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  3. Mineral Resource Data System (MRDS)

Kashwitna River

Occurrence in Alaska, United States with commodities Silver, Gold, Copper
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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. Host and associated rocks
  8. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Mining district
  11. Links to other databases
  12. Bibliographic references
  13. Reporter information

Geologic information

Identification information

Deposit ID 10003479
MRDS ID A106237
Record type Site
Current site name Kashwitna River

Geographic coordinates

Geographic coordinates: -148.96269, 61.91957 (WGS84)
Relative position Generalized point for three widely spaced sample locations. Upper reaches of Kashwitna River, 4.2 miles northeast of Montana Peak. Accurate within 1.5 miles. Locality 9, 10, and 11 of Capps and Tuck (1925).

Site location context

Political divisions (FIPS codes)

Matanuska-Susitna(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Anchorage D-6(quadrangle 1:63,360 scale)

Anchorage NW(quadrangle 1:100,000 scale)

Anchorage C(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Lower Susitna River(hydrologic unit)

Susitna River(hydrologic accounting unit)

South Central Alaska(hydrologic subregion)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Gold Primary
Copper Primary

Materials information

Materials Type of material
Bornite Ore
Chalcocite Ore
Chalcopyrite Ore
Gold Ore
Pyrite Ore
Quartz Gangue

Host and associated rocks

  • Host or associated Host
    Rock type
    Stratigraphic age (youngest) Jurassic
    Stratigraphic age (youngest) Middle Paleocene
    Stratigraphic age (oldest) Early Cretaceous

Nearby scientific data

(1) -148.96269, 61.91957
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Capps and Tuck (1935) report quartz float and numerous quartz veins containing small amounts of pyrite and copper minerals such as chalcopyrite and less commonly borite and chalcocite. Three different occurrences were examined. Veins are as thick as 2 ft and cut hornblende diorite and quartz diorite gneiss. Some veins have been displaced via post-mineral faults, and felsic dike rock is found at some localities. Assays show small amounts of gold (no more than 0.02 oz/ton) and 5.0 oz/ton Ag. ? Bedrock in the vicinity includes: 1) early Paleocene and Late Cretaceous tonalite. The lithology is dominantly biotite-hornblende tonalite and lesser biotite-hornblende quartz diorite; and 2) Jurassic (?) amphibolite and foliated quartz diorite and local, minor quartz-feldspar gneiss.
  • Age = Early Paleocene or younger ; mineralization is hosted in both early Paleocene to Late Cretaceous tonalite and Jurassic quartz diorite gneiss.
  • Age = Host rock is Early Paleocene - Late Cretaceous and Jurassic.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Willow Creek

Comments on the workings information

  • Workings / Exploration = Assays show small amounts of gold (no more than 0.02 oz/ton) and 5.0 oz/ton Ag (Capps and Tuck, 1935). Capps (1940) reports that some samples collected from the Kashwitna Basin are nearly pure bornite.

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Capps and Tuck, 1935

Reporter information

Type Date Name Affiliation Comment
Reporter 30-JUL-1998 D.P. Bickerstaff U.S. Geological Survey
Reporter 30-JUL-1998 S.W. Huss U.S. Geological Survey

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.