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Overton Mine

Past Producer in Clark county in Nevada, United States with commodity Magnesite
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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. Reserves and resources
  16. Workings at the site
  17. Links to other databases
  18. Bibliographic references
  19. General comments
  20. Reporter information

Geologic information

Identification information

Deposit ID 10221960
MRDS ID I002004
MAS/MILS ID 0320030011
Record type Site
Current site name Overton Mine
Alternate or previous names Overton Ridge Magnesite Deposits
Related records 10023809

Geographic coordinates

Point of reference Pit
Geographic coordinates: -114.47862, 36.49999 (WGS84)
Elevation 487
Location accuracy 500(meters)

Site location context

Political divisions (FIPS codes)

Clark(county)

Nevada(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Valley of Fire East(quadrangle 1:24,000 scale)

Lake Mead(quadrangle 1:100,000 scale)

Las Vegas(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Muddy(hydrologic unit)

Lower Colorado-Lake Mead(hydrologic accounting unit)

Lower Colorado-Lake Mead(hydrologic subregion)

Lower Colorado(hydrologic region)

Federal lands

ST(Federal land areas administered by ST)

Geographic areas

Country State County
United States Nevada Clark

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 016 S 067 E 34 N2 Nevada

Commodities

Commodity Importance
Magnesite Primary

Materials information

Materials Type of material
Dolomite Unknown
Feldspar Unknown
Magnesite Unknown
Plagioclase Unknown
Quartz Unknown

Nearby scientific data

Pit (1) -114.47862, 36.49999
ListMap

Economic information

Ore body information

  • Strike N20W
    Dip 34E
    Thickness 90M
    Length 3000M
    Width 18M
    Depth to top 12M
    Field Value
    MAS Matrix # 1
    MAS Column # 1
    Type of Orebody #1 SEDIMENTARY
    Shape of Orebody #1 TABULAR
    Primary mode of Origin SEDIMENTATION
    Primary Ore Control BEDDING
    Degree of Wallrock Alter. MODERATE
    Type of Wallrock Alter. #1 CARBONATE SILIC
    Type of Wallrock Alter. #2 DOLOMITIZATION
    Type of Wallrock Alter. #3 CARBONITIZATION
    Strike And Dip N20W:34E
    Minimum Depth to Top 9
    Avg. Thick. Unconsol. Mat. 12
    Min. Thick. Unconsol. Mat. 9
    Date of Last Modification 850819
  • Area 450HA
    Field Value
    Total Surface Area (HA) 450
    Date of Last Modification 910418

Economic information about the deposit and operations

Operation type Surface
Development status Past Producer
Commodity type Metallic
Deposit size Medium
Significant Yes
Discovery year 1915

Mining district

District name Overton

Mineral rights holdings

Type of mineral rights Unknown

Land status

Ownership category BLM Administrative Area

Ownership information

  • Type Owner
    Owner Gentry, Laura
    Interest 100
    Home office Las Vegas, Nv
    Year 1983

Comments on the ownership information

  • OPERATOR: STANDARD SLAG CO.

Comments on the production information

  • DATA NOT AVAILABLE FOR PAST PRODUCTION: NO MILL

Reserves and resources

  • Type In-situ
    Estimate year 1936
    Total resources 771000mt ore
    Commodity Subtype Grade units Group Importance Year
    Magnesite MgO 38 wt-pct Magnesium Major 1936
  • Type In-situ
    Estimate year 1936
    Total resources 3360000mt ore
    Commodity Subtype Grade units Group Importance Year
    Magnesite MgO 34 wt-pct Magnesium Major 1936
  • Type In-situ
    Estimate year 1936
    Total resources 4630000mt ore
    Commodity Subtype Grade units Group Importance Year
    Magnesite MgO 30 wt-pct Magnesium Major 1936

Workings at the site

  • Type of workings Surface
    Area 450HA
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method PROPOSED
    Mining Method OPEN PIT
    Swell Factor .65
    Percent Waste Rock 75
    Avg. Overburden Thickness 3
    Primary Material Cover SAND, SILT
    Hardness of Ore M-HARD ROCKS
    Avg. Bench Height (meters) 12
    Max. Pit Slope (degrees) 45
    Capacity 2500
    Capacity Units MT ORE/DAY
    Unit Production Cost 4.46
    Units of Production $/MT ORE
    Operating Days per Year 260
    Operating Shifts per Day 1
    Year of Information 1983

Reference information

Bibliographic references

  • Reserve-Resource

    266. HEWETT, D. F., E. CALLAGHAN, B. N. MOORE, T. B.

  • Reserve-Resource

    NOLAN, W. W. RUBEY, AND W. T. SCHALLER. MINERAL RESOURCES

  • Reserve-Resource

    OF THE REGION AROUND BOULDER DAM. U.S. GEOL. SURV.

  • Reserve-Resource

    BULL. 871, 1936, 197 PP.

  • Deposit

    LONGWELL, C. R., E. H. PAMPEYAN, B. BOWYER, AND R. J.

  • Deposit

    ROBERTS, 1965, GEOLOGY AND MINERAL DEPOSITS OF CLARK CO,

  • Deposit

    NEVADA: NV BUR MINES AND GEOL. BULL.62, P.204

  • Deposit

    BULL.871, P.119-141

  • Deposit

    NEV. BUREAU OF MINES AND GEOL. REPORT 45, 1989, P. 10.

General comments

Subject category Comment text
Deposit GENERAL LOCATION: ABOUT 20 KM SE OF MOAPA. GENERAL SIZE OF ORE BODY: MEDIUM

Reporter information

Type Date Name Affiliation Comment
Reporter 06-MAR-95 Spear, James M. U.S. Bureau of Mines

Beyond USGS

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

Maps centered on this site

Authoritative Nevada resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.