1. Mineral Resources
  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

Stepovich-Cleary Hill Mine

Past Producer in Alaska, United States with commodities Tungsten, Antimony, Beryllium, Molybdenum
Map
XML
JSON
KML
C

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
(click for info)

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 Primary
Antimony Tertiary
Beryllium 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

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

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

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A015304

Bibliographic references

  • Deposit

    USGS MF-410 (D-1) LOC. 32

  • Deposit

    USGS BULL 1024-I, P. 183, 188-198.

  • Deposit

    USBM RI 4174, P. 4, 6-12.

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.