1. Mineral Resources
  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

Unnamed (near Bush Mountain)

Occurrence in Alaska, United States with commodities Silver, Gold, Copper
Map
XML
JSON
KML
C

Geologic information

Identification information

Deposit ID 10307680
Record type Site
Current site name Unnamed (near Bush Mountain)

Geographic coordinates

Geographic coordinates: -131.51976, 55.22274 (WGS84)
Relative position This occurrence is at an elevation of about 1600 feet on the south slope of Bush Mountain, about 0.45 mile south-southwest of the top of the mountain. The site is in section 2, T. 77 S., R. 92 E., of the Copper River Meridian. It corresponds to loc. 8 in Karl (1992). The location is accurate within about 300 feet.
(click for info)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Gold Primary
Copper Primary

Materials information

Materials Type of material
Pyrite Ore
Pyrrhotite Ore
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) -131.51976, 55.22274
ListMap

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]; Berg and others, 1988; Karl, 1992). The rocks were regionally metamorphosed to greenschist-grade phyllite and semischist in Late Cretaceous time. The occurrence consist of green tuffaceous phyllite and gray argillaceous phyllite that contain disseminated pyrite, and of quartz-pyrite veins (Karl, 1992, loc. 6). The pyrite also coats fractures in the country rocks. Locally, the pyrite is accompanied by pyrrhotite. Samples of green phyllite containing disseminations and veins of sulfide minerals assayed up to 0.1 ppm Au, 3 ppm Ag, and 1000 ppm Cu.
  • 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 green phyllite containing disseminations and veins of sulfide minerals assayed up to 0.1 ppm Au, 3 ppm Ag, and 1000 ppm Cu.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF KC165

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

    Berg, H.C., Elliott, R.L., and Koch, R.D., 1988, Geologic map of the Ketchikan and Prince Rupert quadrangles, southeastern Alaska: U.S. Geological Survey Mineral Investigations Series Map MF-1807,27 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 = 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