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  3. Mineral Resource Data System (MRDS)

Inmachuk River Area

Past Producer in Alaska, United States with commodities Gold, Tin, Lead, Mercury, Silver
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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. Ore body information
  10. Controls for ore emplacement
  11. Economic information about the deposit and operations
  12. Workings at the site
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10000531
MRDS ID A010728
Record type Site
Current site name Inmachuk River Area
Alternate or previous names Includes: Inmachuk & Pinnell Rivers, Perry, Cunningham & Nelson Gulch Creeks

Geographic coordinates

Geographic coordinates: -162.98674, 65.91604 (WGS84)
Relative position 21 MILES N OF IMURUK LAKE, BETWEEN CRIPPLE & KUGRUK RIVERS

Site location context

Political divisions (FIPS codes)

Northwest Arctic(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Bendeleben D-2(quadrangle 1:63,360 scale)

Bendeleben NE(quadrangle 1:100,000 scale)

Bendeleben(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Goodhope-Spafarief Bay(hydrologic unit)

Northern Seward Peninsula(hydrologic accounting unit)

Northwest(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

NANA Regional Corporation, Incorporated(ANCSA Region)

ANCSA Region NTVPIC(Type of land area)

NTVPIC(Federal land areas administered by NTVPIC)

Geographic areas

Country State
United States Alaska

Comments on the location information

  • A PRODUCTIVE PLACER AREA OF APPROXIMATELY 50 SQ MI.; INCLUDES TRIBUTARIES OF LOWER INMACHUK RIVER; AREA OF INTEREST W & SW OF GIVEN LOCATION LAND STATUS VALUE CALCULATED 6-94 USING GIS OVERLAY ANALYSIS WITH BLM 1:2,500,000 SCALE OWNERSHIP STATUS MAP (1991).

Commodities

Commodity Importance
Gold Primary
Tin Critical Primary
Lead Secondary
Mercury Secondary
Silver Secondary

Comments on the commodity information

  • AU RECOVERED ROUGH; AUGULAR FLAKES ALSO, SMOOTH, REWORKED

Materials information

Materials Type of material
Cassiterite Ore
Cinnabar Ore
Galena Ore
Gold Ore
Silver Ore
Garnet Gangue
Hematite Gangue
Magnetite Gangue
Pyrite Gangue

Analytical data

Result SOME AU ASSAYS AS HIGH AS 0.80 OZ/TON, 5.7 OZ/TON AG.

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Quartzite
  • Host or associated Host
    Rock type Unconsolidated Deposit > Gravel
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Mafic Volcanic Rock > Basalt

Nearby scientific data

(1) -162.98674, 65.91604
ListMap

Economic information

Ore body information

  • Thickness 3.05M
    Depth to top 7.62M

Controls for ore emplacement

  • Auriferous Gravels

Comments on the geologic information

  • SOME OF GRAVEL MINED MAY BE CORRELATIVE TO TERTIARY KOUGAROK GRAVEL ; MAJOR.UNITS: PREDOMINENTLY SCHIST, LIMESTONE, WITH GRANITIC INTRUSIONS ; REG.COM: LODE DEPOSITS, LOCATED IN SCHIST BEDROCK, WITHIN THE AREA ARE MOST PROBABLE SOURCES OF GOLD AND OTHER MINERALS

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1901

Comments on the production information

  • NO FIGURES AVAILABLE, ALTHOUGH PRODUCTION MUST HAVE BEEN FAIR TO GOOD

Workings at the site

  • Type of workings Surface/Underground
    Overall depth 6.1M

Comments on the workings information

  • FAIRHAVEN DITCH, COMPLETED IN 1908, BROUGHT WATER 40 MILES FROM IMURUK LAKE, ENABLED LARGE-SCALE ACTIVITY TO INCREASE IN THIS AREA; SOME DRIFTING TO RECOVER GOLD OVERLAID BY LAVA FLOWS; MUCH OF GRAVEL FROZEN

Comments on development

  • CONTINUOUS MINING FROM 1912 TO 1963 (DREDGES AT INMACHUK & PINNEL RIVERS)

Reference information

Bibliographic references

  • Deposit

    USGS B1374, P.71-72

  • Deposit

    USGS OFR, P.

General comments

Subject category Comment text
Deposit MOST PRODUCTION FROM DREDGES ON INMACHUK & PINNEL RIVERS

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1984 Garrison, Michael T. (Elliott, R. L.) 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.