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Iron Mountain

Past Producer in St. Francois county in Missouri, United States with commodity 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. Alteration
  9. Host and associated rocks
  10. Nearby scientific data
  11. Geologic structures
  12. Ore body information
  13. Economic information about the deposit and operations
  14. Ownership information
  15. Production statistics
  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 10072189
MRDS ID W016789
Record type Site
Current site name Iron Mountain

Geographic coordinates

Geographic coordinates: -90.63481, 37.70506 (WGS84)
Elevation 331

Site location context

Political divisions (FIPS codes)

St. Francois(county)

Missouri(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Graniteville(quadrangle 1:24,000 scale)

Farmington(quadrangle 1:100,000 scale)

Rolla(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper St. Francis(hydrologic unit)

St. Francis(hydrologic accounting unit)

Lower Mississippi-St. Francis(hydrologic subregion)

Lower Mississippi(hydrologic region)

Geographic areas

Country State County
United States Missouri St. Francois

Public Land Survey System information

Meridian Township Range Section Fraction State
5th Principal 035N 004E 31 N2 Missouri

Commodities

Commodity Importance
Iron Primary

Materials information

Materials Type of material
Magnetite Ore
Martite Ore
Actinolite Gangue
Andradite Gangue
Apatite Gangue
Barite Gangue
Bornite Gangue
Calcite Gangue
Chalcopyrite Gangue
Chlorite Gangue
Dolomite Gangue
Epidote Gangue
Fluorite Gangue
Galena Gangue
Pyrite Gangue
Pyroxene Gangue
Quartz Gangue
Sericite Gangue
Tremolite Gangue

Alteration

  • (Local) Rocks On The Upper Portion Of Big Mountain Exhibit Everywhere The Effects Of Extreme Alteration. Wall Rocks Are Altered To Chlorite, Epidote And Sericite.

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Late Cambrian
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Conglomerate
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite
    Rock unit name Andesite Porphyry
    Rock description Andesite Porphyry

Nearby scientific data

(1) -90.63481, 37.70506
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description St. Francois Mountains, Ozark Dome.
Type of structure Local
Structure description Many Near-Vertical Strike-Slip Faults Intersect The Ore Body, But Most Have Displacements Less Than A Foot. Faults Are Especially Common Along The Late Andesite Dikes With Movement Both Preceding And Following The Intrusion. All The Faults Are Precambrian. Two Sets Of Joints That Strike Ne And Nw Are The Most Common. Dips Are 82 Deg Nw And 87 Deg Ne Respectively.

Ore body information

  • General form ONE OF THE MAIN ORE BODIES IS CRUDELY DOME SHAPED, THE OTHER IS AN ELONGATED LENSE IN PLAN BUT HOOK-SHAPED IN CROSS SECTION
    Width 61M
    Depth to top 9M
    Depth to bottom 152M

Comments on the geologic information

  • TWO EPOCHS OF MINERALIZATION, HEMATITE, MAGNETITE, AMPHIBOLE, AND APATITE WERE DEPOSITED FIRST. IN THE SECOND EPOCH, THERE WAS EXTENSIVE REPLACEMENT OF ANDESITE AND THE NONMETALLIC CONSTITUENTS OF THE ORE BY CALCITE, QUARTZ AND GARNET (STEIDTMANN, 1933 ).

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Year of first production 1845

Ownership information

  • Type Owner
    Owner M. A. Hanna Co. Acquired Iron Mountain In 1927.

Production statistics

  • Year 1892
    Material ORE
    Accuracy Accurate
    Description Ap_Grade: ^63.21 % Fe, 5.8 % Silica, 0.84 % Phos.
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Ore Phosphorus-Phosphates Phosphorus 1wt-pct
    SIL Silica Silica 6wt-pct
    Ore Iron Iron 63wt-pct

Comments on the production information

  • GRADE INCLUDES A MIXTURE OF CONGLOMERATE, VEINS AND BOULDER ORE, AVERAGED.

Workings at the site

  • Type of workings Surface/Underground
    Overall depth 122M
    Overall length 822.96M
    Overall width 300M

Comments on the workings information

  • LENGTH AND WIDTH OF MINED AREA IS FOR ALL THREE ORE TYPES ON PROPERTY. PROPERTY CONTAINS 3 OPEN CUTS AND 2 UNDERGROUND MINES.

Comments on development

  • ECON.COM: MILL CAPACITY IS 500 TONS OF CRUDE ORE PER SHIFT ( 1933 ).

Reference information

Bibliographic references

  • Analytical Data

    SRC.REF: LAKE, M.C., 1933 , 16 TH INT. GEOL. CONG. GUIDEBOOK 2 , P. 64.

  • Deposit

    CRANE, G.W., 1912 , THE IRON ORES OF MISSOURI: MO. BUREAU OF MINES AND GEOL., 2D SER., V. 10 , P. 108 - 120 .

  • Deposit

    MURPHY, JOHN E., AND OHLE, ERNEST L., 1968 , THE IRON MOUNTAIN MINE, IRON MOUNTAIN, MISSOURI, IN: RIDGE, J.D., ORE DEPOSITS OF THE UNITED STATES, 1933 - 1967 (GRATON-SALES VOLUME): NEW YORK, AM. INST. MINING, METALL. PETROLEUM ENGINEERS, V. 1 , P. 288 - 302.

  • Deposit

    LAKE, M.C. 1933 , THE IRON-ORE DEPOSITS OF IRON MOUNTAIN, MISSOURI, IN: 16TH INT. GEOL. CONG. GUIDEBOOK 2 , P. 56 - 67

  • Deposit

    WINSLOW, ARTHUR, HAWORTH, E., NASON, F., 1894 , A REPORT ON THE IRON MOUNTAIN SHEET INCLUDING PORTIONS OF IRON, ST. FRANCOIS AND MADISON COUNTIES: MO. GEOL. SURV., 1 SERV., V. 9 , SHEET REPORT NO. 3 , P. 56 - 61.

  • Deposit

    1910 DIREXPL 3 HOLES INDICATE A CONSIDERABLE THICKNESS OF CONGLOMERATE ORE. 50 FT AND 8 IN OF SOLID VEIN ORE ISENCOUNTERED IN ONE HOLE.

  • Deposit

    DIREXPL OLD IRON MOUNTAIN COMPANY DRILLED 3 HOLES IN THE FOOT WALL OF THE BIG PIT AT LITTLE MOUNTAIN AND CUT CONSIDERABLE ORE.

  • Production

    CRANE, G.W., 1912 , THE IRON ORES OF MISSOURI: MO. BUREAU OF MINES AND GEOL., 20 SER., V. 10 , P. 108.

General comments

Subject category Comment text
Deposit BOULDER ORE IS SPECULAR HEMATITE ; INFO.SRC : 1 PUB LIT
Deposit WORKABLE ORE OCCURS AT 3 DISTINCT GEOLOGIC HORIZONS: 1. BOULDER ORE EMBEDDED IN THE SURFACE CLAY; 2. VEIN ORE IN THE PORPHYRY; 3. CONGLOMERATE ORE OCCURRING IN BEDS BETWEEN THE PORPHYRY AND THE OVERLYING CAMBRIAN SEDIMENTS. VEIN ORE INCLUDES BRECCIA ORES. WIDTH AND BOTTOM FIGURES ARE FOR VEIN ORE. AT THE OPEN CUT AT LITTLE MOUNTAIN, THERE OCCURRED A 30 TO 40 FT. VEIN OF SOLID ORE, DIPPING ABOUT 40 DEG SW, EXTENDING 360 FT. DOWN DIP AND 420 FT. ALONG STRIKE. WORKING CEASED AT IRON MOUNTAIN IN 1966 . BEDS OF BOULDER ORE ARE FOUND EXCLUSIVELY ON THE EASTERN SLOPE OF BIG MT. ( NASON, 1896 ).

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JAN-1976 Weeks, Robert U.S. Geological Survey

Beyond USGS

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

Current status (per MSHA)

StatusActive since 04/09/2010
MSHA mine ID2300210
Mine name (MSHA)Iron Mountain Quarry
Current operatorMartin Marietta Materials, Inc.
Current controller (parent)Martin Marietta Materials Inc
Mine typeSurface (Metal / non-metal)

Inferred by coordinate + name similarity (1189 m, 1.00 match). Confirm against MSHA if precision matters — non-USGS-curated cross-references may occasionally point at a neighbouring mine.

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