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Pilot Knob

Prospect in Iron 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. Land status
  15. Ownership information
  16. Production statistics
  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 10072191
MRDS ID W016790
Record type Site
Current site name Pilot Knob

Geographic coordinates

Geographic coordinates: -90.63344, 37.61923 (WGS84)
Elevation 457
Relative position 5 MILES SOUTH AND SLIGHTLY EAST OF IRON MOUNTAIN

Site location context

Political divisions (FIPS codes)

Iron(county)

Missouri(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Ironton(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 Iron

Public Land Survey System information

Meridian Township Range Section Fraction State
5th Principal 034N 004E 29 S2 Missouri

Commodities

Commodity Importance
Iron Primary

Materials information

Materials Type of material
Magnetite Ore
Apatite Gangue
Barite Gangue
Chalcopyrite Gangue
Feldspar Gangue
Fluorite Gangue
Quartz Gangue
Tourmaline Gangue

Alteration

  • (Local) Sericitization, Silification, Hematitized

Analytical data

Result SHIPMENTS FOR SIX MONTHS IN 1885 AVERAGED 58.11 % FE, 17.02 % SILICA, 0.013 % PHOSPHORUS, 2.59 % ALUMINA, 0.077 % SULPHUR, 0.015 % LIME, AND 0.015 % MAGNESIA ( STEIDTMANN, 1933 ). RANGE: FE 66.83 % - 43.03 %, SILICA 3.62 % - 30.65 %, SULPHUR 0.07 % - 0.098 %, PHOSPHORUS 0.014 % - 0.021 % ( WINSLOW, 1894 ).

Host and associated rocks

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

Economic information

Geologic structures

Type of structure Regional
Structure description St. Francois Mountains
Type of structure Local
Structure description Footwall Porphyry Dips About 17 Degrees Sw Without Any Marked Undulations. The Beds Above The Contact Are Conformable.

Ore body information

  • General form ROUGHLY PEAR-SHAPED
    Thickness 42.67M
    Length 457.2M
    Width 274.32M
    Depth to top 0M

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1835
Year of first production 1848

Land status

Ownership category Private

Ownership information

  • Type Operator
    Owner Pilot Knob Pellet Co

Production statistics

  • Year 1933
    Period 1848 To 1933
    Material ORE
    Accuracy Estimate
    Description Cp_Grade: ^45 To 50 % Fe
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Ore Iron Iron 48wt-pct

Comments on the production information

  • GRADE IS FOR ORE WHERE HOST ROCK IS LARGELY TUFF, GRADE DECREASES AS AMOUNT OF BRECCIA INCREASES.

Workings at the site

  • Type of workings Underground
    Overall depth 416.05M
    Overall length 457.2M
    Overall width 274.32M

Comments on the workings information

  • MINING IN THE OLD WORKS CEASED IN 1890 , A NEW ORE BODY WEST OF THE BASE OF PILOT KNOB AND EXTENDING WESTWARD ACROSS THE VALLEY HAS A TARGET DATE TO BEGIN PRODUCTION IN 1968 .

Reference information

Bibliographic references

  • Deposit

    CRANE, G.W., 1912 , THE IRON ORES OF MISSOURI: MISSOURI BUREAU OF MINES AND GEOLOGY, 2D SER., V. 10 , P. 121 - 131 .

  • Deposit

    HAYES, W.C. AND GUILD, PHILIP W., 1967 , METALLIC MINERAL RESOURCES IN: MINERAL AND WATER RESOURCES OF MISSOURI, V. 43 , 2D SERIES, P. 82 - 83 .

  • Deposit

    STEIDTMANN, E., 1933 , THE IRON DEPOSITS OF PILOT KNOB, MISSOURI: 16TH INT. GEOL. CONG. GUIDEBOOK 2 , P. 68 - 73 .

  • Deposit

    WINSLOW, A., HAWORTH, E., NASON, F., 1894 , A REPORT ON THE IRON MOUNTAIN SHEET INCLUDING PORTIONS OF IRON, ST. FRANCOIS AND MADISON COUNTIES: MISSOURI GEOLOGICAL SURVEY, V. 9 , SHEET REPT. NO. 3 , P. 61 - 66 .

  • Production

    US BUREAU OF MINES, 1978

General comments

Subject category Comment text
Deposit MEASUREMENTS TAKEN ALONG THE FOOTWALL OF THE BIG CUT: S 90 DEG E, 15 DEG S (WEST END OF CUT); N 63 DEG W, 27 DEG S (NEAR MIDDLE OF CUT); N 35 DEG W, 17 DEG S (SOUTHEAST END OF CUT). BOTH VERTICAL AND INCLINED JOINTS ARE PROMINENT. CONGLOMERATE ORE IS NEARLY 200 FT THICK IN PLACES. NO ONE ATTEMPTED TO MINE THE BOULDER ORE ( 1912 ). ORE ALSO OCCURS IN COMPARATIVELY SMALL VEINS OF HEMATITE. ONE STRIKES NE-SW AND IS VERTICAL. SURFACE BOULDER AND CONGLOMERATE ORES CONSTITUTE THE MOST IMPORTANT ORE RESERVES AT PILOT KNOB. ORE OCCURS IN TWO BEDS. UPPER ORE BED RANGES FROM 10 TO 20 FT IN THICKNESS. THE LOWER ORE BED RANGES FROM 5 TO 30 FT IN THICKNESS. CONGLOMERATE ORE EXTENDS OVER 400,000 SQ FT (ESTIMATED).
Deposit ROCKS ON PILOT KNOB ARE DISTINCTLY STRATIFIED NEAR THE SUMMIT. BEDS HAVE A DIP ABOUT 13 DEG SW. ; INFO.SRC : 1 PUB LIT

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.

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