Stepovich-Cleary Hill Mine

The Stepovich-Cleary Hill Mine is a tungsten 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: Stepovich-Cleary Hill Mine

Commodity

Primary: Tungsten
Tertiary: Beryllium
Tertiary: Antimony
Tertiary: Molybdenum

Location

State: Alaska
District: Fairbanks

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Year First Production: 1915
Year Last Production: 1944
Discovery Year: 1915
Years of Production:
Organization:
Significant: N
Deposit Size: S

Physiography

Not available

Mineral Deposit Model

Not available

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Scheelite
Ore: Stibnite
Ore: Molybdenite

Comments

Comment (Deposit): DEPOSIT AT EASTERN END OF MASS OF PORPHYRITIC GRANITE. ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT

Comment (Geology): 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.

Comment (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.

Comment (Workings): ABOUT 2,000 FT. OF UNDERGROUND WORKINGS. WORKINGS CAVED

Comment (Location): 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).

Comment (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.

References

Reference (Deposit): USGS MF-410 (D-1) LOC. 32

Reference (Deposit): USGS BULL 1024-I, P. 183, 188-198.

Reference (Deposit): USBM RI 4174, P. 4, 6-12.

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