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Chatham Great Hill Cobalt Nickel Arsenopyrite Mine

Past Producer in Middlesex county in Connecticut, United States with commodities Arsenic, Iron, Cobalt, Nickel, Sulfur, Zinc, Lead, Copper
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Host and associated rocks
  8. Nearby scientific data
  9. Ore body information
  10. Controls for ore emplacement
  11. Economic information about the deposit and operations
  12. Mining district
  13. Production statistics
  14. Workings at the site
  15. Links to other databases
  16. Bibliographic references
  17. General comments
  18. Reporter information

Geologic information

Identification information

Deposit ID 10067769
MRDS ID W000604
Record type Site
Current site name Chatham Great Hill Cobalt Nickel Arsenopyrite Mine
Related records 10118935

Geographic coordinates

Geographic coordinates: -72.55035, 41.57721 (WGS84)

Site location context

Political divisions (FIPS codes)

Middlesex(county)

Connecticut(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Middle Haddam(quadrangle 1:24,000 scale)

Hartford(quadrangle 1:100,000 scale)

Hartford(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Outlet Connecticut River(hydrologic unit)

Lower Connecticut(hydrologic accounting unit)

Connecticut(hydrologic subregion)

New England(hydrologic region)

Geographic areas

Country State County
United States Connecticut Middlesex

Commodities

Commodity Importance
Arsenic Critical Primary
Iron Primary
Cobalt Critical Primary
Nickel Critical Primary
Sulfur Secondary
Zinc Critical Tertiary
Lead Tertiary
Copper Tertiary

Comments on the commodity information

  • 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 FT, 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.

Materials information

Materials Type of material
Cobaltite Ore
Erythrite Ore
Galena Ore
Niccolite Ore
Siderite Ore
Smaltite Ore
Sphalerite Ore
Biotite Gangue
Plagioclase Gangue
Staurolite Gangue

Analytical data

Result ASSAY SAMPLE NO 192 AND 193 SHOW HIGH VALUES OF AG IN PPM, AS 2000 PPM, BA 700 PPM, CU 50 PPM, PB 150 PPM, V 100 PPM, ZN 200 PPM.

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock
    Stratigraphic age (youngest) Early Devonian
    Stratigraphic age (youngest) Middle Ordovician

Nearby scientific data

(1) -72.55035, 41.57721
ListMap

Economic information

Ore body information

  • Strike N. 70 DEG. EAST
    Dip 50 DEG. NW.

Controls for ore emplacement

  • Probably Fault Zone, Siliceous In Part, In Schist

Comments on the geologic information

  • GEOL.DESC: 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.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Both
Significant No
Discovery year 1661

Mining district

District name East Hampton

Production statistics

  • Year 1855
    Period 1853 - 1855
    Material ORE
    Description Cp_Grade: ^9 % Co, 9 % Ni
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Ore Cobalt Cobalt 9wt-pct
    Ore Nickel Nickel 9wt-pct

Comments on the production information

  • COMPLEX SULFIDE ORES; ASSAYS OF 13 MINED OUT ADIT AND TRENCH CHANNEL SAMPLES SHOW NO DETECTABLE NI OR CO EXCEPT FOR TRACE OF CO IN TWO SAMPLES; NOTED ARSENOPYRITE COMMON IN VEIN QUARTZ. ASSAY SAMPLE NO 192 AND 193 SHOW HIGH VALUES OF AG IN PPM,AS 2000 PPM, BA 700 PPM, CU 50 PPM, PB 150 PPM, V 100 PPM, ZN 200 PPM.

Comments on the reserve resource information

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

Workings at the site

  • Type of workings Unknown
    Length 304.8M

Comments on the workings information

  • WORKINGS 700 TO 1000 FT IN LENGTH.

Comments on development

  • TOTAL$: US

Reference information

Bibliographic references

  • Deposit

    SHEPARD, C.U., 1837, "REPORT", CONN. GEOLOGICAL SURVEY, TEXT P. 5

  • Production

    BLAKE, 1882

General comments

Subject category Comment text
Deposit STUGARD GEOL. MAP AT 1:24000; SHOWS MINE LOCATION; INCLUDES ASSAYS FROM 1853 TO 1855 WORKINGS AS FOLLOWS, UNWASHED ORE, N. 9.44 %, CO. 3.82%, FE 11.85%, 54.78%, AS 70.11%; WASHED ORE, NI 10.17%, CO 3.85%, FE 12.92%, 55.62%, AS 67.44%.CHATHAM MINE ASSAY SAMPLES, "USGS LAB FILES", SAMPLES NOS. BCT 192, 193, IN HM 3336 ; INFO.SRC : 1 PUB LIT

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAR-1972 D'Agostino, John P. U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

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