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Inmachuk River Placer

Past Producer in Alaska, United States with commodities Gold, Mercury
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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. Links to other databases
  11. Bibliographic references
  12. General comments
  13. Reporter information

Geologic information

Identification information

Deposit ID 10001888
MRDS ID A012714
Record type Site
Current site name Inmachuk River Placer
Alternate or previous names Claim Groups: Utica, Dashley, Polar Bear, Homestake
Related records 10233333

Geographic coordinates

Geographic coordinates: -163.08952, 65.88298 (WGS84)

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-3(quadrangle 1:63,360 scale)

Bendeleben NE(quadrangle 1:100,000 scale)

Bendeleben C(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

  • MOUTH OF N-TRENDING TRIB. OPPOSITE MOUTH OF PINNELL R.; PLACER MINE TAILINGS NEARLY CONTINUOUS FROM DITCH (ABOUT 1 MILE UPSTREAM) TO MOUTH OF FINK CR., A DISTANCE OF ABOUT 3 MILES. 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
Mercury Tertiary

Comments on the commodity information

  • CINNABAR PEBBLES UP TO 0.5 IN IN DIAMETER N DREDGE CONC., TDM PAM 5-R, P. 34.

Materials information

Materials Type of material
Gold Ore
Hematite Gangue
Cinnabar Unknown

Analytical data

Result AU WORTH $18.39/OZ, PRICE OF AU = $20.67/FINE OZ, USGS BULLETIN 263, P. 209.

Host and associated rocks

  • Host or associated Host
    Rock type Unconsolidated Deposit > Gravel
  • Host or associated Host
    Rock type Unconsolidated Deposit > Sand and Gravel
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone

Nearby scientific data

(1) -163.08952, 65.88298
ListMap

Economic information

Comments on the geologic information

  • SOME OF THE DEPOSIT MAY BE CORRELATIVE TO KOUGAROK GRAVEL (LATE TERT. TO PLEISTOCENE) OF HOPKINS, 1963, USGS BULLETIN 1141-C. ; MAJOR.UNITS: GREENSCHIST GRADE CHLORITIC SCHIST, MARBLE, GRAPHITIC SCHIST AND QUARTZITE; LOCALLY OVERLAIN BY REMNANTS OF IMURUK LAKA BASALTIC LAVA; MORE THAN 1 MILE OF LOESS COVERS AREA. ; REG.COM: SOME AU WAS RECONCENTRATED FROM OLD CHANNEL THAT PARALLELS PINNELL R., WHERE IT CROSSES THE INMACHUK R.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1903

Comments on the production information

  • $400,000 - $500,000 WORTH OF AU PRODUCED, MAINLY BY WINTER DRIFT MINING, BEFORE 1908, PRICE OF AU = $20.67/FINE OZ.

Comments on the workings information

  • MINED EXTENSIVELY; MOST OF DRAINAGE HAS BEEN DREDGED.

Comments on development

  • SMALL-SCALE MINING, MAINLY WINTER DRIFT MINING, BELOW MOUTH OF PINNEL R. UNTIL FAIRHAVEN DITCH WAS COMPLTED IN 1908; HYDRAULIC AND OR OTHER NON-FLOAT MINING MOST YEARS BETWEEN 1908-1940; 1-2 DREDGES OPERATED: 1913-14, 1916, 1918, AND 1931-40; NO DATA ON ANY MORE RECENT ACTIVITY.

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit 2-7 FT OF MUCK OVER 6-8 FT OF GRAVEL; FLOODPLAIN 800-1200 FT WIDE, BEDROCK, BASAL 2-3 FT OF GRAVEL AND TOP 1 FT OF CARBONATE BEDROCK; OLD CHANNEL UNDERNEATH LAVA FLOW MINED ON N SIDE OF RIVER, OPPOSITE THE MOUTH OF PINNELL R.
Deposit SEE ALSO: (PINNELL R.), (PERRY CR.) ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT
Deposit THIS SITE NAME WAS CREATED BY THE REPORTER OR OTHER USGS EMPLOYEE BASED ON PROXIMITY TO SOME MAJOR GEOGRAPHIC FEATURE.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-APR-1987 Leonard, Kenneth R. (Huber, Donald F.) 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.