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Bald Mountain Thorium-Rare Earth Deposit

Past Producer in Sheridan county in Wyoming, United States with commodities Titanium, Thorium, REE, Gold, Zirconium, Iron
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Public Land Survey System information
  6. Commodities
  7. Materials information
  8. Nearby scientific data
  9. Ore body information
  10. Economic information about the deposit and operations
  11. Mining district
  12. Mineral rights holdings
  13. Land status
  14. Ownership information
  15. Production statistics
  16. Reserves and resources
  17. Workings at the site
  18. Links to other databases
  19. Bibliographic references
  20. General comments
  21. Reporter information

Geologic information

Identification information

Deposit ID 10230147
MAS/MILS ID 0560330016
Record type Deposit
Current site name Bald Mountain Thorium-Rare Earth Deposit
Alternate or previous names Bald Mtn Thorium-Rare Earth Deposit, Bald Mtn Monazite Deposit

Geographic coordinates

Point of reference Ore Body
Geographic coordinates: -107.79851, 44.81163 (WGS84)
Elevation 2682
Location accuracy 100(meters)

Site location context

Political divisions (FIPS codes)

Sheridan(county)

Wyoming(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Bald Mountain(quadrangle 1:24,000 scale)

Burgess Junction(quadrangle 1:100,000 scale)

Sheridan(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Little Bighorn(hydrologic unit)

Big Horn(hydrologic accounting unit)

Big Horn(hydrologic subregion)

Missouri(hydrologic region)

Federal lands

Bighorn National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States Wyoming Sheridan

Public Land Survey System information

Meridian Township Range Section Fraction State
6th Principal 056 N 091 W 22 S2 Wyoming

Commodities

Commodity Importance
Titanium Critical Primary
Thorium Primary
REE Critical Primary
Gold Secondary
Zirconium Critical Tertiary
Iron Tertiary

Materials information

Materials Type of material
Monazite Ore
Garnet Unknown
Hematite Unknown
Ilmenite Unknown
Limonite Unknown
Magnetite Unknown
Microcline Unknown
Orthoclase Unknown
Plagioclase Unknown
Quartz Unknown
Zircon Unknown

Nearby scientific data

Ore Body (1) -107.79851, 44.81163
ListMap

Economic information

Ore body information

  • Thickness 6.7M
    Length 3000M
    Width 762M
    Depth to top 0M
    Field Value
    MAS Matrix # 1
    MAS Column # 1
    Type of Orebody #1 SEDIMENTARY
    Shape of Orebody #1 TABULAR
    Shape of Orebody #2 IRREGULAR
    Primary mode of Origin UNKNOWN
    Primary Ore Control BEDDING
    Secondary Ore Control LITHOLOGY
    Degree of Wallrock Alter. UNKNOWN
    Type of Wallrock Alter. #1 UNKNOWN
    Minimum Depth to Top 0
    Avg. Thick. Unconsol. Mat. 0
    Min. Thick. Unconsol. Mat. 0
    Date of Last Modification 830419
  • Area 430HA
    Field Value
    Total Surface Area (HA) 430
    Date of Last Modification 910418

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Significant Yes
Mining method Open Pit
Milling method Gravity

Mining district

District name Big Horn District

Mineral rights holdings

Type of mineral rights Located Claim

Land status

Ownership category National Forest

Ownership information

  • Type Owner
    Owner Dr. Scott Nickerson
    Interest 100
    Home office Wyoming
    Year 1982

Production statistics

  • Year 1903
    Description Unknown Amount Of Au Conc Was Produced

Reserves and resources

  • Type In-situ
    Estimate year 1962
    Measured 18144000mt ore
    Indicated 18144000mt ore
    Demonstrated 36288000mt ore
    Inferred 18144000mt ore
    Total resources 54432000mt ore
    Commodity Subtype Grade units Group Importance Year
    REE Ce Group 0.079 wt-pct REE Trace 1962
    Thorium ThO2 0.011 wt-pct Thorium Major 1962

Comments on the reserve resource information

  • UNLIKELY TO BE WORKED BECAUSE OF LOW GRADE
  • THE RESERVES AND GRADES IN Q-MATRIX 1 COL 1 WERE USED FOR THIS EVALUATION. THE RESERVES AND GRADES SHOWN IN COL 2 ARE A HIGH GRADE ZONE WITHIN THE RESERVES OF COL 1. THE RARE EARTH OXIDE GRADE WAS CALCULATED FROM DATA PROVIDED IN U.S. BUMINES RI-5917, PP. 2-3. THE SAMPLES USED TO DERIVE THESE DATA CONTAIN A DISPROPORTIONATE AMOUNT OF THE HIGH GRADE STRATUM. CONSEQUENTLY, THE RARE EARTH GRADE IS SOMEWHAT ABOVE AVERAGE GRADE. THIS GRADE WAS NOT USED TO CALCULATE CONCENTRATE OUTPUT OR OTHER DATA OF THE MATERIALS BALANCE.
  • REO (RARE EARTH OXIDE)

Workings at the site

  • Type of workings Surface
    Area 300HA
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method PROPOSED
    Mining Method OPEN PIT
    Swell Factor .6
    Percent Waste Rock 0
    Avg. Overburden Thickness 0
    Hardness of Ore SAND, GRAVEL
    Avg. Bench Height (meters) 6.7
    Max. Pit Slope (degrees) 90
    Capacity 3810
    Capacity Units MT ORE/DAY
    Preprod. Stripping Vol. 0
    Unit Production Cost 2.31
    Units of Production $/MT ORE
    Operating Days per Year 342
    Operating Shifts per Day 2
    Year of Information 1982

Comments on other economic factors

  • THE PIT SURFACE AREA INCLUDES THE MAJOR EXCAVATION ALONG THE SOUTH SLOPE OF ROOSTER KNOB AND A SMALL PIT LOCATED 4 KM TO THE SOUTHEAST. SEE LOCATION MAP OF REPORT. PIT DIMENSIONS WERE ESTIMATED FROM THE LIMITS OF THE CONGLOMERATE(OREBODY) AND DRILL HOLE LOCATIONS SHOWN IN RME-3128, P. 40. ACTUAL SURFACE DIMENSIONS ARE APT TO BE SMALLER. PIT DEPTH WILL AVERAGE 6.7 METERS AND ALL MATERIAL WILL BE TAKEN AS ORE; THE ORE GRADES INCLUDE DILUTION BY LEAN ORE AND OVERBURDEN. BECAUSE OF THE SHALLOW DEPTH OF THE PIT, ONLY ONE BENCH WILL BE REQUIRED, AND A PIT WALL OF 90 DEGREES WILL PROBABLY BE MAINTAINED.

Reference information

Bibliographic references

  • Geology

    MCKINNEY, A.A. H.W. HORST. DEADWOOD CONGLOMERATE MONAZITE DEPOSIT BALD MOUNTAIN AREA, SHERIDAN AND BIG HORN COUNTIES, WYOMING, RME-3128, USAEC, USBM, MARCH 1953.

  • Deposit

    Wilson, W.H., 1966, Mineral Resource of Wyoming: Geological Survey of Wyoming Bulletin 50, p. 220.

  • Production

    KELLY, F.J. TECHNOLOGICAL AND ECONOMIC PROBLEMS OF RARE-EARTH METAL AND THORIUM RESOURCES IN COLORADO, NEW MEXICO, AND WYOMING, USBM IC-8124, 1962, PP. 5-10, 25-31.

  • Production

    SHANNON S.S. MONAZITE AND RELATED MINERALS, INDUSTRIAL MINERALS AND ROCKS, 4TH EDITION, AIME, 1975, PP. 851-859.

  • Geology

    WILSON, W.H. RADIOACTIVE MINERAL DEPOSITS OF WYOMING, GEOLOGICAL SURVEY OF WYOMING, USBM RI-NO. 7, P. 7.

  • Ownership

    COSGROVE, D. PERSONAL COMMUNICATION, JAN. 1983 WITH MAS EVALUATOR.

  • Ownership

    NICKERSON, S. DR. CLAIMS HOLDER, PERSONAL COMMUNICATION, JAN. 1983.

  • Reserve-Resource

    BORROWMAN, S.R. J.B. ROSENBAUM, RECOVERY OF THORIUM FROM A WYOMING ORE, USBM RI-5917 PP. 1-8.

General comments

Subject category Comment text
Deposit from deleted record 560030161 = 10229770:
LOCATED IN THE BASAL CONGLOMERATE OF THE DEADWOOD FM OF MIDDLE CAMBRIAN AGE. THICKNESS VARIES BETWEEN 2.5 TO 10 FT.
MICROSCOPIC ANALYSIS: ILMENITE 38.3%, MONAZITE 8.7%, MAGNETITE 4.0%, ZIRCON 2%, IMPURITIES 48.8%. AVG THO2= 8.8%. AVG GOLD 0.003 OZ PER TON.

Reporter information

Type Date Name Affiliation Comment
Reporter 02-MAR-95 Dolzani, Roger L. U.S. Bureau of Mines
Reporter 01-DEC-83 South Dakota School of Mines U.S. Bureau of Mines
Editor 08-DEC-09 Wilson, Anna B. U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

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