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Cofer

Prospect in Louisa county in Virginia, United States with commodities Copper, Sulfur-Pyrite, Sulfur, Sulfur, Sulfuric Acid, Zinc
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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. Nearby scientific data
  8. Ore body information
  9. Economic information about the deposit and operations
  10. Mining district
  11. Mineral rights holdings
  12. Land status
  13. Ownership information
  14. Workings at the site
  15. Links to other databases
  16. Bibliographic references
  17. Reporter information

Geologic information

Identification information

Deposit ID 10300823
MRDS ID w031306
MAS/MILS ID 0511090051
Record type Site
Current site name Cofer

Geographic coordinates

Point of reference Ore Body
Geographic coordinates: -77.8775, 38.0503 (WGS84)
Elevation 122
Location accuracy 100(meters)

Site location context

Political divisions (FIPS codes)

Louisa(county)

Virginia(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Mineral(quadrangle 1:24,000 scale)

Fredericksburg(quadrangle 1:100,000 scale)

Washington(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Pamunkey(hydrologic unit)

Lower Chesapeake(hydrologic accounting unit)

Lower Chesapeake(hydrologic subregion)

Mid Atlantic(hydrologic region)

Geographic areas

Country State County
United States Virginia Louisa

Commodities

Commodity Importance
Copper Primary
Sulfur-Pyrite Tertiary
Sulfur Primary
Sulfur, Sulfuric Acid Tertiary
Zinc Critical Primary

Materials information

Materials Type of material
Arsenopyrite Unknown
Bismuth Unknown
Chalcopyrite Unknown
Electrum Unknown
Galena Unknown
Pyrite Unknown
Pyrrhotite Unknown
Quartz Unknown
Sericite Unknown
Sphalerite Unknown
Tetrahedrite Unknown

Economic information

Ore body information

  • Strike N33E
    Dip 65S
    Thickness 8.1M
    Length 209M
    Width 209M
    Area 4HA
    Depth to top 100M
    Field Value
    Type of Orebody #1 DISSEMINATED
    Shape of Orebody #1 LENTICULAR
    Type of Orebody #2 REPLACEMENT
    Shape of Orebody #2 MASSIVE
    Primary mode of Origin HYDROTHERMAL
    Secondary mode of Origin CONT METASOMATIC
    Primary Ore Control FOLDING
    Secondary Ore Control BEDDING
    Degree of Wallrock Alter. SLIGHT
    Type of Wallrock Alter. #1 SERICITIC
    Strike And Dip N33E:65S
    Minimum Depth to Top 10
    Total Surface Area (HA) 4
    Date of Last Modification 810302

Economic information about the deposit and operations

Operation type Underground
Development status Prospect
Commodity type Both
Significant Yes
Discovery year 1965
Mining method Shrinkage Methods - Overhand Shrinkage

Mining district

District name Virginia Gold Pyrite

Mineral rights holdings

Type of mineral rights Fee Ownership

Land status

Ownership category Private

Ownership information

  • Type Owner
    Owner Gulf Western Inc.
    Interest 100
    Home office Colorado
    Year 1993

Comments on the production information

  • MILL INVESTMENT IS THE REPEATED COST OF THE ORIGINAL ARMINIUS MILL INVESTMENT.
  • EXACT RECOVERY FOR ZN IN ZNSO4 IS 101.0 PERCENT. RECOVERY FOR ZN IN ZNSO4 IS GREATER THAN 100 PERCENT BECAUSE SOME OF THE ZINC ADDED AS A REAGENT IS RECOVERED. EXACT RECOVERY FOR CU IS 95.94 PERCENT. EXACT RECOVERY FOR S IN H2SO4 IS 53.2 PERCENT. EXACT RECOVERY FOR S IN SO2 IS 18.6 PERCENT.

Workings at the site

  • Type of workings Underground
    Length 950M
    Overall depth 50M
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method PROPOSED
    Mining Method OVERHAND SHRINKAGE 10-67
    Percent Recovery 90
    Hardness of Rock HARDROCK FISSURED WITH MODERATE WATER
    Rock Characteristics ONE SYSTEM OF WEAKNESS PLANES
    Rock Support Chars. SUPPORTING MAY BACK SLAB
    Mine Support Chars. TIMBER
    Number of Shafts 1
    Length of Inclines (m) 500
    Slope of Inclines 20
    Number of Inclines 1
    1st Condition of Workings FLOODED
    2nd Condition of Workings CAVED AT PORTAL
    Capacity 680
    Capacity Units MT ORE/DAY
    Unit Production Cost 18.2
    Units of Production $/MT ORE
    Operating Days per Year 350
    Operating Shifts per Day 2
    Year of Information 1981

Comments on the workings information

  • TOTAL LAND HOLDING IS 29.7 HECTARES.

Reference information

Bibliographic references

  • Deposit

    CALLAHAN MINING CORPORATION LETTER OF CORRESPONDENCE TO

  • Deposit

    R.C. BOWYER. SEPT. 8, 1980, P. 1,

  • Deposit

    PLUS ENCLOSURES, 2 PP.

  • Deposit

    CRAIG, J.R., J.W. MILLER, AND D.K. HENRY. COMPARISON

  • Deposit

    OF MASSIVE SULFIDE MINERALOGY AT GOSSAN LEAD WITH THE

  • Deposit

    COFER PROPERTY, LOUISA COUNTY, VIRGINIA. (ABSTR.):

  • Deposit

    VIRGINIA MINERALS, V. 23, 1974, P. 28.

  • Deposit

    HOOVER, A. SHRINKAGE STOPING. SME MINING ENGINEERING

  • Deposit

    HANDBOOK, VOL. 1, CHAPTER 12, 1973, PP. 135 - 140.

  • Deposit

    *LAKE, J.L. PROCESS FOR RECOVERY OF ZINC SULFATE,

  • Deposit

    SULFURIC ACID, LIQUID SO2, AND CATHODE COPPER FROM

  • Deposit

    ARMINIUS MINE ORE. CALLAHAN MINING CORPORATION,

  • Deposit

    NOVEMBER 1, 1978, 51 PP.

  • Deposit

    MILLER, J.W. THE ORE MINERALOGY OF THE COFER PROPERTY,

  • Deposit

    LOUISA COUNTY, VIRGINIA, A VOLCANOGENIC MASSIVE

  • Deposit

    SULFIDE DEPOSIT. M.S. DISSERTATION, VIRGINIA

  • Deposit

    POLYTECH. INST. AND STATE UNIV., 1978, PP. 1 - 10.

  • Deposit

    RYMPH, W.F. THE PETROGRAPHY OF THE HOST ROCK SEQUENCE

  • Deposit

    OF THE COFER DEPOSIT, MINERAL, VIRGINIA. B.S. PAPER,

  • Deposit

    UNIVERSITY OF WESTERN ONTARIO, 1977, 59 PP.

  • Deposit

    *COMPANY REPORTS CAN BE OBTAINED FROM CALLAHAN MINING

  • Deposit

    CORPORATION.

Comments on the references

  • REPORTS DESIGNATED AS HAVING BEEN PREPARED FOR A SPECIFIC COMPANY MAY BE OBTAINED ONLY FROM THAT COMPANY.

Reporter information

Type Date Name Affiliation Comment
Reporter 25-SEP-96 Dh-Tm U.S. Bureau of Mines

Beyond USGS

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

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