The Nunatak Molybdenum Prospect

The The Nunatak Molybdenum Prospect is a molybdenum mine located in Alaska at an elevation of 600 feet.

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

Satelite View

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: The Nunatak Molybdenum Prospect

Commodity

Primary: Molybdenum
Secondary: Copper
Tertiary: Gold
Tertiary: Silver

Location

State: Alaska
District: Juneau/Glacier Bay

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Prospect
Operation Type: Unknown
Discovery Year: 1941
Years of Production:
Organization:
Significant: N
Deposit Size: M

Physiography

Not available

Mineral Deposit Model

Not available

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Outward From Quartz Monzonite, Limestone And Argellites Undergo Silicified, Skarn, And Cherty Haloes

Rocks

Name: Quartz Monzonite
Role: Associated
Age Type: Associated Rock
Age Young: Late Cretaceous

Analytical Data

Not available

Materials

Ore: Molybdenite
Ore: Chalcopyrite
Ore: Bornite
Ore: Tetrahedrite
Ore: Gold
Ore: Malachite
Gangue: Alunite
Gangue: Albite
Gangue: Pyrrhotite
Gangue: Pyrite
Gangue: Enargite
Gangue: Epidote
Gangue: Chlorite

Comments

Comment (Deposit): LARGE DEPOSIT, BUT LOW-GRADE. DEPOSIT AND SURROUNDING AREA AN EXCELLENT EXPLORATION TARGET ; INFO.SRC : 1 PUB LIT

Comment (Deposit): LIMESTONE AND LIMEY ARGELLITES (HORNFELS) HAVE BEEN INTRUDED BY QUARTZ MONZONITE DIKES, PLUGS, AND STOCKS CAUSING SILICIFIED, SKARN, AND CHERTY HALO ALTERATION. STOCK-WORK OF CLOSELY SPACED QUARTZ VEINS AND VEINLETS CONTAIN MOLYBDENITE AS SELVAGES, OR THIN FILMS ALONG THEIR BORDERS, ROSETTES OF MOLYBDENITE CRYSTALS, AND DISSEMINATIONS OF MOLYBDENITE. VEINS ALSO CONTAIN MINOR TO TRACE AMOUNTS OF PYRITE, PYRRHOTITE, CHALCOPYRITE, TETRAHEDRITE, BORNITE, ENARGITE, ALUNITE, POTASSIUM FELDSPAR, EPIDOTE, ALBITE, MALACHITE, AND CHLORITE. MOLYBDENITE MINERALIZATION SURROUNDS QUARTZ MONZONITE PORPHYRY DIKES AND PLUGS. MINERALIZATION IS MAINLY CONFINED TO THE SKARN ALTERATION IN THE LIMESTONE AND HORNFELS, AND EXTENDS TO THE BEACH ON THE NORTH SIDE AND TO A SMALL LAKE ON THE SOUTH, A HORIZONTAL DISTANCE OF 4,600 FT OVER A 1,100 FT. VERTICAL EXPOSURE. MINERALIZATION EXTENDS UNDER MUIR INLET TO THE NW AND UNDER GLACIAL MORAINE TO THE NE. DEPOSIT CONTAINS INDICATED 145 MILLION TONS OF

Comment (Deposit): MATERIAL ACCESSIBLE TO SURFACE MINING AT GRADE OF 0.04-0.06% MO AND 0.02% CU AND INFERRED 9.1 MILLION TONS BELOW SEA LEVEL NEAR COASTLINE AT 0.06% MO AND 0.02% CU. INDICATED GROSS IN PLACE VALUE OF DEPOSIT IS $550 MILLION (1978). DATA FROM USGS OF 78-494, P. 239.

Comment (Location): USGS P 632, LOC. 21, PLATE 12, SAMPLE 66 ARE-23; USGS OF 78-494, PLATE IV LAND STATUS VALUE CALCULATED 6-94 USING GIS OVERLAY ANALYSIS WITH BLM 1:2,500,000 SCALE OWNERSHIP STATUS MAP (1991).

Comment (Development): DISCOVERED IN 1941, MAPPED BY USGS AND USBM IN 1942, WITH TWO HOLES DRILLED. AMERICAN EXPLORATION AND MINING DRILLED 3 HOLES IN 1966, SUPERIOR OIL DRILLED 7 MORE IN 1968. 38 ACTIVE CLAIMS

Comment (Geology): LIMESTONE AND LIMEY ARGILLITES INTRUDED BY QUARTZ MONZONITE PORPHYRY DIKES, PLUGS, AND STOCKS.

Comment (Workings): 11 DIAMOND DRILL HOLES DRILLED AT DEPTHS UP TO 892 FT., NUMEROUS SURFACE SAMPLE TRENCHES

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 OF 78-494, PLATE IV, P. C-274-295 (1978)

Reference (Deposit): USGS P 632, PLATE 1, 11, 12, P. 74-78 (1971)

Reference (Deposit): USGS MF-436, LOC. 43 (1972)

Reference (Deposit): USGS B 1121-K, P. K 49 (1963)

Reference (Other Database): BAG-P-632-21

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