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Fentress Mine

Past Producer in Guilford county in North Carolina, United States with commodities Gold, Copper, Silver
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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. Geologic structures
  11. Ore body information
  12. Controls for ore emplacement
  13. Economic information about the deposit and operations
  14. Mining district
  15. Production statistics
  16. Workings at the site
  17. Links to other databases
  18. Bibliographic references
  19. General comments
  20. Reporter information

Geologic information

Identification information

Deposit ID 10102381
MRDS ID K005076
Record type Site
Current site name Fentress Mine
Alternate or previous names North Carolina Mine
Related records 10296573

Geographic coordinates

Geographic coordinates: -79.80921, 35.93898 (WGS84)
Relative position 9.3 MI SOUTH OF GREENSBORO AND 8.1 MILES SOUTHEAST OF JAMESTOWN.

Site location context

Political divisions (FIPS codes)

Guilford(county)

North Carolina(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Pleasant Garden(quadrangle 1:24,000 scale)

Chapel Hill(quadrangle 1:100,000 scale)

Raleigh(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Deep(hydrologic unit)

Cape Fear(hydrologic accounting unit)

Cape Fear(hydrologic subregion)

South Atlantic-Gulf(hydrologic region)

Geographic areas

Country State County
United States North Carolina Guilford

Commodities

Commodity Importance
Gold Primary
Copper Primary
Silver Tertiary

Comments on the commodity information

  • MINOR MALACHITE, TRACES OF CHALCOCITE, COVELLITE AND CUPRITE

Materials information

Materials Type of material
Chalcocite Ore
Chalcopyrite Ore
Covellite Ore
Cuprite Ore
Malachite Ore
Chlorite Gangue
Limonite Gangue
Sericite Gangue
Siderite Gangue

Analytical data

Result O.O3 OPT GOLD IN CARBONATE-RICH VEIN. 1.9 OPT GOLD AND 0.59 OPT SILVER IN PYRITE CONCENTRATE.

Mineral occurrence model information

Model code 273
USGS model code 36a
Deposit model name Low-sulfide Au-quartz vein
Mark3 model number 27

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Stratigraphic age (youngest) Late Permian
  • Host or associated Host
    Rock type Plutonic Rock > Granitoid > Granite

Nearby scientific data

(1) -79.80921, 35.93898
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Near The Milton Belt-Slate Belt Boundary

Ore body information

  • General form TABULAR
    Strike N 25 E
    Dip 38-60 W
    Length 500M
    Width 3M
    Depth to bottom 120M

Controls for ore emplacement

  • Quartz-Carbonate Veins

Comments on the geologic information

  • BIOTITE-MUSCOVITE GRANITE COUNTRY ROCK IS MEDIUM- TO FINE-GRAINED, CONTAINING NUMEROUSE MAFIC DIKES. VEINS CONSIST OF QUARTZ AND BROWN AND YELLOW SIDERITE WITH ABUNDANT CHLORITE AND SERICITE IN ADJACENT WALLROCKS. A HIGHLY FOLIATED DIORITE IS INTRUDED BY THE GRANITE. TWO GENRATIONS OF CARBONATE MINERALS, BOTH OLDER THAN THE QUARTZ VEINS. SULFIDES ARE PRIMARILY CONFINED TO FRACTURES IN QUARTZ AND SIDERITE VEINS ALTERNATELY ON THE HANGINGWALL AND THE FOOTWALL OF THE VEIN. SOME VEIN PARALLEL BANDING HAS BEEN NOTED. CHALCOPYRITE IS PARAGENETICALLY LATER THEN THE SIDERITE. WEATHERING HAS PRODUCED ANTLERITE OR BROCHANTITE IN SOME CAVITIES.u THE VEIN SYSTEM CAN BE TRACED FOR A DISTANCE OF ABOUT 5 KM, IN A N 25 Eu DIRECTION. VEIN DIPS RANGE FROM 38 TO 60 DEGREES TO THE WEST.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1853
Year of first production 1853
Year of last production 1935

Mining district

District name Guilford County Copper District

Production statistics

  • Year 1856
    Material CU
    Accuracy Estimate
    Description Ap_Grade: ^14-23 % Cu
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Copper Copper 19wt-pct

Comments on the production information

  • TOTAL PRODUCTION $175,000 GOLD AND COPPER.

Workings at the site

  • Type of workings Underground
    Length 500M
    Overall depth 122M
    Overall length 500M
    Overall width 1M

Comments on the workings information

  • THREE MAIN SHAFTS, THE ENGINE, WORTH, AND COLBY, WERE OPENED AT THE MINE. THE ENGINE SHAFT WAS OPENED TO A DEPTH OF 400 FT. WITH FOUR LEVELS TOTALING 300 TO 500 FT IN LENGTH. IN 1966 THREE SHAFTS WERE VISIBLE. AT THE SOUTHWEST END OF THE VEIN, THE ORE BODY WAS 3 TO 4 FT THICK AT A DEPTH OF 40 FT, AND AT THE NORTHEAST END, IT WAS 3 FT. THICK AT A DEPTH OF 55 FEET. AT A DEPTH OF 310 FT, THE VEIN WAS FROM 7 TO 13 FT WIDE BUT COPPER VALUES DID NOT INCREASE.

Comments on development

  • ORIGINALLY OPENED PRIOR TO 1853 AS A GOLD MINE, BUT AT A DEPTH OF APPROXIMATELY 50 FT. COPPER SULFIDES WERE ENCOUNTERED. DEPOSIT BECAME THE FIRST COPPER MINE IN THE STATE. TOTAL PRODUCTION AT THE MINE THROUGH 1935 HAS BEEN ESTIMATED AT $175,000. SOME EXPLORATION WAS BEING CARRIED OUT IN 1971 BY H. T. JACKSON AND BILL O'DANIEL WHO FORMED THE IRISH MINING AND EXPLORATION COMPANY. TWO DIAMOND DRILL HOLES WERE PUT DOWN, AND THE VEIN WAS INTERSECTED BELOW THE OLD WORKINGS.

Reference information

Bibliographic references

  • Analytical Data

    NITZE AND HANNA, 1896

  • Deposit

    CARPENTER, P. A., III, 1976, METALLIC MINERAL DEPOSITS OF THE CAROLINA SLATE BELT, NORTH CAROLINA: NORTH CAROLINA MINERAL RESOURCES SEC. BULL. 84, 166 P.

  • Deposit

    PARDEE, J. T., AND PARK, C. F., JR., 1948, GOLD DEPOSITS OF THE SOUTHERN PIEDMONT: U. S. GEOLOGICAL SURVEY PROF. PAPER 213, 156 P.

  • Deposit

    NITZE, H.B.C., AND HANNA, G.B., 1896, GOLD DEPOSITS OF NORTH CRAOLINA: NORTH CAROLINA GEOLOGICAL SURVEY BULLETIN 3, P. 111.

  • Production

    PARDEE AND PARK, 1948

General comments

Subject category Comment text
Deposit VEIN IS USUALLY ABOUT 1 METER THICK WITH ZONES OF SULFIDESuEITHER THE FOOTWALL OR THE HANGINWALL. THE LARGEST SULFIDE PODuWAS 25 M LONG AND 1 METER THICK ON THE 310 FOOT LEVEL.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JAN-1976 Mcdaniel, Ronald D. North Carolina Division of Land Resources
Updater 01-JUN-1991 Klein, T.L. U.S. Geological Survey

Beyond USGS

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

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