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Stepovich-Cleary Hill Mine

Past Producer in Alaska, United States with commodities Tungsten, Antimony, Beryllium, Molybdenum
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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. Host and associated rocks
  8. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Mining district
  11. Links to other databases
  12. Bibliographic references
  13. General comments
  14. Reporter information

Geologic information

Identification information

Deposit ID 10101018
MRDS ID A015304
Record type Site
Current site name Stepovich-Cleary Hill Mine

Geographic coordinates

Geographic coordinates: -147.36962, 64.98078 (WGS84)
Location accuracy 250(meters)
Relative position 14 MILES NE OF FAIRBANKS

Site location context

Political divisions (FIPS codes)

Fairbanks North Star(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Fairbanks D-1(quadrangle 1:63,360 scale)

Big Delta NW(quadrangle 1:100,000 scale)

Fairbanks(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Comments on the location information

  • USGS MF-410. MINE JUST WEST OF SUMMIT OF GILMORE DOME 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 Critical Primary
Antimony Critical Tertiary
Beryllium Critical Tertiary
Molybdenum Tertiary

Materials information

Materials Type of material
Molybdenite Ore
Scheelite Ore
Stibnite Ore

Host and associated rocks

  • Host or associated Host
    Rock type Plutonic Rock > Pegmatite
    Rock unit name Birch Creek Schist;;;
    Rock description Birch Creek Schist;;;

Nearby scientific data

(1) -147.36962, 64.98078
ListMap

Economic information

Comments on the geologic information

  • ROCKS THAT CONSTITUTE LODE ARE CRYSTALINE LIMESTONE, GRANULAR SCHEELITE ORE (REPLACEMENT OF LIMESTONE), QUARTZ PEGMATITE, AND SILICATED MICA SCHIST. CRYSTALINE LIMESTONE IS IN DISCONTINUOUS, IRREGULAR BODIES AT SAME STRATIGRAPHIC HORIZON AS SCHIST; AVERAGE THICKNESS 2 FT; MAY BE 10 FT. IN TROUGHS AND CRESTS OF FOLDS. MANY VARIATIONS IN STRIKE OF LODE BECAUSE OF DRAG FOLDING. LODE OFFSET AS MUCH AS SEVERAL TENS OF FEET ALONG STEEP NORTHWARD STRIKING FAULTS.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1915
Year of first production 1915
Year of last production 1944

Mining district

District name Fairbanks

Comments on the workings information

  • ABOUT 2,000 FT. OF UNDERGROUND WORKINGS. WORKINGS CAVED

Comments on development

  • MINING REPORTED 1915-18 AND 1942-44. DURING 1915-18 INCLINED SHAFTS WERE DRIVEN DOWN DIP OF LODE. MILL INSTALLED IN 1917. IN 1931 A 170 FT. ADIT DID NOT REACH LODE. IN 1942-44 CLEARY HILL MINES CO. LEASED CLAIMS HELD BY M. STEPOVICH AND SANK 170 FT. INCLINED SHAFT ON LODE WITH LEVELS AT 50 FT AND 150 FT. DOWN SHAFT; ADIT INTERSECTED DRIFT ON 150 FT. LEVEL.

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit CRYSTALLINE LIMESTONE BED IN SCHIST THAT THICKENED IN CRESTS AND TROUGHS LARGELY REPLACED BY CALC-SILICATE MINERALS, QUARTZ, AND SCHEELITE. SCHEELITE OCCURS DISSEMINATED IN MINERALIZED ZONES OR AS ORE SHOOTS IN COUNTRY ROCK; RICHEST GRANULAR ORE SHOOTS LOCALIZED AT INTERSECTION OF SCHEELITE BEARING QUARTZ PEGMATITES AND LIMESTONE IN IRREGULAR LENSES THAT REPLACED LIMESTONE. SCHEELITE (NOT ORE GRADE) IN SILICATED SCHIST. BERYLLIUM AND MELIPHANITE FORMED BY CONTACT METAMORPHISM. MINERALIZATION PARALLEL TO CLEAVAGE OF SCHIST.
Deposit DEPOSIT AT EASTERN END OF MASS OF PORPHYRITIC GRANITE. ; 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.

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.