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Tollgate Mica-Feldspar Mine

Past Producer in Middlesex county in Connecticut, United States with commodities Feldspar, Mica, Niobium (Columbium), Tantalum
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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. Mineral occurrence model information
  8. Host and associated rocks
  9. Nearby scientific data
  10. Ore body information
  11. Economic information about the deposit and operations
  12. Mining district
  13. Workings at the site
  14. Links to other databases
  15. Bibliographic references
  16. General comments
  17. Reporter information

Geologic information

Identification information

Deposit ID 10067604
MRDS ID W000394
Record type Site
Current site name Tollgate Mica-Feldspar Mine
Related records 10167233

Geographic coordinates

Geographic coordinates: -72.61052, 41.53199 (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
Feldspar Primary
Mica Primary
Niobium (Columbium) Critical Primary
Tantalum Critical Primary

Comments on the commodity information

  • Owned By Earnest S. Bidwell. Mined Prior To 1896 For Feldspar and Mica. Mined Intermittently Between 1896 and 1926. Worked From 1943 To 1945 For Mica and Feldspar By Fausto Bertolini. Surface Workings 350 Feet Long N-S., 65 Feet Wide E-W., and About
  • OWNED BY EARNEST S. BIDWELL. MINED PRIOR TO 1896 FOR FELDSPAR AND MICA. MINED INTERMITTENTLY BETWEEN 1896 AND 1926. WORKED FROM 1943 TO 1945 FOR MICA AND FELDSPAR BY FAUSTO BERTOLINI. SURFACE WORKINGS 350 FEET LONG N-S., 65 FEET WIDE E-W., AND ABOUT 30 FEET DEEP. UNDERGROUND WORKINGS ARE TWO INCLINES EACH 45 FEET LONG AND TWO DRIFTS EACH 40 FEET LONG. PEGMATITE 500 FEET LONG, 4 INCHES TO 60 FEET IN THICKNESS WITH AVERAGE 20 TO 25 FEET. STRIKES N-S., DIPS 50 DEG. WEST.

Materials information

Materials Type of material
Tantalite Ore
Columbite Ore
Quartz Ore
Feldspar Ore
Muscovite Ore
Tourmaline Gangue
Garnet Gangue
Apatite Gangue
Biotite Gangue
Perthite Gangue

Mineral occurrence model information

Model code 33
USGS model code 13a
Deposit model name Be-Li pegmatites

Host and associated rocks

  • Host or associated Host
    Rock type Plutonic Rock > Pegmatite
    Stratigraphic age (youngest) Late Permian

Nearby scientific data

(1) -72.61052, 41.53199
ListMap

Economic information

Ore body information

  • Strike N-S
    Dip 50 DEG. W
    Thickness 18.29M
    Length 152.4M

Comments on the geologic information

  • Geol.Desc: Numerous Swarms of Northward Trending Pegmatite Dikes Present In North-South Zone; Most Swarms In Collins Hill Schist.
  • GEOL.DESC: NUMEROUS SWARMS OF NORTHWARD TRENDING PEGMATITE DIKES PRESENT IN NORTH-SOUTH ZONE; MOST SWARMS IN COLLINS HILL SCHIST.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Both
Significant No

Mining district

District name Middletown

Comments on the production information

  • FIGURES SHOW, MODERATE AMOUNTS OF ORE REMOVED. MICA BOOKS SPORADIC DUSTRIBUTION IN SMALL AMOUNTS.

Comments on the reserve resource information

  • FIGURES LACKING BUT PROBABLY LARGE AMOUNTS OF FELDSPAR AVAILABLE FROM PEGMATITE SWARM.

Workings at the site

  • Type of workings Surface/Underground
    Length 106.68M
    Overall depth 9.14M

Comments on development

  • TOTAL$: US

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit Cameron Shows Mine Map. Brookins' Gives Geochron Age Date of 254 M.Y. For Pegmatite. Report In USGS Files. ; Info.Src : 1 Pub Lit
Deposit Small Prod. of Feldspar and Mica ; Info.Src : 1 Pub Lit
Deposit CAMERON SHOWS MINE MAP. BROOKINS' GIVES GEOCHRON AGE DATE OF 254 M.Y. FOR PEGMATITE. REPORT IN USGS FILES. ; INFO.SRC : 1 PUB LIT

Reporter information

Type Date Name Affiliation Comment
Editor 10-MAR-2003 Nicholson, S.W. U.S. Geological Survey Combined This Record With Information From Record D001839: Then Deleted Record D001839
Reporter 01-APR-1972 D'Agostino, John P. U.S. Geological Survey
Reporter 01-APR-1975 Parker, Raymond L. U.S. Geological Survey
Updater 21-AUG-1997 Mchone, Nancy Connecticut Geological and Natural History Survey Added Model_Num And Model; Moved Point; Noted Duplicate Record Number D001839

Beyond USGS

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

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