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Pea Ridge

Producer in Washington county in Missouri, United States with commodities Iron, Phosphorus-Phosphates
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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. Alteration
  9. Mineral occurrence model information
  10. Host and associated rocks
  11. Nearby scientific data
  12. Geologic structures
  13. Ore body information
  14. Economic information about the deposit and operations
  15. Mining district
  16. Ownership information
  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 10090126
MRDS ID D008175
Record type Site
Current site name Pea Ridge
Alternate or previous names Sullivan
Related records 10269533

Geographic coordinates

Geographic coordinates: -91.04652, 38.12676 (WGS84)
Elevation 274
Location accuracy 1000(meters)
Relative position APPROXIMATELY 8.25 MI SOUTHEAST OF SULLIVAN AND 10.25, 0.5 Mi

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 039N 001W 4.9 Missouri

Comments on the location information

  • MI EAST SOUTHEAST OF BOURBON. LONGITUDE AND LATITUDE ARE APPROXIMATE.

Commodities

Commodity Importance
Iron Primary
Phosphorus-Phosphates Secondary

Comments on the commodity information

  • MAGNETITE AVERAGES 55% IRON

Materials information

Materials Type of material
Apatite Ore
Hematite Ore
Magnetite Ore
Barite Gangue
Calcite Gangue
Fluorite Gangue
Pyrite Gangue
Quartz Gangue

Alteration

  • (Local) Sericite, When Found, Occupies The Position Normally Occupied By Quartz. It Appears That Late-Stage Hydrothermal Activity With Excess Available Oxygen Could Explain The Genesis Of The Massive Hematite.

Analytical data

Result APPROXIMATELY 68% IRON AND LESS THAN 2% SILICA.

Mineral occurrence model information

Model code 158
USGS model code 25i
Deposit model name Volcanic-hosted magnetite

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Neoproterozoic
  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite

Nearby scientific data

(1) -91.04652, 38.12676
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description A Major Fault Striking N 80 Deg W And Dipping 45 Deg Ne
Type of structure Local
Structure description 2 Sets Of Magic Dikes, One Striking N 60 Deg E And The Other N 85 Deg E, Aplitic Dikes N 25 Deg W

Ore body information

  • General form CRET-SHAPED TABULAR MASS, LENTICULAR MASSES
    Strike N 60 DEG E
    Dip NEARLY VERTICAL
    Thickness 182.88M
    Length 804.65M
    Depth to top 396.24M
    Depth to bottom 1005.84M

Comments on the geologic information

  • THE DEPOSIT IS COMPOSED OF FIVE DISTINCT ZONES; MAGNETITE 90 NE, SPECULAR-HEMATITE ZONE, PORPHYRY BRECCIA ZONE, QUARTZ-AMPHIBOLE ZONE AND FOOTWALL QUARTZ-HEMATITE ZONE. BRECCIATED FRESH PORPHYRY ON THE HANGING WALL SIDE OF THE ORE MASS IS CEMENTED BY MAGNETITE AND SPECULAR HEMATITE ASSAYING ABOUT 35% IRON. THE FOOTWALLSIDE CONSISTS OF A VERY FINE INTERGROWTH OF QUARTZ AND SPECULAR HEMATITE, THE HANGING WALL IS SKARN AND OCCUPIES WIDTHS UP TO 200 FT. THE RHYOLITE REMAINS FRESH AND UNALTERED EXCEPT WHERE IN CONTACT WITH THE SERICITIZED ZONES AT THE ORE CONTACT. THE ORE DEPOSIT IS INTERPRETED AS HAVING BEEN FORMED ESSENTIALLY BY A SINGLE INJECTION OF A MAGMATIC DIFFERENTIATE WITH HYDROTHELMAL END PHASES FORMING THE QUARTZ-AMPHIBOLE AND QUARTZ-HEMATITE PORTIONS OF THE DEPOSIT.

Economic information about the deposit and operations

Development status Producer
Commodity type Both
Deposit size Large
Significant No
Discovery year 1954
Discoverer St Joseph Lead Co.
Year of first production 1964

Mining district

District name Steelville District

Ownership information

  • Type Owner-Operator
    Owner St. Joseph Minerals

Comments on the production information

  • HAS A CAPACITY OF ABOUT 2 MILLION TONS PER YEAR OF PREMIUM 68% IRON ORE PELLETS,AND OPERATED NEARLY AT CAPACITY DURING 1966 TO 1967. PELLETS NORMALLY PRODUCED AARE PLUS 3/8 INCH MINUS 1/2 INCH, HIGH IRON (APPROX. 68% FE), LOW SILICA (LESS THAN 2%).

Comments on the reserve resource information

  • ORE RESERVES ARE REPORTED TO EXCEED 100 MILLION LONG TONS, SUFFICIENT FOR A 50 YEAR PRODUCTIVE LIFE AT PRESENT 2 MILLION TPY OUTPUT RATE CHAYWARD AND OTHERS, 1969)

Workings at the site

  • Type of workings Unknown
    Overall depth 763.52M

Comments on the workings information

  • THE OREBODY IS DEVELOPED THROUGH TWO CONCRETE-LINED CIRCULAR SHAFTS, EACH 19 FT 1 IN, INSIDE DIAMETERE. A 26 MILE SPUR WAS CONSTRUCTED TO CONNECT PEA RIDGE WITH THE MAIN LINE OF THE MISSOURI PACIFIC RAILROAD AT CADET IN WASHINGTON COUNTY.

Comments on development

  • THE PEA RIDGE DEPOSIT WAS LARGELY DISCOVERED THROUGH THE AGENCY OF MAGNETIC SURVEYS. THE MERAMEC MINING CO. (PARTNERSHIP BETWEEN ST JOE AND BETHLEHAM STEEL CORP) WAS THE OWNER UNTIL 1978.

Reference information

Bibliographic references

  • Deposit

    HAYES, W.C. AND GUILD P.W., 1967, IRON, MINERAL AND WATER RESOURCES OF MISSOURI, VOL XLIII, SECOND SERIES, P. 74-87

  • Deposit

    MINERALS IN THE ECONOMY OF MISSOURI, 1979, BUREAU OF MINES, U.S. DEPARTMENT OF THE INTERIOR, P. 5-6

  • Deposit

    WHARTON, H.M. AND OTHERS, DEC 1969, MISSOURI MINERALS, MISSOURI GEOLOGICAL SURVEY AND WATER RESOURCES, ROLLA, MISSOURI P. 51-57 AND P. 223-226.

  • Deposit

    MERAMAC IRON ORE PROJECT STARTS PRODUCTION AT PEA RIDGE, ENGINEERING AND MINING JOURNAL, APRIL 1964 P. 93-108

  • Deposit

    EMERY, J.A., GEOLOGY OF THE PEA RIDGE IRON ORE BODY, ORE DEPOSITS OF THE U.S., 1933-1967, VOL 1, P. 359-369.

  • Production

    STATISTICAL REPORT, MISSOURI DEPARTMENT, DIVISION OF STANDARD INSPECTION LABOR MINES

General comments

Subject category Comment text
Deposit IN MID-1979 ST. JOE LEAD CO. REOPENED THE MINE, WHICH HAD BEEN CLOSED SINCE DECEMBER 1979 WHILE SHUT DOWN, ESSENTIAL MAINTENANCE WAS PERFORMED AND STOCKPILES PARTIAL CAPACITY OF A MILLION TONS PER YEAR. ; INFO.SRC : 1 PUB LIT
Deposit THE OREBODY TRANSECTS THE ENCLOSING RHYOLITE AND RHYOLITE PORPHYRY FLOWS AT AN EXTREMELY SHARP ANGLE.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUL-81 Dulin, Lise, A. (Orris, Greta J.) U.S. Geological Survey

Beyond USGS

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

External references

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