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Gardner Hill Mine

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

Geologic information

Identification information

Deposit ID 10026443
MRDS ID K005072
Record type Site
Current site name Gardner Hill Mine
Related records 10272756, 10296882

Geographic coordinates

Geographic coordinates: -79.89117, 35.98759 (WGS84)
Relative position 8.1 MI SOUTHWEST OF GREENSBORO AND 2.6 MI EAST-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

High Point East(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

Comments on the commodity information

  • SULPHIDES APPEAR AS BLEBS AND CRYSTALS IN QUARTZ AND ARE MINOR TO THE AMOUNT OF GANGUE

Materials information

Materials Type of material
Chalcopyrite Ore
Gold Ore
Malachite Ore
Chlorite Gangue
Limonite Gangue
Magnetite Gangue
Sericite Gangue

Alteration

  • (Local) Sericite, Chlorite, Calcite

Analytical data

Result GOLD 1 OPT IN THE OXIDIZED ZONE. COPPER UP TO 30 %.

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

Nearby scientific data

(1) -79.89117, 35.98759
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Three Ne-Trending Shear Zones

Ore body information

  • General form TABULAR AND PODS
    Strike N 20 DEG E
    Dip 25 DEG
    Plunge direction W
    Length 1500M
    Width 2M
    Depth to bottom 79M

Controls for ore emplacement

  • Quartz Vein In Shear Zones

Comments on the geologic information

  • GNEISSIC DIORITE IS INTRUDED BY HORNBLENDE GRANITE, THEN BIOTITE GRANITE. MINERALIZED SHEAR ZONES CUT THE GNEISSIC FOLIATION AT A STEEP ANGLE; BOTH DIP TOWARD THE NORTHWEST. QUARTZ VEINS ARE LOCALLY SHEARED AND BRECCIATED; SCHISTOSITY IN WALL ROCKS MAY SHOW DRAG ALONG THE STRUCTURED QUARTZ VEINS. DIORITE HOST ROCK TO QUARTZ VEINS IS CHLORITICALLY AND SERICITICALLY ALTERED AND SHEARED. SULFIDES ARE DISSEMINATED IN QUARTZ OR ARE BANDED ROUGHLY PARALLEL TO VEIN WALLS. CHLORITE AND SERICITE FILL FRACTURES IN THE QUARTZ VEINS. TWO GENERATIONS OF CARBONATE VEINS; ONE CONTEMPORANEOUS WITH QUARTZ VEINS, THE OTHER LATER THAN QUARTZ VEINING. THREE VEINS WERE REPORTED ON THE PROPERTY. ONE VEIN WAS COMPLETELY WORKED OUT, AND LITTLE IS KNOWN ABOUT A THIRD, SMALLER VEIN. ORE BODIES WERE 1 FT. TO 6 FT. OR MORE IN THICKNESS, AND ONE WAS 60 TO 120 FT LONG AND 270 FT. OR MORE IN DEPTH.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Medium
Significant No
Discovery year 1856
Year of first production 1857
Year of last production 1865

Mining district

District name Guilford County Copper District

Production statistics

  • Year 1856
    Period To 1856
    Accuracy Estimate
    Description Cp_Grade: ^0.5-1.0 Oz/Ton
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 21g/mt

Comments on the production information

  • COPPER PRODUCTION WAS SIGNIFICANT BELOW WATER LEVEL. PRODUCED 40 TONS OF CONCENTRATE (20-25% CU) PER WEEK

Comments on the reserve resource information

  • STOPES WORKED OUT TO LOWEST LEVEL (228 FT) BY 1896 (LUTTRELL, 1978).

Workings at the site

  • Type of workings Underground
    Length 600M
    Overall depth 79M
    Overall length 1371.6M

Comments on the workings information

  • SIX SHAFTS WERE OPENED ON THE PROPERTY INCLUDING THE CREEK SHAFT, 110 FT. DEEP; THE UNDERLAY SHAFT, 175 FT. DEEP; THE OLD ENGINE SHAFT, 175 FT. DEEP; THE NEW ENGINE SHAFT, 258 FT. DEEP; THE NO. 2 SHAFT, 110 FT. DEEP; AND THE WHITE OAK SHAFT, 150 FT DEEP. THERE WERE FOUR LEVELS AVERAGING 500 FT IN LENGTH. THE QUARTZ VEIN CONTAINING THE MINERALIZATION IS RARELY OVER 3 FT. WIDE. 3 VEINS WERE REPORTED. ONE VEIN COMPLETELY WORKED OUT, AND LITTLE KNOWN ABOUT A THIRD SMALLER VEIN.

Comments on development

  • MINE WAS MOST PRODUCTIVE IN THE PERIOD JUST PRIOR TO 1856.

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit THREE VEINS ON PROPERTY. EARLY MINING PRODUCED GOLD FROM THEuOXIDIZED ZONE WHICH USUALLY EXTENDED TO ABOUT 15 M. COPPERuCONCENTRATIONS BELOW WEATHERING WERE AS HIGH AS 30 %.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUL-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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