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Markham Mica Mine

Past Producer in Middlesex county in Connecticut, United States with commodities Mica, Feldspar
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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. Ownership information
  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 10067607
MRDS ID W000398
Record type Site
Current site name Markham Mica Mine
Related records 10142884

Geographic coordinates

Geographic coordinates: -72.5348, 41.54943 (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
Mica Primary
Feldspar Tertiary

Comments on the commodity information

  • OWNED BY GRACE MARKHAM. LEASED AND MINED BY PETER ARMANDO AND ROMANO MILANESE FROM NOV. 1943 TO APRIL 1944. PIT TRENDS N. 65 DEG. WEST, 25 FEET LONG, 12 FEET WIDE, ABOUT 14 FEET DEEP. DIKE STRIKES N. 30 DEG. EAST, DIP 65 DEGREES. NW., ABOUT 20 FEET THICK. MINED ONLY FOR MICA, VERY LOW GRADE DEPOSIT. ADDITIONAL QUARRY IN PEGMATITE LOCATED 500 FEET TO SOUTHEAST.

Materials information

Materials Type of material
Mica Ore
Quartz Ore
Apatite Gangue
Biotite Gangue
Garnet Gangue
Tourmaline Gangue

Host and associated rocks

  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock
    Stratigraphic age (youngest) Late Permian
  • Host or associated Host
    Rock type Metamorphic Rock > Gneiss

Nearby scientific data

(1) -72.5348, 41.54943
ListMap

Economic information

Ore body information

  • Strike N. 30 DEG. EAST
    Dip 65 DEG. NW
    Thickness 6.1M

Controls for ore emplacement

  • Pegmatite Dike

Comments on the geologic information

  • GEOL.DESC: SMALL SWARM OF PEGMATITE DIKES; NUMEROUS SWARMS OF DIKES IN NARROW NORTH-SOUTH ZONE MOSTLY IN THE COLLINS HILL SCHIST FORMATION. INDIVIDUAL DIKES TREND MOSTLY NORTHWARD

Economic information about the deposit and operations

Development status Past Producer
Commodity type Non-metallic
Significant No
Production years 1943 TO 1944

Mining district

District name East Hampton

Ownership information

  • Type Operator
    Owner Peter Armando And Romano Milanese
  • Type Owner
    Owner Grace Markham

Comments on the production information

  • FIGURES LACKING; ONLY SMALL PRODUCTION OF LOW QUALITY MICA FROM LOW GRADE MICA DEPOSITS. PRODUCED MICA CONCENTRATES.

Comments on the reserve resource information

  • FIGURES LACKING BUT ONLY SMALL AMOUNTS OF LOW QUALITY MICA AVAILABLE FROM VERY LOW GRADE DEPOSITS.

Workings at the site

  • Type of workings Surface
    Overall length 7.62M
    Overall width 3.66M

Comments on development

  • TOTAL$: US

Reference information

Bibliographic references

  • Deposit

    RODGERS, J., 1959, EXPLANATORY TEXT FOR GEOL. MAP CONN.," CONN GEOLOGICAL SURVEY , BULL. 84, MAP, TEX

  • Production

    CAMERON, 1954

  • Reserve-Resource

    CAMERON

General comments

Subject category Comment text
Deposit STUGARDS' MAP AT 1:24000 LOCATES QUARRIES AND PEGMATITE DIKES. STUGARD CITES GEOCHRON AGE DATES OF ABOUT 270 M.Y. FOR SIMILAR PEGMATITE DIKES, PAGE 651. ; INFO.SRC : 1 PUB LIT

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAY-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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