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Mt. Monadnock Area Sillimanite Deposits

Occurrence in Cheshire county in New Hampshire, United States with commodity Kyanite
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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. Alteration
  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. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10069796
MRDS ID W007485
Record type Site
Current site name Mt. Monadnock Area Sillimanite Deposits

Geographic coordinates

Geographic coordinates: -72.11616, 42.86664 (WGS84)

Site location context

Political divisions (FIPS codes)

Cheshire(county)

New Hampshire(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Monadnock Mountain(quadrangle 1:24,000 scale)

Keene(quadrangle 1:100,000 scale)

Albany(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Ashuelot River-Connecticut River(hydrologic unit)

Lower Connecticut(hydrologic accounting unit)

Connecticut(hydrologic subregion)

New England(hydrologic region)

Geographic areas

Country State County
United States New Hampshire Cheshire

Commodities

Commodity Importance
Kyanite Tertiary

Materials information

Materials Type of material
Sillimanite Ore

Alteration

  • (Local) Muscovite

Analytical data

Result UP TO 20% SILLIMANITE

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Quartz Monzonite
    Rock unit name Concord Granite
    Rock description Concord Granite
    Stratigraphic age (youngest) Early Permian
    Stratigraphic age (youngest) Early Devonian
    Stratigraphic age (youngest) Late Devonian
    Stratigraphic age (youngest) Early Devonian
  • Host or associated Associated
    Rock type Metamorphic Rock > Gneiss
  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Granite
  • Host or associated Host
    Rock type Metamorphic Rock > Schist
    Rock unit name Littleton Formation-Sillimanite-Mica-Quartz Schist, Quartzite
    Rock description Littleton Formation-Sillimanite-Mica-Quartz Schist, Quartzite

Nearby scientific data

(1) -72.11616, 42.86664
ListMap

Economic information

Ore body information

  • General form IRREGULAR
    Length 804.65M

Economic information about the deposit and operations

Development status Occurrence
Commodity type Non-metallic
Deposit size Small
Significant No

Mining district

District name Mt. Monadnock And Vicinity

Comments on the workings information

  • ONE BELT SEVERAL HUNDRED FT WIDE

Comments on development

  • UNDEVELOPED

Reference information

Bibliographic references

  • Deposit

    FOWLER - BILLINGS, K. S., 1944, SILLIMANITE DEPOSITS IN THE MONADNOCK QUADRANGLE: NEW HAMPSHIRE STATE PLAN AND DEVEL. COMM. PT. 8

General comments

Subject category Comment text
Deposit GEOLOGIC MAPPING ADEQUATE ; INFO.SRC : 1 PUB LIT

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAR-1959 Espenshade, Gilbert H. U.S. Geological Survey

Beyond USGS

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

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