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Naylor-Bruce Prospect

Occurrence in Albemarle county in Virginia, United States with commodity Graphite
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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. Geologic structures
  10. Ore body information
  11. Economic information about the deposit and operations
  12. Land status
  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 10096556
MRDS ID W031216
Record type Site
Current site name Naylor-Bruce Prospect

Geographic coordinates

Geographic coordinates: -78.59751, 38.20116 (WGS84)
Elevation 219
Relative position ABOUT 0.6 KM (1 MI) S 72 DEG W OF CROSSROADS.

Site location context

Political divisions (FIPS codes)

Albemarle(county)

Virginia(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Free Union(quadrangle 1:24,000 scale)

Charlottesville(quadrangle 1:100,000 scale)

Charlottesville(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Rivanna(hydrologic unit)

James(hydrologic accounting unit)

Lower Chesapeake(hydrologic subregion)

Mid Atlantic(hydrologic region)

Geographic areas

Country State County
United States Virginia Albemarle

Comments on the location information

  • OFF THE SOUTH SIDE OF A JEEP TRAIL 1.0 KM (0.6 MI) NW OF ITS INTERSECTION WITH STATE ROAD 671 AT A POINT ABOUT 1.4 KM (0.9 MI) SW OF CROSSROADS, VA. MINE IS ACROSS PINEY CREEK FROM THE JEEP TRAIL, AND IS ON A NORTHEAST SLOPE ABOUT 100 M SW FROM THE CREEK.

Commodities

Commodity Importance
Graphite Critical Primary

Comments on the commodity information

  • GRAPHITE IS CRYSTALLINE

Materials information

Materials Type of material
Graphite Ore
Andesine Gangue
Biotite Gangue
Quartz Gangue
Sericite Gangue

Analytical data

Result CRUDE ORE SHOWED 76.28% GRAPHITIC CARBON (ENGINEERING AND MINING JOURNAL, 1906).

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite > Diabase
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Late Permian
  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite
    Rock unit name Metaandesite Dike;Metabasalt (Diabase) Dike
    Rock description Metaandesite Dike;Metabasalt (Diabase) Dike
  • Host or associated Host
    Rock type Metamorphic Rock > Gneiss
    Rock unit name Layered Granulite Gneiss
    Rock description Layered Granulite Gneiss

Nearby scientific data

(1) -78.59751, 38.20116
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Ne-Sw Trend, Blue Ridge Anticlinorium
Type of structure Local
Structure description Overturned Syncline Trending N-S Lies About 650 M West Of The Mine. Granolite Strikes N 60 Deg. E And Dips 80 Deg Se.

Ore body information

  • General form IRREGULAR
    Dip 45 DEG. E.
    Width 2.4M
    Depth to top 0M

Comments on the geologic information

  • THE MINE LIES 30 M (100 FT) NW FROM A "DIABASE" DIKE WHICH STRIKES N 40 DEG E AND IS ABOUT 53 M (175 FT) WIDE (NELSON, 1962, P. 67). IN THIN-SECTION THE ROCK IS SEVERELY EPIDOTIZED AND COULD REPRESENT A METABASALT OR METADIABASE. THE GRANOBLASTITE HOST ROCK IS INTRUDED BY METAANDESITE DIKES AND A PEGMATITE (BASTIN, 1914) AND BECOMES MORE FRIABLE AS THE ZONE OF MINERALIZATION IS APPROACHED. THE FRIABILITY IS PROBABLY DUE TO A SHEAR ZONE. NORTH OF THE MINE GNEISSOSE HORNBLENDE CHARNO-ENDERBITIC GRANOLITE (HYPERSTHENE GRANODIORITE GRANULITE GNEISS) OUTCROPS.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Non-metallic
Deposit size Small
Significant No
Discovery year 1906

Land status

Ownership category Private

Ownership information

  • Type Operator
    Owner C. H. Hurkamp
  • Type Owner
    Owner W. A. Naylor

Workings at the site

  • Type of workings Surface/Underground
    Overall length 3.66M
    Overall width 4M

Comments on the workings information

  • A PIT MEASURING 4 M IN DIAMETER AND NARROWING AT DEPTH TO A MAXIMUM DEPTH OF 6 M, AND A FLOODED SHAFT WERE REPORTED IN MARCH 1964 (UNPUBLISHED VDMR FIELD REPORT).

Reference information

Bibliographic references

  • Deposit

    NELSON, W.A., 1962, GEOLOGY AND MINERAL RESOURCES OF ALBEMARLE COUNTY: VIRGINIA DIVISION OF MINERAL RESOURCES BULLETIN 77, 92 P.

  • Deposit

    ENGINEERING AND MINING JOURNAL, 1906, THE NAYLOR-BRUCE GRAPHITE COMPANY OF CHARLOTTESVILLE: V. 81, P. 768.

  • Deposit

    BASTIN, E.S., 1914, GRAPHITE, IN U.S. GEOLOGICAL SURVEY, MINERAL RESOURCES OF THE UNITED STATES, CALENDAR YEAR 1913, PART II-NONMETALS: P. 181-251.

  • Deposit

    BASTIN, E.S., 1917, GRAPHITE, IN U.S. GEOLOGICAL SURVEY, MINERAL RESOURCES OF THE UNITED STATES, 1915, PART II-NONMETALS: P. 81-93.

  • Deposit

    TYLER, P.M., 1929, GRAPHITE, PART II-DOMESTIC AND FOREIGN DEPOSITS: U.S. BUREAU OF MINES INFORMATION CIRCULAR 6122, 25 P.

  • Deposit

    1906 DIREXPL NAYLOR BRUCE GRAPHITE CO.: UNKNOWN RESULTS

  • Deposit

    1915 DIREXPL C.H. HURKAMP: PROSPECTING WAS PERFORMED BUT IT WAS NOT CARRIED FAR ENOUGH TO DETERMINE IF THE REMAINING ORE IS WORKABLE.

General comments

Subject category Comment text
Deposit VEINS VARY FROM 0.3 TO 2.4 M IN WIDTH AND ARE SEPARATED FROM WALLROCK BY CLAY SELVAGES.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-SEP-1979 Beaulieu, Harvey R. (Le Van, D. C.) U.S. Geological Survey

Beyond USGS

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

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