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Halfway Mica Mine

Past Producer in Warren county in New Jersey, United States with commodity Mica
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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. Economic information about the deposit and operations
  11. Land status
  12. Ownership information
  13. Workings at the site
  14. Links to other databases
  15. Bibliographic references
  16. Reporter information

Geologic information

Identification information

Deposit ID 10106366
MRDS ID W055042
Record type Site
Current site name Halfway Mica Mine

Geographic coordinates

Geographic coordinates: -75.0471, 40.74806 (WGS84)
Elevation 207

Site location context

Political divisions (FIPS codes)

Warren(county)

New Jersey(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Bloomsbury(quadrangle 1:24,000 scale)

Allentown(quadrangle 1:100,000 scale)

Newark(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Middle Delaware-Musconetcong(hydrologic unit)

Upper Delaware(hydrologic accounting unit)

Delaware-Mid Atlantic Coastal(hydrologic subregion)

Mid Atlantic(hydrologic region)

Geographic areas

Country State County
United States New Jersey Warren

Commodities

Commodity Importance
Mica Secondary

Materials information

Materials Type of material
Feldspar Gangue

Analytical data

Result IRON OXIDE 3.82%
Result MAGNESIUM OXIDE 12.72%
Result CALCIUM OXIDE TRACE (1926)

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Gneiss
  • Host or associated Host
    Rock type Plutonic Rock > Granitoid > Granite

Nearby scientific data

(1) -75.0471, 40.74806
ListMap

Economic information

Ore body information

  • Dip 60 WNW
    Length 60.96M
    Width 9.14M
    Depth to top 9.14M

Comments on the geologic information

  • MICA OCCURS IN GRANITIE VEINS WHICH CUT ACROSS THE STRATA OF THE GNEISS. THE MICA IS IN ENORMOUS CRYSTALS (MORE THAN 1 FOOT ACROSS) IMBEDDED IN DECOMPOSED FELDSPAR

Economic information about the deposit and operations

Development status Past Producer
Commodity type Non-metallic
Deposit size Small
Significant No
Discovery year 1871
Discoverer Clarkson Bird, Broadway, N.J.
Year of first production 1872
Year of last production 1915

Land status

Ownership category Private

Ownership information

  • Type Operator
    Owner Koehler, A. F. - Reopened During World War I
  • Type Owner
    Owner Hardiman, Ann
    Home office 263 Market St. Perth Amboy, Nj

Workings at the site

  • Type of workings Underground
    Overall depth 7.62M

Comments on the workings information

  • MUCH MICA IN WASTE PILES; ONE VERY LARGE SHAFT STILL VISABLE WITH LARGE HOLES NW & NE OF IT. OLD BUILDINGS DIRECTLY SOUTH OF MAIN SHAFT (1985) SHAFT WAS 25' DEEP; FULL OF WATER AND OVERFLOWING (1915)

Comments on development

  • H.W. MERRILL & CO OF PATERSON OWNED AND OPERATED THE MINE IN 1872

Reference information

Bibliographic references

  • Deposit

    FIELD CHECKED 1985

  • Deposit

    LEWIS, J.V. 1915, NEW JERSEY GEOLOGICAL SURVEY'S PERMENANT NOTES, ON FILE AT NJGS, TRENTON

  • Deposit

    COOK, GEO. H. 1872, ANNUAL REPORT OF THE STATE GEOLOGIST OF NEW JERSEY FOR THE YEAR 1872, PG 31

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JAN-1986 Simonds, Raymond E. (Bell, Christy A.) New Jersey Bureau of Geology and Topography

Beyond USGS

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

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