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The Nunatak Molybdenum Prospect

Prospect in Alaska, United States with commodities Molybdenum, Copper, Gold, Silver
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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. Alteration
  8. Host and associated rocks
  9. Nearby scientific data
  10. Economic information about the deposit and operations
  11. Mining district
  12. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10096789
MRDS ID A013175
Record type Site
Current site name The Nunatak Molybdenum Prospect
Related records 10112596

Geographic coordinates

Geographic coordinates: -136.10432, 58.98529 (WGS84)
Elevation 183

Site location context

Political divisions (FIPS codes)

Hoonah-Angoon(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Mount Fairweather D-1(quadrangle 1:63,360 scale)

Juneau NW(quadrangle 1:100,000 scale)

Mount Fairweather(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Glacier Bay(hydrologic unit)

Northern Southeast Alaska(hydrologic accounting unit)

Southeast Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Glacier Bay National Park(National Park)

National Park NPS(Type of land area)

NPS(Federal land areas administered by NPS)

Geographic areas

Country State
United States Alaska

Comments on the location information

  • 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).

Commodities

Commodity Importance
Molybdenum Primary
Copper Secondary
Gold Tertiary
Silver Tertiary

Materials information

Materials Type of material
Bornite Ore
Chalcopyrite Ore
Gold Ore
Malachite Ore
Molybdenite Ore
Tetrahedrite Ore
Albite Gangue
Alunite Gangue
Chlorite Gangue
Enargite Gangue
Epidote Gangue
Pyrite Gangue
Pyrrhotite Gangue

Alteration

  • (Local) Outward From Quartz Monzonite, Limestone And Argellites Undergo Silicified, Skarn, And Cherty Haloes

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Quartz Monzonite
    Stratigraphic age (youngest) Late Cretaceous
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone

Nearby scientific data

(1) -136.10432, 58.98529
ListMap

Economic information

Comments on the geologic information

  • LIMESTONE AND LIMEY ARGILLITES INTRUDED BY QUARTZ MONZONITE PORPHYRY DIKES, PLUGS, AND STOCKS.

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic
Deposit size Medium
Significant No
Discovery year 1941
Discoverer John Johnson And Tom Smith

Mining district

District name Juneau/Glacier Bay

Comments on the workings information

  • 11 DIAMOND DRILL HOLES DRILLED AT DEPTHS UP TO 892 FT., NUMEROUS SURFACE SAMPLE TRENCHES

Comments on 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

Reference information

Bibliographic references

  • Deposit

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

  • Deposit

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

  • Deposit

    USGS MF-436, LOC. 43 (1972)

  • Deposit

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

  • Other Database

    BAG-P-632-21

General comments

Subject category Comment text
Deposit THIS SITE NAME WAS CREATED BY THE REPORTER OR OTHER USGS EMPLOYEE BASED ON PROXIMITY TO SOME MAJOR GEOGRAPHIC FEATURE.
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
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.
Deposit LARGE DEPOSIT, BUT LOW-GRADE. DEPOSIT AND SURROUNDING AREA AN EXCELLENT EXPLORATION TARGET ; INFO.SRC : 1 PUB LIT

Reporter information

Type Date Name Affiliation Comment
Reporter 01-APR-1987 Leonard, Kenneth R. (Huber, Donald F.) U.S. Geological Survey
Editor 02-SEP-1994 Mosier, Dan U.S. Geological Survey PARSED OUT HOST ROCK AND ASSOCIATED ROCK TYPES, AGES, UNIT NAMES, AND UNIT AGES.

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.