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Spruce Hen Prospect

Occurrence in Alaska, United States with commodities Tungsten, Molybdenum
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Geologic information

Identification information

Deposit ID 10002826
MRDS ID A015298
Record type Site
Current site name Spruce Hen Prospect
Related records 10160331

Geographic coordinates

Geographic coordinates: -147.51962, 64.95745 (WGS84)
Location accuracy 1000(meters)
Relative position 11 MILES NE OF FAIRBANKS
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Geographic areas

Country State
United States Alaska

Comments on the location information

  • USGS MF-410, LOC. 29. PROSPECT ON THE DIVIDE BETWEEN THE HEADWATERS OF STEELE AND FIRST CHANCE CREEKS. LAND STATUS VALUE CALCULATED 6-94 USING GIS OVERLAY ANALYSIS WITH BLM 1:2,500,000 SCALE OWNERSHIP STATUS MAP (1991).

Commodities

Commodity Importance
Tungsten Primary
Molybdenum Tertiary

Materials information

Materials Type of material
Molybdenite Ore
Scheelite Ore
Calcite Gangue
Clinozoisite Gangue
Diopside Gangue
Garnet Gangue
Hornblende Gangue
Vesuvianite Gangue

Alteration

  • (Local) Ground-Water Leaching Of Scheelite In Weathered Zone May Have Occured

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Granite
  • Host or associated Host
    Rock type Metamorphic Rock > Schist

Nearby scientific data

(1) -147.51962, 64.95745
ListMap

Comments on the geologic information

  • SEAMS OF GOUGE ALONG WALLS OF LODE. DEPOSIT ALONG WESTERN PERIPHERY OF LARGE BODY OF PORPHYRITIC GRANITE. SCHEELITE CONCENTRATIONS IN ZONES AS MUCH AS 6 IN. WIDE.

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant No

Mining district

District name Fairbanks

Comments on the workings information

  • WORKINGS CONSISTED OF A 70 FT. INCLINED SHAFT, PITS, AND TRENCHES

Comments on development

  • CLAIMS STAKED BY SUMMER, 1916. 5 LODES PROSPECTED BY TRENCHES. NO RECORD OF ANY PRODUCTION.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A015298

Bibliographic references

  • Deposit

    USGS MF-410 (D-2), LOC. 29

  • Deposit

    USGS BULL. 662, P. 422-423.

  • Deposit

    USGS BULL. 188, 201-203.

General comments

Subject category Comment text
Deposit SMALL GRAINS OF SCHEELITE ARE DISSEMINATED THROUGHOUT 5 LODES AS MUCH AS 4 FT. WIDE IN SCHIST WITH SOME INTERBEDDED LIMESTONE AND METAMORPHOSED BASIC IGNEOUS ROCK. LODES ARE SKARN DEPOSITS WITH SCHEELITE, FLUORITE, GARNET, AND OTHER TYPICAL CONTACT-METAMORPHIC MINERALS THAT REPLACED LIMESTONE; ABOUT 3 FT. THICK. ONE LODE IS CUT BY BY SCHEELITE-BEARING QUARTZ VEIN. SCHEELITE IN ZONES IN BLOCKS OF ALTERED IGNEOUS ROCK (MAINLY HORNBLENDE) ON DUMP. A LITTLE MOLYBDENITE REPORTED IN ORE
Deposit NO GOLD ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAY-1987 Powers, M.T. (Huber, D.F.) U.S. Geological Survey
Editor 20-SEP-1994 Mosier, Dan U.S. Geological Survey PARSED OUT HOST ROCK AND ASSOCIATED ROCK TYPES, AGES, UNIT NAMES, AND UNIT AGES.