Maltby Limonite Mine
Millerton, New York
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.
Additional textual information about a site or mine.
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.
Formal or informal mining district names.
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 at the site.
PIT FILLED WITH AT LEAST 100 FEET OF WATER.
Processes that concentrated or enriched the mineralization of the mine.
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.
Characteristics of the ore body.
Geologic structural features affecting or characterizing the site or mine.
Tectonic setting in which the site or deposit is situated.
Physiographic area where the resource is found.
Mineralogical and chemical alteration at or near the site, which may help to indicate the geographic extent of the geological processes producing the mine.
Controls on emplacement of ore such as faults or other structural features.
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.
Other deposits in the same region.
Maltby Iron Mine
Maltby Iron Mine
Ore Hill Limonite Mine
Mount Riga Cheever Limonite Mine
Riga Manganese Mine
Brookpit Iron Mine
Chatfield Limonite Mine
Porter Limonite Mine
Dakin Limonite Mine
Dakin Iron Mine
* 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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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.