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Sylvan Lake Limonite Mine

Beekman, New York

41.6036°N 73.7426°W

Mine Overview

The Sylvan Lake Limonite Mine is near Beekman, New York. Historically the site has been associated with the Fishkill Belt Mining District which is now part of the Appalachian National Scenic Trail. The site was first discovered in 1825 by An Unknown Prospector. The Sylvan Lake Limonite Mine was closed at the time of data entry with no known plans to re-open. Past operations took place from 1882. Mine operations consist of surface workings extending 1.10 hectares (2.71 acres). There is one known shaft. The ore mined is composed of limonite. The ore body is described as tabular shaped 152 meters (500 feet) long, 76 meters (250 feet) wide, and 18 meters (60 feet) thick. The New England Upland 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?
  • 1825 Year Discovered?
  • Ore Mineral In Place Discovery Method?
  • Prospector Discovered By?
  • 1882 Last Year of Production
  • Metallic Site Commodity Type?

Mine Names

  1. Name? Status?
  2. Sylvan Lake Limonite Mine Current

Owner Name and Address

Clove Iron Works

Type
Owner-Operator

Commodities

Additional textual information about a site or mine.

  1. Commodity Type Importance
  2. Iron Metallic Primary

Notes

PIT IS NORTHERN PART OF POND; THE SOUTHERN TWO-THIRDS OF POND BEING THE PIT OF THE LARGER TOWER FISHKILL LIMONITE MINE (HARTFORD 2 DEG. SHEET, NO. 32 ). SYLVAN LAKE POND ON TOPO SHEET EXTENDS DUE NORTH; LENGTH 500 FEET, WIDTH 250 FEET, ABOUT 90 FEET DEEP. PROBABLY MANGANESE AND ZINC PRESENT BUT NOT STUDIED OR TESTED.

Deposit

DUE NORTH EXTENSION OF TOWER FISHKILL MINE PIT. THE THICKNESS OF THE DEPOSIT RANGES FROM 50-60 FEET

USGS TOPO, 1960, POUGHQUAG, 1:24, 000, MAP SYMBOL AS POND. LIMONITE ORE ON SURFACE AND OVERLAIN BY AS MUCH AS 30 FEET OF GLACIAL DRIFT; BEDROCK NOT ENCOUNTERED; INFORMATION SOURCE: 1 PUB LIT.

DISCOVERY YEAR: EARLY 1800'S

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. Fishkill Belt Mining District

Development

EARLY IRON PRODUCING DISTRICT, 1734-1900; LOCAL IRON MARKET.

Workings

Workings at the site.

Surface Workings #1

  • Type: Surface
  • Surface Area: 1.095 Hectares
  • Surface Length: 152.4 Meters
  • Surface Width: 76.2 Meters

Workings

MINING SERIOUSLY HAMPERED BY WATER INFLOW.

Concentration Process

Processes that concentrated or enriched the mineralization of the mine.

  1. Concentration Process
  2. Mass Weathering Of Siderite Rich Carbonate Beds

Geology

BEDROCK NOT ENCOUNTERED; CARBONATE; DEEPLY WEATHERED FAULT ZONE; DEEP MASS WEATHERING OF FRACTURE ZONE.

Materials

Minerals or other materials present in the mine.

  1. Role? Material?
  2. Ore Limonite

Orebody

Characteristics of the ore body.

  • Length:
  • Width: 76.20 meters (250.00 feet)
  • Top Depth: 9.14 meters (29.99 feet)
  • Bottom Depth: 27.43 meters (89.99 feet)
  • Thickness: 18.29 meters (60.01 feet)
  • Strike: north
  • Dip: north

Structure

Geologic structural features affecting or characterizing the site or mine.

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

Tectonic

Tectonic setting in which the site or deposit is situated.

  1. Setting?
  2. In Major Overthrust Belt

Physiography

Physiographic area where the resource is found.

  1. Division Province? Section
  2. Appalachian Highlands New England Province New England Upland 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 Bedrock

Ore Control

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

  1. Text?
  2. Probably Mass Weathering Of Siderite Rich Carbonate Layers, Though None Reported

Reserve-resource

NO FIGURES AVAILABLE, PROBABLY MODERATE LOW GRADE ORE RESERVES.

NO FIGURES AVAILABLE, PROBABLY MODERATE LOW GRADE ORE RESOURCES.

PROBABLY LOW GRADE ORE REMAINS, DRAINAGE A PROBLEM.

Nearby Deposits

Other deposits in the same region.

  1. Tower Fishkill Limonite Mine

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

  2. Old Fishkill Limonite Mine

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

  3. Sylvan Lake Limonite Mine

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

  4. Fishkill Iron Mine

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

  5. Sylvan Lake Limonite Mine

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

  6. Unnamed Limonite Prospect

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

  7. Horton Limonite Mine

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

  8. Beekman Limonite Mine

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

  9. Horton Iron Mines

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

  10. Beekman Iron Mine

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

Nearby Places

Nearby Mining Districts

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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