Nail Allocthon

The Nail Allocthon is a chromium 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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Site Name

Primary: Nail Allocthon
Secondary: Nickel Creek
Secondary: Rick's Nickel Prospect
Secondary: Noribu Claims

Commodity

Primary: Chromium
Tertiary: Nickel

Location

State: Alaska
District: Fairbanks

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Years of Production:
Organization:
Significant: N
Deposit Size: S

Physiography

Not available

Mineral Deposit Model

Not available

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Silica-Carbonate Replacement Of Serpentinized Peridotite At Base Of Thrust Sheet

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Chromite
Gangue: Magnetite

Comments

Comment (Commodity): NO ANOMALOUS NI FOUND IN 1984 USBM STUDY, THOUGH AREA WAS STAKED FOR NI

Comment (Deposit): PROSPECTORS FOR NI MAY HAVE MISTAKEN FUCHSITE IN ALTERED ROCK FOR GARNIERITE; NI CONTENT OF THE BODY IS VERY LOW ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT

Comment (Development): 3 LODE CLAIMS STAKED FOR NI IN 1953; SEE DEPOSIT DESCRIPTION COMMENTS; USBM BENEFICIATION AND METALLURGICAL TESTS, 1984, SHOWED ORE TO BE SUBECONOMIC

Comment (Location): COINCIDENT WITH VABM "NAIL"; MINERALIZATION OCCURS IN ULTRAMAFIC BODY OVER 60 SQ KM IN AREA LAND STATUS VALUE CALCULATED 6-94 USING GIS OVERLAY ANALYSIS WITH BLM 1:2,500,000 SCALE OWNERSHIP STATUS MAP (1991).

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

Comment (Deposit): TABULAR ULTRAMAFIC BODY 12 KM LONG AND 610 M THICK CONTAINS 0.25 TO 4.0% COARSE DISSEMINATED CHROMITE OVER WIDE AREA; CHROMITE ALSO OCCURS IN RARE PODS MEASURING ABOUT 1 FT BY 3 FT; OVERALL CHROMITE CONTENT OF BODY IS LESS THAN 1%; ALTHOUGH PORTIONS OF NAIL RIDGE WERE AT ONE TIME STAKED FOR NI, ONLY TRACE AMOUNTS WERE FOUND IN SILICA-CARBONATE ZONE ADJACENT TO SERPENTINIZED PERIDOTITE DURING 1984 USBM INVESTIGATION

Comment (Reserve-Resource): USBM INVESTIGATION CONCLUDED THAT (1) THE ULTRAMAFIC ROCKS DO NOT CONSTITUTE A POTENTIAL CHROMITE RESOURCE, (2) NO SIGNIFICANT AU OR PT-GROUP ELEMENTS ARE PRESENT, (3) ANOMALOUS CU, SB, AS AND AG FOUND IN ONE OCCURRENCE OF ALTERED ROCK IS TOO LIMITED IN EXTENT AND MADE OF OCCURRENCE DOES NOT SUGGEST THE LIKELIHOOD OF ECONOMIC CONCENTRATIONS OF THESE ELEMENTS BEING PRESENT, AND (4) EXTENSIVE ZONE OF MAGNESITE-RICH SILICA ROCK HAS LOW ECONOMIC POTENTIAL DUE TO INACCESSIBILITY AND THE EXISTENCE OF CHEAPER ALTERNATIVE SOURCES OF MAGNESITE IN THE U.S.

Comment (Geology): THE TABULAR ULTRAMAFIC BODY AT NAIL RIDGE COMPRISES A THRUST SHEET OVERLYING A COMPLEX ASSEMBLAGE OF GREENSCHIST FACIES METAMORPHIC ROCKS; UNALTERED PORTION OF ULTRAMAFIC BODY IS COMPOSED DOMINANTLY OF HARZBURGITE, WITH 10-15% DUNITE, AND MINOR GABBRO; ALTERATION AT BASE CONSISTS OF SERPENTINIZED PERIDOTITE UNDERLAIN BY ORANGE-WEATHERING QUARTZ-OPAL-CHALCEDONY-ANKERITE-FUCHSITE ROCK WITH SERPENTINE VEINLETS, WHICH IS IN TURN UNDERLAIN BY MASSIVE GRAY SILICA-MAGNESITE-DOLOMITE ROCK. "NAIL" ALLOCTHON; USBM OFR 176-84.

References

Reference (Deposit): USGS OFR 78-529D, P. 32, LOC. 26

Reference (Other Database): BAG-OFR-78-529D-26

Reference (Deposit): USGS BULL 1246, P. 221

Reference (Deposit): TDM PAM 1, P. 16, 18

Reference (Deposit): USBM OFR 176-84

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