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

Lewis River

Past Producer in Alaska, United States with commodity 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. Mineral occurrence model information
  7. Nearby scientific data
  8. Economic information about the deposit and operations
  9. Mining district
  10. Links to other databases
  11. Bibliographic references
  12. General comments
  13. Reporter information

Geologic information

Identification information

Deposit ID 10309032
MRDS ID A010584
Record type Site
Current site name Lewis River
Related records 10000419

Geographic coordinates

Geographic coordinates: -150.84269, 61.42952 (WGS84)
Relative position MacKevett and Holloway (1977, locality 9) describe mined areas extending three to six miles downstream from the landing strip located near the head of Lewis River on the west side of Mt. Susitna in T. 14, 15 and 16 N., R. 9 W. (U.S. Bureau of Mines, 1998, MAS # 0020840026; Cobb, 1972, MF 385, locality 9; and U.S. Bureau of Mines, 1973).

Site location context

Political divisions (FIPS codes)

Matanuska-Susitna(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Tyonek B-3(quadrangle 1:63,360 scale)

Tyonek SE(quadrangle 1:100,000 scale)

Tyonek(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Yentna 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
Gold Primary

Mineral occurrence model information

Model code 119
USGS model code 39a
Deposit model name Placer Au-PGE
Mark3 model number 54

Nearby scientific data

(1) -150.84269, 61.42952
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = MacKevett and Holloway (1977, locality 9) describe mined areas extending three to six miles downstream from the landing strip located near the head of the Lewis River on the west side of Mt. Susitna. Stream gravel carry coarse angular gold with attached quartz. Cobb (1979, OFR 80-86, p. 17-18) reports that gold is probably derived from quartz veins in local Jurassic or Cretaceous granitic bedrock or from reworked Tertiary conglomerate. Drilling for possible dredging was done in the early 1900's. Placer mining was active mostly before 1918. Bedrock is 12 to 22 feet below surface. According to Brooks (1918, p. 45-47), seven small placer operations operated in 1916 in the canyon between upper basin and the flats and produced over $2,000 in gold (worth $18.66 an ounce). One $2 nugget was found. An unknown but probably small amount of gold recovered in 1956-57 (Cobb, 1973, B 1374, p. 17).
  • Age = Quaternary

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic

Comments on exploration

  • Status = Probably inactive

Mining district

District name Redoubt

Comments on the production information

  • Production Notes = According to Brooks (1918, p. 45-47), seven small placer operations operated in 1916 in the canyon between upper basin and the flats and produced over $2,000 in gold (worth $18.66 an ounce). One $2 nugget was found. Unknown but probably small amount of gold recovered in 1956-57 (Cobb, 1973, B 1374, p. 17).

Comments on the workings information

  • Workings / Exploration = Placer mining was active mostly before 1918. Drilling for possible dredging was done in the early 1900's. Bedrock is 12 to 22 feet below surface.

Reference information

Bibliographic references

  • Deposit

    Brooks, A.H., 1918, Mineral resources of Alaska, 1916: U.S. Geological Survey Bulletin 662, 469 p.

  • Deposit

    Cobb, E.H., 1972, Metallic mineral resources map of the Tyonek quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-385, 1:250,000 scale.

  • Deposit

    Cobb, E.H., 1973, Placer deposits of Alaska: U.S. Geological Survey Bulletin 1374, 213 p.

  • Deposit

    Cobb, E.H., 1979, Summary of references to mineral occurrences (other than minerals fuels and construction materials) in the Kenai and Tyonek Quadrangles, Alaska: U.S. Geological Survey Open-File Report 80-86, 36 p.

  • Deposit

    U.S. Bureau of Mines, 1998, Minerals Availability System/Minerals Industry Location System (MAS/MILS), Talkeetna Quadrangle: Worldwide Web URL http://imcg.wr.usgs.gov/data.html.

  • Deposit

    MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000.

Comments on the references

  • Primary Reference = Cobb, 1973 (B 1374)

General comments

Subject category Comment text
Deposit Model Name = Placer gold(Cox and Singer, 1986; model 39a)

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1998 Madelyn A. Millholland Millholland & Associates
Reporter 01-JUN-1998 James Riehle 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.