Misheguk Mountain--west

The Misheguk Mountain--west is a pge and 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: Misheguk Mountain--west

Commodity

Primary: PGE
Primary: Chromium
Secondary: Nickel

Location

State: Alaska
District: Noatak

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:

Physiography

Not available

Mineral Deposit Model

Model Name: Podiform chromite (minor)

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Chromite
Ore: Garnierite

Comments

Comment (Deposit): Model Name = Lode; podiform chromite

Comment (Exploration): Status = Inactive

Comment (Workings): Workings / Exploration = Assay values of 4.3% Cr and 0.22% Ni were obtained by the U.S. Bureau of Mines (Degenhart and others, 1978, p. 126, 232-40, 491) over a 50 ft. sample length. Also, chromite pods in dunite and pyroxenite contained up to 0.123 troy oz/st (4200 ppb) Pt, 0.137 troy oz/st (4700 ppb) Pd, 140 ppb Ir, 45 ppb Os, 360 ppb Rh, 98 ppb Ru, and 14 ppb Au. Plagioclase peridotite containing accessory pyrrhotite assayed up to 0.004 troy oz/st Pd and 0.005 troy oz/st Pt, and dunite contained 0.001 troy oz/st (42 ppb) Pt, 22 ppb Pd, 1 ppb Ir, and 6 ppb Rh . Sperrylite and argentite were identified by Scanning Electron Microscope analysis of a PGE-rich iron-rich chromian spinel sample.? ???

Comment (Reserve-Resource): Reserves = Chromium reserve estimates include 117,000-349,000 st Cr2O3 in 9 low-grade banded zones in dunite with associated peridotite, pyroxenite, and gabbro; the largest of these zones contains between 78,000 and 261,000 st Cr2O3. At least 30 additional unmeasured chromite occurrences plus chromite and PGE placer potential are present (Degenhart and others, 1978, p. 232-240, 491).

Comment (Geology): Geologic Description = Chromite, along with a greenish mineral tentatively identified as garnierite, occurs in discontinuous bands less than an inch (25.4 mm) wide, small pods, and disseminations in part of a large serpentinized dunite-peridotite body. Misheguk Mountain is part of an ultramafic body approximately 32 miles long in a northeastern direction and about 13 miles wide. It is part of an ophiolite complex composed of a central core of the serpentinized ultramafic and gabbroic rocks flanked on three sides by mafic volcanic and intrusive rocks of Jurassic, Triassic, and(or) Permian age.

Comment (Reference): Primary Reference = Degenhart and others (1978)

Comment (Deposit): Other Comments = Additional work is required to test the entire ultramafic body for significant occurrences of chromium, nickel, asbestos, and platinum.??See MAS/MILS Sequence # 0020190022 (USBM, 1995)

Comment (Geology): Age = Jurassic

References

Reference (Deposit): Degenhart, C.E., Griffis, R.J., McQuat, J.F., and Bigelow, C.G., 1978, Mineral studies of the western Brooks Range performed under contract to the U.S. Bureau of Mines, Contract #JO155089: U.S. Bureau of Mines Open-File Report 103-78, 529 p., 11 sheets.

Reference (Deposit): Grybeck, D.J., 1977, Known mineral deposits of the Brooks Range, Alaska: US Geological Survey Open-File Report 77-166C, 41 p., 1 sheet, scale 1:1,000,000.

Reference (Deposit): Green, C.B., Bundtzen, T.K., Peterson, R.J., Seward, A.F., Deagen, J.R., and Burton, J.E., 1989, Alaska's mineral industry 1988: Alaska Division of Geological & Geophysical Surveys Special Report 43, 79 p.

Reference (Deposit): Cobb, E.H., Mayfield, C.F., and Brosge, W.P., 1981, Summaries of data on and lists of references to metallic and selected nonmetallic mineral occurrences in eleven quadrangles in northern Alaska (Arctic, Baird Mountains, Chandler Lake, DeLong Mountains, Demarcation Point, Howard Pass, Misheguk Mountain, Mount Michelson, Noatak, Point Lay, and Table Mountain); Supplement to Open-File Report 75-628; Part A, Summaries of data to January 1, 1981: U.S. Geological Survey Open-File Report 81-767-A, 25 p.

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