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Tilly Foster Magnetite Mine

Past Producer in Putnam county in New York, 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. Commodities
  6. Materials information
  7. Alteration
  8. Host and associated rocks
  9. Nearby scientific data
  10. Geologic structures
  11. Ore body information
  12. Controls for ore emplacement
  13. Economic information about the deposit and operations
  14. Mining district
  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 10067394
MRDS ID W000139
Record type Site
Current site name Tilly Foster Magnetite Mine
Related records 10248217

Geographic coordinates

Geographic coordinates: -73.64205, 41.41277 (WGS84)
Elevation 128
Relative position TWO MILES ESE OF CARMEL; 0.75 MILES NE OF BREWSTER HEIGHTS

Site location context

Political divisions (FIPS codes)

Putnam(county)

New York(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Lake Carmel(quadrangle 1:24,000 scale)

Bridgeport(quadrangle 1:100,000 scale)

Hartford(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Lower Hudson(hydrologic unit)

Lower Hudson(hydrologic accounting unit)

Lower Hudson-Long Island(hydrologic subregion)

Mid Atlantic(hydrologic region)

Geographic areas

Country State County
United States New York Putnam

Commodities

Commodity Importance
Iron Primary

Comments on the commodity information

  • OPEN PIT MASSIVE LENS; WORKINGS 1500 FEET LONG, 630 FEET DEEP; WIDTH 160 FEET IN MIDDLE, 80 FEET TOWARD EITHER END; STRIKE N. 40 DEG. E., DIP 70 DEG. SE; FAULTED; ORE SHOWS SLICKS, LEAN ORE STOCKPILED; ORE BED DISPLACED 90 FEET BY FAULT

Materials information

Materials Type of material
Brucite Gangue
Limestone Gangue
Olivine Gangue
Spinel Gangue
Chondrodite Unknown
Serpentine Unknown

Alteration

  • (Local) Metamorphism

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Gneiss
    Rock unit name Biotite-Quartz-Plagioclase Paragneiss
    Rock description Biotite-Quartz-Plagioclase Paragneiss
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Neoproterozoic

Nearby scientific data

(1) -73.64205, 41.41277
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Monoclinal Structure Of Previously Folded Material ; Reg.Trends: Northeast
Type of structure Local
Structure description Major And Minor Faults

Ore body information

  • General form DISTORTED AND FAULTED LENSE SHAPE BEDDED DEPOSIT
    Strike N. 40 DEG. E.
    Dip 70 DEG. ESE
    Thickness 48.77M
    Length 457.2M
    Width 192.02M
    Depth to top 0M
    Depth to bottom 192.02M

Controls for ore emplacement

  • Iron Rich Precambrian Bed

Comments on the geologic information

  • METAMORPHOSED IRON RICH BED ; MAJOR.UNITS: GNEISS ; GEOL.DESC: HIGHLY METAMORPHOSED AND FAULTED AREA; COMPLEX GEOLOGY; NUMEROUS THEORIES; ORE CHARACTERISTICS SIMILAR TO ORE OF MAHOPAC MINE, HARTFORD 2 DEG. SHEET NO. 22. ; REG.COM: SEVERAL PERIODS OF OROGENY; COMPLEX HISTORY
  • GEOL.DESC: LATER SUBSIDENCE OF REPUBLIC GRABEN REOPENED OLD FAULTS AND CREATED NEW FRACTURE ZONES WHICH BECAME CONTROL FOR GOLD-QUARTZ VEINS.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Significant No
Discovery year 1830
Discoverer Prospector
Year of first production 1864

Mining district

District name Southeast New York

Ownership information

  • Type Owner-Operator
    Owner Tilly Foster Iron Mine Co.

Production statistics

  • Year 1897
    Period 1864 - 1897
    Material ORE FE
    Accuracy Accurate
    Description Cp_Grade: ^Fe 50.0 %, Hi Grade
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Iron Iron 50wt-pct
  • Year 1897
    Period 1864 - 1897
    Material ORE FE
    Accuracy Accurate
    Description Cp_Grade: ^Fe 50.0 %, Hi Grade, ( 1864 - 1888 )
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Iron Iron 50wt-pct

Comments on the production information

  • FE3O4 67.42%; MNO2 0.54%; AL2O3 3.85%; CACO3 1.44%; MGO 13.30%; S 0.11%; P2O5 0.128%; SI 13.23% - BESSEMER GRADE, SELF FLUXING; HIGH GRADE ORE NOT MINED OUT
  • TOTAL PRODUCTION FROM DISTRICT IS GT 2,500,000 TONS, WITH GROSS VALUE OF MORE THAN $50,000,000. NO PRODUCTION FIGURES GIVEN BEYOND 1912.

Comments on the reserve resource information

  • MINING STOPPED IN RICH ORE BECAUSE OF UNSAFE PIT WALLS; PROBABLY MUCH HIGH AND LOW GRADE ORE REMAINS.
  • NO FIGURES AVAILABLE; HIGH AND LOW GRADE ORE PRESENT, PROBABLY IN LARGE AMOUNT
  • PROBABLY VERY LARGE LOW GRADE ORE RESOURCES FROM EXTENSIVE BUT FAULTED BED; PROBABLY MUCH HIGH GRADE ORE AVAILABLE; NO FIGURES AVAILABLE

Workings at the site

  • Type of workings Surface/Underground
    Area 2.103HA
    Overall depth 192.02M
    Overall length 182.88M
    Overall width 121.92M

Comments on the workings information

  • OVERHEAD COVER OF DIPPING ORE BODY REMOVED SO AS TO PERMIT OPEN PIT MINING.

Comments on development

  • ECON.COM: MINE PRODUCTION CEASED BECAUSE OF COLLAPSING PIT WALLS; MINE STILL IN RICH ORE; PRESENTLY PIT NEARLY FILLED WITH WATER.
  • NO INFORMATION ON EXPLORATION AND DEVELOPMENT WORK BEYOND 1942.

Reference information

Bibliographic references

  • Deposit

    SMOCK, J. C., 1889, "IRON MINES OF NEW YORK", N.Y.S. MUSEUM BULL. 7, MAP, TEXT, PG. 22, 23

  • Deposit

    COLONY, R. J., 1921, "MAGNETITE DEPOSITS SE. NEW YORK", N.Y.S. MUSEUM BULL. 249, MAP, TEXT, PG. 121-124

  • Deposit

    NEWLAND, R. H., 1919, "MINERAL RESOURCES OF NEW YORK", N.Y.S. MUSEUM BULL. 223, TEXT, PG. 123-124

  • Deposit

    1839 RECON NEW YORK STATE GEOLOGICAL SURVEY

  • Deposit

    1873 OTHER BREIDEN BAUGH; E. S.; SCHOLAR; MINERALOGY

  • Deposit

    1884 GEOLMAP WENDT, A. F.; SCHOLAR; AREA MAP AND MINE

  • Deposit

    1886 GEOLMAP RUTTMAM, F. S.; SCHOLAR, MINE GEOLOGY

  • Production

    SMOCK, 1889

  • Reserve-Resource

    COLONY, 1921

General comments

Subject category Comment text
Deposit ORE BODY CUT BY NORTH-SOUTH FAULT; EAST SIDE DOWN 90 FEET; DEPOSIT ALSO NEAR LARGER FAULT
Deposit USGS TOPO MAP, 1960, "LAKE CARMEL, N.Y.", 1:24,000, MINE SYMBOL AND PIT. PRESENTLY OPEN PIT POND 600 FEET LONG, 400 FEET WIDE, REPORTEDLY MORE THAN 600 FEET DEEP. FE 48.91%, S 0.548%, P 0.015%, SIO2 12.18%, AL2O3 0.79%, MNO2 O.10%, CACO3 3.10%, MGO 11.72%, CO2 0.40% - HIGH MAGNESIA AND LIME AND LOW SILICA MAKE ORE SELF-FLUXING ; INFO.SRC : 1 PUB LIT
Deposit INFO TAKEN SOLELY FROM REF. NO. 1.
Deposit ABOVE MEASUREMENTS APPLY TO DISTRICT AS A WHOLE

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JAN-1972 D'Agostino, John P. U.S. Geological Survey

Beyond USGS

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

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