Inmachuk River Placer

The Inmachuk River Placer is a gold mine located in Alaska.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

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MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.

Site Name

Primary: Inmachuk River Placer
Secondary: Claim Groups: Utica
Secondary: Dashley
Secondary: Polar Bear
Secondary: Homestake

Commodity

Primary: Gold
Tertiary: Mercury

Location

State: Alaska

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Discovery Year: 1903
Years of Production:
Organization:
Significant: N
Deposit Size: S

Physiography

Not available

Mineral Deposit Model

Not available

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

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

Materials

Ore: Gold
Gangue: Hematite
Unknown: Cinnabar

Comments

Comment (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.

Comment (Commodity): CINNABAR PEBBLES UP TO 0.5 IN IN DIAMETER N DREDGE CONC., TDM PAM 5-R, P. 34.

Comment (Location): 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).

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

Comment (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.

Comment (Workings): MINED EXTENSIVELY; MOST OF DRAINAGE HAS BEEN DREDGED.

Comment (Geology): 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.

Comment (Deposit): SEE ALSO: (PINNELL R.), (PERRY CR.) ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT

Comment (Deposit): THIS SITE NAME WAS CREATED BY THE REPORTER OR OTHER USGS EMPLOYEE BASED ON PROXIMITY TO SOME MAJOR GEOGRAPHIC FEATURE.

References

Reference (Deposit): USGS BULLETIN 247, P. 58-60.

Reference (Deposit): USGS BULLETIN 263, P. 209.

Reference (Deposit): USGS BULLETIN 379, P. 355, 357-361.

Reference (Deposit): USGS BULLETIN 442, P. 367-368.

Reference (Deposit): USGS BULLETIN 792, P. 22.

Reference (Deposit): USGS BULLETIN 1141-C, P. C32.

Reference (Deposit): USBM OFR 73-75, P. 43, 48, 76.

Reference (Deposit): USGS OFR 77-796-B, P. 11, LOC. 119.

Reference (Deposit): USGS OFR 78-1-C, P. 20.

Reference (Deposit): BRISKEY, J.A., 1983, UNPUB. USGS ADMIN. REPT., P. 4.

Reference (Other Database): BAG-MF-417-71

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