = Probably Late Cretaceous or younger.

Economic information

Economic information about the deposit and operations

Development status Occurrence

Mining district

District name Ketchikan

Comments on the workings information

  • Workings / Exploration = Samples of the sulfide-bearing green phyllite contained up to 0.5 ppm Ag, 300 ppm Cu, and 300 ppm Cr; a sample of a quartz-calcite-pyrite vein contained 0.21 ppm Au (Karl, 1992, loc. 7a-c).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF KC164

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

    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 = Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a)

Reporter information

Type Date Name Affiliation Comment
Reporter 07-JUL-99 H.C. Berg U.S. Geological Survey