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Chatham Great Hill Cobalt Nickel Arsenopyrite Mine

East Hampton, Connecticut

41.58°N 72.5497°W

Mine Overview

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.

  • Arsenic, Cobalt, and Iron Primary Commodity
  • Sulfur Secondary Commodity
  • Copper, Lead, and Zinc Secondary Commodity
  • Site Record Type?
  • Mine Development Status?
  • Surface Operation Type?
  • 1661 Year Discovered?
  • Metallic Site Commodity Type?
Chatham Great Hill Cobalt Nickel Arsenopyrite Mine Near East Hampton, Connecticut

Chatham Great Hill Cobalt Nickel Arsenopyrite Mine Near East Hampton, Connecticut

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Mine Names

  1. Name? Status?
  2. Chatham Cobalt Mine Current
  3. Chatham Great Hill Cobalt Nickel Arsenopyrite Mine Current

Commodities

Additional textual information about a site or mine.

  1. Commodity Type Importance
  2. Arsenic Metallic Primary
  3. Cobalt Metallic Primary
  4. Iron Metallic Primary
  5. Nickel Metallic Primary
  6. Sulfur Non-Metallic Secondary
  7. Copper Metallic Tertiary
  8. Lead Metallic Tertiary
  9. Zinc Metallic Tertiary

Notes

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.

Deposit

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.

Location Info

  1. Continent Country State County
  2. North America The United States Connecticut Middlesex

Land Status

Land status information.

  1. Land Status? Admin Area?
  2. Private -

Mining Districts

Formal or informal mining district names.

  1. District
  2. East Hampton Mining District

Development

TOTAL$: US

Workings

Workings at the site.

Workings #1

  • Type: Unknown
  • Sub Surface Length: 304.8 Meters

Workings

WORKINGS 700 TO 1000 FEET IN LENGTH

Geology

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.

Materials

Minerals or other materials present in the mine.

  1. Role? Material?
  2. Gangue/Waste Biotite
  3. Gangue/Waste Plagioclase
  4. Gangue/Waste Staurolite
  5. Ore Cobaltite
  6. Ore Erythrite
  7. Ore Galena
  8. Ore Niccolite
  9. Ore Siderite
  10. Ore Smaltite
  11. Ore Sphalerite

Orebody

Characteristics of the ore body.

  • Strike: n. 70 deg. east
  • Dip: 50 deg. nw.

Rocks

Geological materials at the site.

  1. Class? 1st Order Name? 2nd Order Name? 3rd Order Name? 4th Order Name? Most Specific Name? Begin Time End Time Description?
  2. Associated Rock Plutonic Rock Mafic Intrusive Rock - - Mafic Intrusive Rock Lower Devonian Lower Devonian -
  3. Mineralization - - - - - Middle Ordovician Middle Ordovician -

Physiography

Physiographic area where the resource is found.

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

Analytical Data

Results of chemical or mineralogical analysis on materials at or near the site

  1. Line? Analysis Data?
  2. 1 ASSAY SAMPLE NO 192 AND 193 SHOW HIGH VALUES OF SILVER IN PPM, AS 2000 PPM, BA 700 PPM, COPPER 50 PPM, LEAD 150 PPM, V 100 PPM, ZINC 200 PPM.

Ore Control

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

  1. Text?
  2. Probably Fault Zone, Siliceous In Part, In Schist

Reserve-resource

FIGURES LACKING; PROBABLY ONLY SMALL AMOUNTS OF HIGH GRADE SUPERGENE ORE AND MODERATE AMOUNTS OF LOW GRADE SULFIDE ORE AVAILABLE.

Nearby Deposits

Other deposits in the same region.

  1. Chatham Great Hill Mine

    • Cobalt commodity Site type Mine status
    • Middlesex, Connecticut
    • Vein
    • 0.19 miles
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  2. Governor Winthrops Mine

    • Gold commodity Site type Mine status
    • Middlesex, Connecticut
    • Surface
    • 0.56 miles
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  3. Unnamed Nickel Mine

    • Nickel commodity Site type Mine status
    • Middlesex, Connecticut
    • 0.92 miles
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  4. Pegmatite Quarries

    • Feldspar commodity Site type Mine status
    • Middlesex, Connecticut
    • Surface
    • 1.02 miles
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  5. Hale-Walker Beryllium Prospect And Feldspar Mine

    • Beryllium commodity Site type Mine status
    • Middlesex, Connecticut
    • Pegmatite Dike
    • 2.00 miles
    Read More

  6. Chatham Cobalt Mine

    • Cobalt commodity Site type Mine status
    • Middlesex, Connecticut
    • Underground
    • 2.39 miles
    Read More

  7. White Rock Pegmatite Quarry Feldspar Mine

    • Feldspar commodity Site type Mine status
    • Middlesex, Connecticut
    • Surface
    • 3.01 miles
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  8. Walden Gem Mine

    • Gemstone commodity Site type Mine status
    • Middlesex, Connecticut
    • Surface
    • 3.08 miles
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  9. Western Quarry Feldspar Mine

    • Feldspar commodity Site type Mine status
    • Middlesex, Connecticut
    • Surface
    • 3.14 miles
    Read More

  10. Case Feldspar Prospect

    • Feldspar commodity Site type Prospect status
    • Middlesex, Connecticut
    • 3.35 miles
    Read More

Nearby Places

Nearby Mining Districts

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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