Chatham Great Hill Cobalt Nickel Arsenopyrite Mine
East Hampton, Connecticut
The Chatham Great Hill Cobalt Nickel Arsenopyrite Mine is near East Hampton, Connecticut. Historically the site has been part of the East Hampton Mining District. The site was first discovered in 1661. The Chatham Great Hill Cobalt Nickel Arsenopyrite Mine was closed at the time of data entry with no known plans to re-open. Mine operations consist of workings of unknown type. There is one known shaft. Subsurface length extends a maximum of 305 meters (1,000 feet). The ore mined is composed of niccolite, sphalerite and smaltite with waste material consisting primarily of staurolite, biotite and plagioclase. Associated rock in this area is mafic intrusive rock from the Lower Devonian epoch 419.20 to 393.30 million years ago. 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.
Additional textual information about a site or mine.
STUGARD GEOLOGIC MAP AT 1:24000; SHOWS MINE LOCATION; INCLUDES ASSAYS FROM 1853 TO 1855 WORKINGS AS FOLLOWS, UNWASHED ORE, N. 9. 44 %, CO. 3. 82%, IRON 11. 85%, 54. 78%, AS 70. 11%; WASHED ORE, NICKEL 10. 17%, CO 3. 85%, IRON 12. 92%, 55. 62%, AS 67. 44%. CHATHAM MINE ASSAY SAMPLES, USGS LAB FILES, SAMPLES NOS. BCT 192, 193, IN HM 3336; INFORMATION SOURCE: 1 PUB LIT.
Formal or informal mining district names.
Workings at the site.
WORKINGS 700 TO 1000 FEET IN LENGTH
COLLINS HILL SCHIST FORMATION MORE EQUIVALENT TO ORDOVICIAN BRIMFIELD SCHIST FORMATION THAN TO SILURO-DEVONIAN BOLTON SCHIST FORMATION. STUGARD SHOWS INFERRED FAULT TRENDING N 80 DEG. EAST INTERSECTING THE NORTHERN VERTICAL SHAFT AND ON STRIKE WITH THE MAIN ADIT. ALL ROCKS AND DIKES IN AREA METAMORPHOSED.
Characteristics of the ore body.
Geological materials at the site.
Physiographic area where the resource is found.
Controls on emplacement of ore such as faults or other structural features.
FIGURES LACKING; PROBABLY ONLY SMALL AMOUNTS OF HIGH GRADE SUPERGENE ORE AND MODERATE AMOUNTS OF LOW GRADE SULFIDE ORE AVAILABLE.
Other deposits in the same region.
Chatham Great Hill Mine
Governor Winthrops Mine
Unnamed Nickel Mine
Hale-Walker Beryllium Prospect And Feldspar Mine
Chatham Cobalt Mine
White Rock Pegmatite Quarry Feldspar Mine
Walden Gem Mine
Western Quarry Feldspar Mine
Case Feldspar Prospect
* 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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FIVE FAILURES TO MINE COBALT AND NICKEL BETWEEN 1762 AND 1855. FIRST PROSPECTED IN 1661 FOR SILVER. FROM 1770 TO 1781 SEBASTIAN STEPHANNEY MINED 20 TONS COBALT ORE; FROM 1818 TO 1821 SETH HUNT MINED FOR COBALT 1000 POUNDS OF ORE WHICH WAS NEARLY ALL NICKEL ORE. IN 1884 PROFESSOR CHARLES SHEPARD MINED WITH NO SUCCESS. FROM 1853 TO 1855 COBALT MINED BY CHATHAM COBALT MINING COMPANY; MEAGER PRODUCTION BUT MUCH DEVELOPMENT. PROSPECTED ABOUT ONE MILE ON STRIKE ABOUT N 70 DEG. EAST, DIP 50 DEG. NW; TWO VERTICAL SHAFTS, TWO INCLINED SHAFTS, TWO ADITS AND ONE CROSS-CUT USED FOR MINING. VERTICAL DEPTH 120 FEET, UNDERGROUND DEVELOPMENT TOTALED 700 TO 1000 FEET OR MORE. WORKINGS ARE WITHIN DISTANCE OF 1000 FEET, ALONG BOTH SIDES OF MINE BROOK. TRENCH PRESENT 700 FEET DUE WEST OF CROSS-CUT OPERATION WHICH IS SOUTHERN-MOST WORKING. ORE FOUND IN BRECCIA ZONE AS WIDE SPREAD DISSEMINATIONS AND MASSIVE IN VEIN QUARTZ. ORE ZONE CUT BY PEGMATITE DIKES, ARSENOPYRITE MOST COMMON ORE IN VEIN.
QUARTZ. VEIN QUARTZ ABOUT ONE FOOT THICK.