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Maltby Limonite Mine

Millerton, New York

41.9699°N 73.4973°W

Mine Overview

The Maltby Limonite Mine is near Millerton, New York. Historically the site has been associated with the New York Salisbury Iron Mining District which is now part of the Appalachian National Scenic Trail. The site was first discovered in 1750 by C. S. Maltby. The Maltby Limonite Mine was closed at the time of data entry with no known plans to re-open. Past operations took place from 1750 to 1885. Mine operations consist of surface workings extending 2.10 hectares (5.20 acres). There is one known shaft. The ore mined is composed of limonite with waste material consisting primarily of phlogopite, tremolite and biotite. The ore is wedge shaped 182 meters (600 feet) long, 121 meters (400 feet) wide, and 45 meters (150 feet) thick. The Taconic Section of the Appalachian Highlands characterize the geomorphology of the surrounding area.

Site identification and general characteristics. Learn about USGS mines.

  • Iron Primary Commodity
  • Site Record Type?
  • Mine Development Status?
  • Residual Mine Type?
  • 1750 Year Discovered?
  • Ore Mineral In Place Discovery Method?
  • C S Maltby Discovered By?
  • 1750 to 1885 Last Year of Production
  • 1750 First Year Of Production?
  • Metallic Site Commodity Type?

Mine Names

  1. Name? Status?
  2. Maltby Limonite Mine Current

Owner Name and Address

C. S. Maltby

Type
Owner

Thomas Iron Company

Lehigh Valley, Pennsylvania
Type
Operator

Commodities

Additional textual information about a site or mine.

  1. Commodity Type Importance
  2. Iron Metallic Primary

Notes

TOPO SHOWS WORKINGS AS POND 600 FEET LONG EAST-WEST, 400 FEET WIDE NORTH-SOUTH MORE THAN 150 FEET DEEP; PIT WALL SHOWS NUMEROUS FAULTS IN BOTH ORE ZONE AND UNDERLYING DOLOMITE; LARGEST FAULT STRIKE N-S, DIP VERTICAL; ORE ZONE STRIKE N 70 DEG. W, DIP ABOUT 45 DEG. N; ZINC AND MANGANESE PROBABLY PRESENT BUT NOT TESTED FOR.

Deposit

PIT IN FRACTURE ZONE, AT LEAST 5 SMALL FAULTS PRESENT.

USGS TOPO, 1956, SHARON-CONN.-N. Y ., 1:24, 000, SHOWN AS POND; INFORMATION SOURCE: 1 PUB LIT.

Location Info

  1. Continent Country State County
  2. North America The United States New York Dutchess

Mining Districts

Formal or informal mining district names.

  1. District
  2. New York Salisbury Iron Mining District

Development

EARLY MAJOR IRON AREA, 1734 TO 1900; FOUNDRIES USED FOREST CHARCOAL; ORE HAD HIGH MANGANESE AND LOW PHOSPHOROUS FOR HARD IRON; EASILY SEEN DEPOSITS MINED.

Workings

Workings at the site.

Surface Workings #1

  • Type: Surface
  • Surface Area: 2.103 Hectares
  • Surface Length: 182.88 Meters
  • Surface Width: 121.92 Meters

Workings

PIT FILLED WITH AT LEAST 100 FEET OF WATER.

Concentration Process

Processes that concentrated or enriched the mineralization of the mine.

  1. Concentration Process
  2. Weathering Of Iron Rich Sediment Beds

Geology

MINE AT CONTACT OF DOLOMITE AND SLATE; DOLOMITES, SLATES, SCHIST; MINE NEAR CONTACT WITH MID ORDOVICIAN BERKSHIRE SCHIST AND NEAR OVERTHRUST OF LOW CAMBRIAN EVERETT SCHIST.; THRUST AND FRACTURED BEDROCK.

Materials

Minerals or other materials present in the mine.

  1. Role? Material?
  2. Gangue/Waste Biotite
  3. Gangue/Waste Phlogopite
  4. Gangue/Waste Tremolite
  5. Ore Limonite

Orebody

Characteristics of the ore body.

  • Length:
  • Width: 121.92 meters (400.00 feet)
  • Bottom Depth: 45.72 meters (150.00 feet)
  • Thickness: 45.72 meters (150.00 feet)
  • Strike: north 70 degrees west
  • Dip: 45 degrees northeast

Structure

Geologic structural features affecting or characterizing the site or mine.

  1. Scale Description
  2. Local Faults
  3. Regional Major Overthrust Belt; Reg-Trends: North-South

Tectonic

Tectonic setting in which the site or deposit is situated.

  1. Setting?
  2. Many Fractures In Overthrust Belt

Physiography

Physiographic area where the resource is found.

  1. Division Province? Section
  2. Appalachian Highlands New England Province Taconic Section

Alteration

Mineralogical and chemical alteration at or near the site, which may help to indicate the geographic extent of the geological processes producing the mine.

  1. Type? Alterations
  2. Local Mass Weathering Of Small Fractured Blocks

Ore Control

Controls on emplacement of ore such as faults or other structural features.

  1. Text?
  2. Probably Mass Weathering Of Iron Rich Dolomite Layers

Reserve-resource

PROBABLY MODERATE AMOUNTS OF LOW GRADE ORE REMAINS.

PROBABLY NEARLY ALL HIGH GRADE ORE MINED; PROBABLY MODERATE LOW GRADE ORE PRESENT; NO FIGURES AVAILABLE.

NO FIGURES AVAILABLE, PROBABLY SOME LOW GRADE ORE POTENTIAL.

Nearby Deposits

Other deposits in the same region.

  1. Maltby Iron Mine

    • Iron commodity Site type Mine status
    • Dutchess, New York
    • Residual
    Read More

  2. Maltby Iron Mine

    • Iron commodity Site type Mine status
    • Dutchess, New York
    • Surface
    • 0.04 miles
    Read More

  3. Ore Hill Limonite Mine

    • Iron commodity Site type Mine status
    • Litchfield, Connecticut
    • Surface And Underground
    • 1.45 miles
    Read More

  4. Mount Riga Cheever Limonite Mine

    • Iron commodity Site type Mine status
    • Dutchess, New York
    • 1.50 miles
    Read More

  5. Riga Manganese Mine

    • Iron commodity Site type Mine status
    • Dutchess, New York
    • Surface
    • 1.50 miles
    Read More

  6. Brookpit Iron Mine

    • Iron commodity Site type Mine status
    • Litchfield, Connecticut
    • Surface
    • 1.62 miles
    Read More

  7. Chatfield Limonite Mine

    • Iron commodity Site type Mine status
    • Litchfield, Connecticut
    • Surface
    • 2.05 miles
    Read More

  8. Porter Limonite Mine

    • Iron commodity Site type Mine status
    • Litchfield, Connecticut
    • Surface
    • 2.77 miles
    Read More

  9. Dakin Limonite Mine

    • Iron commodity Site type Mine status
    • Dutchess, New York
    • 2.95 miles
    Read More

  10. Dakin Iron Mine

    • Iron commodity Site type Mine status
    • Dutchess, New York
    • Residual
    • 2.95 miles
    Read More

Nearby Places

Nearby Lands

Footnotes

* Mine bounds on map indicate the general area that a mine occupies. For an detailed map, refer to the overseeing BLM field office.

** The mine central point is based on an average of the mine's bounding box(es) and does not necessarily fall on the claim itself.

1 World-class significance is determined by total endowment of the contained commodity. This includes all past production and remaining reserves. Each commodity is considered separately and commodities cannot be combined to arrive at a significant size. The tonnage thresholds are from the mine model grade-tonnage studies. As of June 2008, many entries were classified as significant under less strict rules.

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