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Croton - Theall Magnetite Mine

Past Producer in Putnam county in New York, United States with commodities Iron, Copper, Sulfur
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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 10105443
MRDS ID W000141
Record type Site
Current site name Croton - Theall Magnetite Mine
Related records 10296653

Geographic coordinates

Geographic coordinates: -73.65094, 41.36805 (WGS84)
Elevation 143
Relative position 1.5 MILES NORTH OF CROTON FALLS, 0.5 MILES EAST OF CROTON FALLS RESERVOIR

Site location context

Political divisions (FIPS codes)

Putnam(county)

New York(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Croton Falls(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
Copper Tertiary
Sulfur Tertiary

Comments on the commodity information

  • MAIN ADIT 1400 FEET LONG EXTEND SOUTHWARD THROUGH HILL TO MCCOLLUM MINE; LOWER STOPE ADIT 160 FEET BELOW MAIN ADIT; PROVEN ORE ZONE WIDTH 60 TO 110 FEET; RICH ORE ZONE 10 TO 15 FEET WIDE; RICH ORE 50% IRON, LEAN ORE 38% IRON, CAN BE CONCENTRATED MAGNETICALLY TO 62% IRON; STRIKE N 30 DEG. E; DIP VERTICAL

Materials information

Materials Type of material
Chalcopyrite Ore
Magnetite Ore
Pyrite Ore
Apatite Gangue
Feldspar Gangue
Hornblende Gangue
Mica Gangue
Quartz Gangue

Alteration

  • (Local) Metamorphism Of Rock Units

Host and associated rocks

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

Nearby scientific data

(1) -73.65094, 41.36805
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Precambrian Uplands ; Reg.Trends: Northeast
Type of structure Local
Structure description Faulted Blocks

Ore body information

  • General form BLANKET
    Strike N 30 DEG. E
    Dip VERTICAL
    Thickness 79.25M
    Length 762M
    Width 33.53M
    Depth to top 0M
    Depth to bottom 48.77M

Controls for ore emplacement

  • Iron Rich Precambrian Bed

Comments on the geologic information

  • METAMORPHOSED BEDS WITH MAGNETITE ; MAJOR.UNITS: PARAGNEISSES AND PEGMATITES ; GEOL.DESC: HIGHLY METAMORPHOSED AND FAULTED AREA; COMPLEX GEOLOGY; NUMEROUS THEORIES; SOLID MASSIVE MAGNETITE AND DISSEMINATED MAGNETITE ; REG.COM: METAMORPHOSED, FOLDED, AND FAULTED UPLANDS

Economic information about the deposit and operations

Development status Past Producer
Commodity type Both
Significant No
Discovery year 1883
Discoverer Prospector
Year of first production 1880

Mining district

District name Southeast New York

Ownership information

  • Type Operator
    Owner Nipissing Mining Co., Ltd.
    Home office Toronto, Canada
  • Type Owner
    Owner Croton Magnetic Iron Mines Co.

Production statistics

  • Year 1883
    Period 1880 - 1883
    Material ORE FE
    Accuracy Estimate
    Description Cp_Grade: ^38 % Fe Lo Grade Ore
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Iron Iron 38wt-pct
  • Year 1883
    Period 1880 - 1883
    Material ORE FE
    Accuracy Accurate
    Description Cp_Grade: ^50 % Fe Hi Grade Ore
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Iron Iron 50wt-pct

Comments on the production information

  • MOST ORE REQUIRES CONCENTRATION TO 50% GRADE; HIGH SULFUR, MINOR CU.

Comments on the reserve resource information

  • 8.5 MILLION TONS WHEN ADDED TO ADJACENT CROTON - MCCOLLUM MAGNETITE MINE
  • MOST OF ORE ZONE LOW GRADE MAGNETITE ORE; PROBABLY MOST LOW GRADE ORE REMAINS.
  • NO FIGURES AVAILABLE, PROBABLY VERY LARGE LOW GRADE ORE POTENTIAL RESERVE.

Workings at the site

  • Type of workings Underground
    Length 304.8M
    Overall depth 30.48M

Comments on the workings information

  • ADIT EXTENDS 1400 FEET SOUTHWESTWARD THROUGH HILL TO EXIT AT CROTON - MCCOLLUM MINE OPENING

Comments on development

  • ECON.COM: EARLY IRON DISTRICT, 1734 - 1900; IRON ORE USED IN LOCAL MARKET

Reference information

Bibliographic references

  • Deposit

    SMOCK, J.C., 1889, "IRON MINES OF NEW YORK", N.Y.S. MUSEUM BULL. 7, MAP, TEXT, PG 21, 22

  • Deposit

    COLONY, R.J., 1921, "MAGNETITE DEPOSITS SE. NEW YORK", N.Y.S. MUSEUM BULL. 249, MAP, TEXT, PG 118-120

  • Deposit

    NEWLAND, D.H., 1919, "MINERAL RESOURCES OF NEW YORK", N.Y.S. MUSEUM BULL. 223, TEXT, PG 125

  • Deposit

    1889 RECON NEW YORK STATE GEOLOGICAL SURVEY

  • Deposit

    1921 RECON NEW YORK STATE GEOLOGICAL SURVEY

  • Deposit

    1942 DIREXPL BETHLEHEM STEEL CO., DRILL CORE, PROVE RESERVES

  • Production

    SMOCK, 1889

General comments

Subject category Comment text
Deposit MINE ADJACENT TO CROTON - MCCOLLUM MINE; TOTAL MINERALIZATION LENGTH 5500 FEET
Deposit USGS TOPO MAP, 1960, "CROTON FALLS, N.Y.", 1:24,000, ADIT SYMBOL FOR MINE. ; INFO.SRC : 1 PUB LIT

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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