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Theodora Copper Mine

Past Producer in Fairfax county in Virginia, United States with commodities 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. Alteration
  8. Host and associated rocks
  9. Nearby scientific data
  10. Geologic structures
  11. Economic information about the deposit and operations
  12. Land status
  13. Ownership information
  14. Links to other databases
  15. Bibliographic references
  16. General comments
  17. Reporter information

Geologic information

Identification information

Deposit ID 10082546
MRDS ID W055389
Record type Site
Current site name Theodora Copper Mine

Geographic coordinates

Geographic coordinates: -77.42302, 38.94975 (WGS84)
Elevation 96
Relative position 1.35 MILES E OF DULLES INTERNATIONAL AIRPORT TERMINAL

Site location context

Political divisions (FIPS codes)

Fairfax(county)

Virginia(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Herndon(quadrangle 1:24,000 scale)

Washington West(quadrangle 1:100,000 scale)

Washington(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Middle Potomac-Catoctin(hydrologic unit)

Potomac(hydrologic accounting unit)

Potomac(hydrologic subregion)

Mid Atlantic(hydrologic region)

Geographic areas

Country State County
United States Virginia Fairfax

Comments on the location information

  • INFO FROM LAND.ST :(1983)

Commodities

Commodity Importance
Copper Primary
Silver Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Epidote Gangue
Hematite Gangue
Quartz Gangue

Alteration

  • (Local) Contact Metasomatism Of Shale And Sandstone By Diabase Intrusion.

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite > Diabase
    Rock unit name Diabase
    Rock description Diabase
    Stratigraphic age (youngest) Late Triassic
    Stratigraphic age (youngest) Late Triassic
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Sandstone

Nearby scientific data

(1) -77.42302, 38.94975
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Ne-Sw Trend Culpeper Triassic Basin

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1879
Year of first production 1880

Land status

Ownership category Private

Ownership information

  • Type Operator
    Owner Rev. J. B. North

Comments on the workings information

  • COPPER ORE FROM SHAFT; WHEN VISITED IN 3/87, SOME MINE DUMPS ARE PRESENT IN A SMALL PATCH OF WOODS. COPPER MINERALS MALACHITE AND CRYSOCOLLA ARE EVIDENT. AZURITE, EPIDOTE, AND LIBETHENITE ARE REPORTEDLY PRESENT ON THE DUMPS.

Comments on development

  • ON MARCH 22, 1880, ONE CARLOAD OF ORE HAD BEEN SHIPPED TO BALTIMORE AND 6 MEN WERE WORKING IN THE SHAFT AT THAT TIME. SMELTER WOULD BE ERECTED SOON. AT THIS TIME A "RICH VEIN OF SILVER" WAS REPORTEDLY DISCOVERED.

Reference information

Bibliographic references

  • Deposit

    THE VIRGINIAS, 1880, COPPER VOL.1, NO.4, P.53

  • Deposit

    BERNSTEIN, L.R., 1980, MINERALS OF THE WASHINGTON, D.C. AREA, DEPT. OF NATURAL RESOURCES, MARYLAND GEOLOGICAL SURVEY, EDUCATIONAL SERIES NO.5, 148P.

General comments

Subject category Comment text
Deposit COPPER MINERALS IN FRACTURES AND VUGS

Reporter information

Type Date Name Affiliation Comment
Reporter 01-APR-1987 Sweet, Palmer C. Virginia Division of Mineral Resources

Beyond USGS

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

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