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Unnamed (northwest of Rainbow Basin)

Occurrence in Alaska, United States with commodities Molybdenum, Gold
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Alteration
  8. Mineral occurrence model information
  9. Host and associated rocks
  10. Nearby scientific data
  11. Economic information about the deposit and operations
  12. Mining district
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10021689
MRDS ID DE00941
Record type Site
Current site name Unnamed (northwest of Rainbow Basin)

Geographic coordinates

Geographic coordinates: -159.13271, 59.71932 (WGS84)
Relative position Rainbow Basin is a lowland between the drainage at the head of Amakuk Arm of Lake Nerka to the west and the Golden Horn segment of Lake Beverly to the east. This approximately located occurrence is in the uplands on the north side of Rainbow Basin. The map site is on an unnamed creek at an elevation of about 700 feet, in the NW1/4 of section 27, T 5 S, R 58 W, of the Seward Meridian. It is area 1 of Kilburn and others (1992). The location possibly is accurate within a mile.

Site location context

Political divisions (FIPS codes)

Dillingham(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Goodnews Bay C-1(quadrangle 1:63,360 scale)

Goodnews Bay NE(quadrangle 1:100,000 scale)

Goodnews Bay(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Wood River(hydrologic unit)

Nushagak River(hydrologic accounting unit)

Southwest(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Wood-Tikchik State Park(State Park)

State Park ST(Type of land area)

ST(Federal land areas administered by ST)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Molybdenum Primary
Gold Secondary

Materials information

Materials Type of material
Arsenopyrite Ore
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) -159.13271, 59.71932
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = A highly oxidized, Cretaceous or Tertiary granitic stock surrounded by iron-stained argillite hornfels underlies the headwaters of a stream draining south to Rainbow Basin. The occurrence described in this record is about 2 miles northwest of Rainbow Basin (Kilburn and others, 1992). It consits of hornfels that contains disseminated sulfides and is cut by arsenopyrite- and pyrite-bearing quartz veins and stockworks. Individual veins are up to 1/4 inch thick. Thin felsic dikes cut the mineralized veins in places. Float samples of hornfels, silicified hornfels, and sulfide-bearing veinlets collected at the head of the drainage contain up to 1.1 ppm Ag, greater than 3,800 ppm As, 1.35 ppm Au, 400 ppm Bi, 780 ppm Cu, 21 ppm Mo, 303 ppm Ni, 64 ppm Sb, and 20 ppm Sn (Kilburn and others, 1992).
  • Age = Probably Late Cretaceous or Early Tertiary. Mineralization is probably related to the granitic plutons in the area, which are inferred to be part of a regionally extensive Upper Cretaceous and Lower Tertiary plutonic suite (Hoare and Coonrad, 1978).

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.

Reference information

Bibliographic references

  • 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)
Deposit Other Comments = This occurrence is in Wood-Tikchik State Park.

Reporter information

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

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.