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Pea Ridge Mine

Producer in Washington county in Missouri, United States with commodities Cobalt, Iron, Phosphorus-Phosphates, REE
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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. Mineral rights holdings
  12. Land status
  13. Ownership information
  14. Production statistics
  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 10269533
MRDS ID D008175
MAS/MILS ID 0292210020
Record type Site
Current site name Pea Ridge Mine
Related records 10090126

Geographic coordinates

Point of reference Plant
Geographic coordinates: -91.04652, 38.12676 (WGS84)
Elevation 281
Location accuracy 100(meters)

Site location context

Political divisions (FIPS codes)

Washington(county)

Missouri(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Meramec State Park(quadrangle 1:24,000 scale)

Sullivan(quadrangle 1:100,000 scale)

Saint Louis(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Meramec(hydrologic unit)

Upper Mississippi-Meramec(hydrologic accounting unit)

Upper Mississippi-Kaskaskia-Meramec(hydrologic subregion)

Upper Mississippi(hydrologic region)

Geographic areas

Country State County
United States Missouri Washington

Public Land Survey System information

Meridian Township Range Section Fraction State
5th Principal 039 N 001 W 04 NWSW Missouri

Commodities

Commodity Importance
Cobalt Critical Tertiary
Iron Primary
Phosphorus-Phosphates Tertiary
REE Critical Tertiary

Materials information

Materials Type of material
Apatite Unknown
Hematite Unknown
Magnetite Unknown
Pyrite Unknown

Nearby scientific data

Plant (1) -91.04652, 38.12676
ListMap

Economic information

Ore body information

  • Strike N60E
    Dip 80S
    Length 793M
    Width 183M
    Depth to top 397M
    Field Value
    MAS Matrix # 1
    MAS Column # 1
    Type of Orebody #1 OTHER
    Shape of Orebody #1 TABULAR
    Shape of Orebody #2 OTHER
    Primary mode of Origin MAGMATIC DIFFER
    Secondary mode of Origin HYDROTHERMAL
    Primary Ore Control IGNEOUS
    Degree of Wallrock Alter. SLIGHT
    Type of Wallrock Alter. #1 SERICITIC
    Strike And Dip N60E:80S
    Minimum Depth to Top 397
    Date of Last Modification 801106
  • Area 81HA
    Field Value
    Total Surface Area (HA) 81
    Date of Last Modification 910418

Economic information about the deposit and operations

Operation type Underground
Development status Producer
Commodity type Both
Deposit size Large
Significant Yes
Discovery year 1953
Year of first production 1964

Mineral rights holdings

Type of mineral rights Private Lease
Type of mineral rights Fee Ownership
Type of mineral rights State Lease

Land status

Ownership category Private

Ownership information

  • Type Operator
    Owner Pea Ridge Iron Ore Co.
    ID 2300454
    Home office Missouri
    Year 1994
  • Type Owner
    Owner Big River Minerals Corp.
    ID 2300454
    Interest 100
    Home office Missouri
    Year 1994

Production statistics

  • Year 1964
    Description Iron Pellets

Comments on the production information

  • PA IS IRON CONCENTRATE. PB IS PHOSPHATE CONCENTRATE. PC IS COBALT CONCENTRATE AND ASSUMED TO BE SOLD F.O.B. PD IS IRON PELLETS AND PE IS THE COBALT PRODUCT. BOTH PRODUCTS ARE ASSUMED TO BE SOLD F.O.B. INPUT CAPACITY FOR PD AND PE IS TERMS OF PYRITE/COBALT CONCENTRATE.

Reserves and resources

  • Type In-situ
    Estimate year 1994
    Measured 163000000mt ore
    Demonstrated 163000000mt ore
    Total resources 163000000mt ore
    Commodity Subtype Grade units Group Importance Year
    REE REE 0.5 wt-pct REE Trace 1994
    Iron Fe 55 wt-pct Iron Major 1994

Comments on the reserve resource information

  • THE P 25 AND P 10 LEVELS WERE INCREASED BY 30 PERCENT ABOVE THE P 50 LEVEL BECAUSE LITERATURE INDICATES THAT THE BOTTOM OF THE ORE BODY HAS NOT YET BEEN DETERMINED.
  • OWNER: BIG RIVER MINERALS CORP (1990) OPERATOR: PEA RIDGE IRON ORE CO. REO IN IRON ORE = 0.5%.
  • REO ALSO OCCURS IN 4 BRECCIA PIPES = 2 MILLION MT AT 12%

Workings at the site

  • Type of workings Underground
    Length 18000M
    Overall depth 763M
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method ESTIMATE
    Mining Method OTHER CAVING METHODS
    Swell Factor .65
    Percent Waste Rock 0
    Percent Recovery 90
    Hardness of Rock HARDROCK WITH LITTLE WATER
    Rock Characteristics MULTIPLE SYSTEMS OF WEAKNESS PLANES
    Rock Support Chars. SUPPORTING
    Mine Support Chars. UNKNOWN
    Number of Shafts 2
    1st Condition of Workings OPEN
    2nd Condition of Workings PART ACCESSIBLE
    Capacity 5120
    Capacity Units MT ORE/DAY
    Unit Production Cost 3.79
    Units of Production $/MT ORE
    Operating Days per Year 254
    Operating Shifts per Day 2
    Year of Information 1979
  • Type of workings Underground
    Length 18000M
    Overall depth 763M
    Field Value
    MAS Development Schedule # 1
    Mining Record # 2
    Status of Mining Method ESTIMATE
    Mining Method SUBLEVEL 10-43
    Swell Factor .65
    Percent Waste Rock 0
    Percent Recovery 85
    Hardness of Rock HARDROCK WITH LITTLE WATER
    Rock Characteristics MULTIPLE SYSTEMS OF WEAKNESS PLANES
    Rock Support Chars. SUPPORTING
    Mine Support Chars. UNKNOWN
    Number of Shafts 2
    1st Condition of Workings OPEN
    2nd Condition of Workings PART ACCESSIBLE
    Capacity 1280
    Capacity Units MT ORE/DAY
    Unit Production Cost 5.76
    Units of Production $/MT ORE
    Operating Days per Year 254
    Operating Shifts per Day 2
    Year of Information 1979

Comments on other economic factors

  • THREE TYPES OF MINING METHODS ARE USED AT PEA RIDGE. CURRENTLY PILLAR ROBBING (CAVING) ACCOUNTS FOR 80-PERCENT OF MINED ORE AND THE SUBLEVEL MINING METHODS ACCOUNT FOR 20-PERCENT. PEA RIDGE USES SUBLEVEL CAVING AND SUBLEVEL STOPING. THE U1 DATA SET CONTAINS 80-PERCENT OF THE MINE CAPITAL COST AND THE U2 DATA SET CONTAINS 20-PERCENT. U1 DATA SET IS PILLAR RECOVERY MINING U2 DATA SET IS SUBLEVEL MINING ORE IS TRANSFERRED TO THE 2475 LEVEL WHERE IT IS CRUSHED AND CONVEYED TO SHAFT STATION STORAGE AREA. THE ORE IS THEN LOADED INTO SKIPS AND HOISTED TO THE SURFACE.

Reference information

Bibliographic references

  • Reserve-Resource

    ENGINEERING AND MINING JOURNAL INTERNATIONAL DIRECTORY OF

  • Reserve-Resource

    MINING, 1979, P. 195.

  • Reserve-Resource

    ST. JOE MINERALS CORPORATION, FORM 10-K ANNUAL REPORT.

  • Reserve-Resource

    RESERVES AND GRADES DERIVED FROM BOTH SOURCES.

  • Deposit

    ST. JOE MINERALS: GROWING THROUGH DIVERSIFICATION,

  • Deposit

    ENGINEERING AND MINING JOURNAL, NOVEMBER 1976, P. 69.

  • Deposit

    DEVELOPMENT, INSTALLATION, AND EFFECT OF AN UNDERGROUND

  • Deposit

    CRUSHING AND CONVEYING SYSTEM AT PEA RIDGE

  • Deposit

    TRANSACTIONS, SOCIETY OF MINING ENGINEERS, AIME, VOL. 252

  • Deposit

    DECEMBER 1972, P. 433-437.

  • Deposit

    MERAMEC'S BIG BLAST: ENGINEERING AND MINING JOURNAL,

  • Deposit

    FEBRUARY 1977, P. 51-55.

  • Deposit

    THE INSIDE STORY OF MISSOURI'S EXPLORATION BOOM - PART 1

  • Deposit

    ENGINEERING AND MINING JOURNAL, NOVEMBER 1965, P. 77.

  • Deposit

    THE INSIDE STORY OF MISSOURI'S EXPLORATION BOOM - PART 2

  • Deposit

    ENGINEERING AND MINING JOURNAL, DECEMBER 1965, P. 81.

  • Deposit

    COLLECTION, EVALUATION, AND CLASSIFICATION OF MINERAL

  • Deposit

    RESOURCES INFORMATION ON IRON, TUNGSTEN, AND MANGANESE

  • Deposit

    IN MISSOURI USBM GRANT GO 264016 BY RICHARD D. HAGNI

  • Deposit

    AND DAVID R. JESSEY.

  • Deposit

    PILLAR RECOVERY AT THE PEA RIDGE MINE, MINING ENGINEERING

  • Deposit

    SEPTEMBER 1976, PP. 35-39.

  • Deposit

    MERMAC IRON ORE PROJECT STARTS PRODUCTION AT PEA RIDGE,

  • Deposit

    ENGINEERING AND MINING JOURNAL, APRIL 1964, PP. 93-108.

  • Deposit

    GEOLOGY OF THE PEA RIDGE IRON ORE BODY BY JOHN A. EMERY,

  • Deposit

    ORE DEPOSITS IN THE UNITED STATES 1933/1967 VOL. 1

  • Deposit

    PP. 359-369, REPRINT 1970.

General comments

Subject category Comment text
Deposit CURRENT OPERATIONS UTILIZE SEVERAL MINING METHODS TO EXTRACT IRON ORE FROM AN UNDERGROUND DEPOSIT. ONLY IRON IS RECOVERED AT THIS TIME,BUT THE MILL HAS THE CAPABILITY OF RECOVERING APATITE (P205) AND PYRITE CONCENTRATES. DATABASE SHOWS P205 RECOVERY AND PROPOSED CIRCUIT (K3) TO RECOVER COBALT FROM THE PYRITE CONCENTRATE.

Reporter information

Type Date Name Affiliation Comment
Reporter 10-OCT-96 Smith, R.C. U.S. Bureau of Mines

Beyond USGS

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

Current status (per MSHA)

StatusAbandoned since 06/09/2004
MSHA mine ID2300454
Mine name (MSHA)PEA RIDGE IRON ORE CO
Current operatorPea Ridge Iron Ore Company Inc
Current controller (parent)Woodridge Resource Corp
Mine typeUnderground (Metal / non-metal)

MSHA cross-reference per the original MRDS record. Mine status and operator reflect MSHA's last published Mines export (February 2025); MSHA's public bulk feed has been unavailable since, so this may be out of date. See the Mine Data Retrieval System for current status.

Open MSHA's Mine Data Retrieval System for inspections, accidents, and violations for this mine.

External references

Maps centered on this site