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Doornfontein

Producer in South Africa with commodities Gold, Sulfur-Pyrite, Sulfur, Sulfuric Acid, PGE, Silver, Uranium
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Alteration
  7. Host and associated rocks
  8. Nearby scientific data
  9. Geologic structures
  10. Ore body information
  11. Controls for ore emplacement
  12. Economic information about the deposit and operations
  13. Mining district
  14. Land status
  15. Ownership information
  16. Production statistics
  17. Reserves and resources
  18. Workings at the site
  19. Links to other databases
  20. Bibliographic references
  21. General comments
  22. Reporter information

Geologic information

Identification information

Deposit ID 10079048
MRDS ID W027863
Record type Site
Current site name Doornfontein

Geographic coordinates

Geographic coordinates: 27.30146, -26.3966 (WGS84)
Elevation 1646
Relative position 11 KILOMETERS SOUTHWEST OF CARLETONVILLE; 21 KILOMETERS NORTHWEST OF FOCHVILLE

Site location context

Political divisions (FIPS codes)

South Africa(country)

Africa(continent)

Land(continent)

Geographic areas

Country
South Africa

Commodities

Commodity Importance
Gold Primary
Sulfur-Pyrite Secondary
Sulfur, Sulfuric Acid Secondary
PGE Critical Secondary
Silver Secondary
Uranium Tertiary

Comments on the commodity information

  • A MEDIUM GRADE GOLD PRODUCER. URANIUM CONTENT, IN CARBON LEADER REEF ONLY, IS LOW GRADE AND NOT CURRENTLY EXPLOITED. PYRITE RECOVERED FOR SULFURIC ACID. NEITHER QUANTITIES NOR VALUES AVAILABLE. SMALL QUANTITIES PT AND AG RECOVERED BUT UNIMPORTANT IN SOUTH AFRICA TERMS. PT IS AN IMPURITY IN GOLD AND IS RECOVERED AT THE RAND REFINERY AS A CONSEQUENCE OF THE PURIFICATION PROCESS.

Alteration

  • (Local) None

Analytical data

Result SEE PRODUCTION ENTRIES

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic)
    Rock unit name Ventersdorp System-Lava
    Rock description Ventersdorp System-Lava
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Neoproterozoic
  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Quartzite
    Rock unit name Transvaal System Shales (Pretoria Series), Dolomite (Dolomite Series) And Conglomerates (Black Reef Series);Witwatersrand System (Upper Division)-Quartzites, Shales, Grits, Conglomerates And Carbon Granules
    Rock description Transvaal System Shales (Pretoria Series), Dolomite (Dolomite Series) And Conglomerates (Black Reef Series);Witwatersrand System (Upper Division)-Quartzites, Shales, Grits, Conglomerates And Carbon Granules
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Shale
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Conglomerate

Nearby scientific data

(1) 27.30146, -26.3966
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Unique Continuity Of Gold-Bearing Horizons Over Extended Area, Though Well Marked By Dikes, Faulting, Early Erosion And Redeposition Of Overlying Sediments. The Ventersdorp Contact Reef Unconformably Overlies The Carbon Leader Reef.
Type of structure Local
Structure description Gentle Dip With Faulting Locally, And Minor Folding. Intrusive Dikes Penetrate And Dilute Minable Ore Horizons. Overlying Lavas And Dolomites Are Massive.

Ore body information

  • General form TABULAR/BLANKET
    Strike E - W
    Dip 22 DEG. S.
    Thickness 0.3M
    Depth to top 1100M
    Depth to bottom 2600M

Controls for ore emplacement

  • Gentle Uplift Of Continental Mass; Erosion; Peneplanation; Folding; Faulting; Volcanicity; Dike Injection And Build-Up Of Younger Sediments

Economic information about the deposit and operations

Development status Producer
Commodity type Both
Deposit size Large
Significant No
Discovery year 1932
Discoverer Dr. R. Krahmann, West Witwatersrand Areas Ltd
Year of first production 1954

Mining district

District name Far West Rand (West Wits Line) Of Witwatersrand Goldfields

Land status

Ownership category Private

Ownership information

  • Type Operator
    Owner Doornfontein Gold Mining Co. Ltd.
  • Type Owner
    Owner Goldfields Of South Africa - 33 Percent.

Production statistics

  • Year 1977
    Material ORE AU
    Accuracy Accurate
    Description Ap_Grade: ^0.296 Toz Au /Met Ton Of Ore Milled
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Ore Gold Gold 0g/mt
  • Year 1977
    Material AU
    Accuracy Accurate
    Description Ap_Grade: ^0.270 Toz Au/Met Ton Ore Milled
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Gold Gold 0g/mt
  • Year 1978
    Material AU
    Accuracy Accurate
    Description Ap_Grade: ^0.218 Toz Au/Met Ton Ore Milled
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Gold Gold 0g/mt
  • Year 1978
    Material ORE AU
    Accuracy Accurate
    Description Ap_Grade: ^0.423 Toz Au/Met Ton Ore Milled
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Ore Gold Gold 0g/mt
  • Year 1979
    Material AU
    Accuracy Accurate
    Description Ap_Grade: ^0.272 Au Mt Ore Milled
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Gold Gold 0g/mt
  • Year 1979
    Material ORE AU
    Accuracy Accurate
    Description Ap_Grade: ^0.281 Toz Au/Met Ton Ore Milled
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Ore Gold Gold 0g/mt
  • Year 1980
    Material AU
    Accuracy Accurate
    Description Ap_Grade: ^0.215 Toz Au/Met Ton Ore Milled
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Gold Gold 0g/mt
  • Year 1980
    Material ORE AU
    Accuracy Accurate
    Description Ap_Grade: ^0.238 Toz Au/Met Ton Ore Milled
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Ore Gold Gold 0g/mt
  • Year 1981
    Material ORE AU
    Accuracy Accurate
    Description Ap_Grade: ^0.209 Toz Au/Met Ton Ore Milled
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Ore Gold Gold 0g/mt
  • Year 1981
    Material AU
    Accuracy Accurate
    Description Ap_Grade: ^0.190 Toz Au/Met Ton Ore Milled
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Gold Gold 0g/mt
  • Year 1986
    Period 1986
    Material ORE
    Description Cp_Grade: ^Main Reef 0.219 Toz Au/Met Ton Ore
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Ore Gold Gold 0g/mt
  • Year 1986
    Period 1986
    Material ORE
    Description Cp_Grade: ^Carbon Leader 0.331 Toz Au/Met Ton Ore
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Ore Gold Gold 0g/mt
  • Year 1986
    Period 1986
    Material ORE
    Description Cp_Grade: ^0.331 T02 Au/Met Ton - Carbon Leader Reef And 0.219 T02 Au/Met Ton Ore - Main Reef.
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Ore Gold Gold 0g/mt

Comments on the production information

  • PYRITE AND SULFURIC ACID OUTPUT NOT AVAILABLE

Reserves and resources

  • Type In-situ
    Name CARBON LEADER REEF
    Estimate year 1986
    Total resources 6005000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 10.295 g/mt Gold Major 1986

Comments on the reserve resource information

  • CHAMBER OF MINES OF SOUTH AFRICA - 1986 ; CHAMBER OF MINES ANALYSIS OF WORKING RESULTS - 1984 ; CHAMBER OF MINES ANALYSIS OF WORKING RESULTS - 1985

Workings at the site

  • Type of workings Underground
    Overall depth 2600M

Comments on the workings information

  • APPROX. MAXIMUM MINING DEPTH DOWN-DIP ON CARBON LEADER REEF.

Comments on development

  • ECON.COM: A MODERN AND SOPHISTICATED MINING OPERATION WITH COSTS IN THE 'MEDIUM' RANGE ($115.85/TROY OUNCE OF GOLD RECOVERED; 1977). THE MINE CURRENTLY OPERATES FROM ONE HORIZON ONLY; THE CARBON LEADER REEF. LARGE EROSIONAL CHANNEL HAS ELIMINATED CARBON LEADER REEF IN WESTERN SECTION OF THE MINE.

Reference information

Bibliographic references

  • Deposit

    MINERAL RESOURCES OF THE REPUBLIC OF SOUTH AFRICA, FIFTH EDITION, HANDBOOK 7 ; 1976

  • Deposit

    MINERAL RESOURCES OF SOUTH-CENTRAL AFRICA; PELLETIER, R.A.; 1964

  • Deposit

    GOLD FIELDS OF SOUTH AFRICA LIMITED, ANNUAL REPORTS 1974 - 1977

  • Deposit

    DOORNFONTEIN ANNUAL REPORT, 1977.

  • Deposit

    DOORNFONTEIN ANNUAL REPORT, 1976.

  • Deposit

    DOORNFONTEIN ANNUAL REPORT,1975.

  • Deposit

    DOORNFONTEIN ANNUAL REPORT, 1974.

  • Deposit

    IVOR JONES, ROY & COMPANY, INC., 1975, SOUTH AFRICAN GOLD SHARES: JOHANNESBURG, IVOR JONES, ROY & COMPANY, INC.

  • Production

    CHAMBER OF MINES OF SOUTH AFRICA ; CHAMBER OF MINES ANALYSIS OF WORKING RESULTS - 1985 ; CHAMBER OF MINES ANALYSIS OF WORKING RESULTS-1986 ; CHAMBER OF MINES OF SOUTH AFRICA - ANALYSIS OF WORKING RESULTS - 1981 ; CHAMBER OF MINES OF SOUTH AFRICA - ANALYSIS OF WORKING RESULTS-1982 ; CHAMBER OF MINES ANALYSIS OF WORKING RESULTS - 1984 ; ANALYSIS OF WORKING RESULTS, CHAMBER OF MINES OF SOUTH AFRICA. JANUARY - DECEMBER 1979 ; ANALYSES OF WORKING RESULTS, CHAMBER OF MINES OF SOUTH AFRICA - 1980 ; ANALYSIS OF WORKING RESULTS, CHAMBER OF MINES OF SOUTH AFRICA. JANUARY - DECEMBER 1978

General comments

Subject category Comment text
Deposit MAX THICKNESS REFERS TO CARBON LEADER REEF ONLY. DEPTH TO TOP IS UPDIP SUB-CONTACT OF CARBON LEADER REEF NORTH OF ANNAN SHAFT. DEPTH TO BOTTOM IS APPROX MAXIMUM MINING DEPTH (CARBON LEADER REEF) DOWN-DIP AND SOUTH OF 1A SUB-VERTICAL SHAFT.
Deposit INFORMATION MERGED FROM RECORD NUMBER W028692 ; W028719 ; W030956 ; W032322 ; W032940 ; W033146 ; W033764 ; W044632 ; W055265

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAR-1978 Sweetwood, Charles W. Department of State
Updater 01-JUL-1987 Mccarter, Lorna D Department of State
Updater 01-APR-1980 Sweetwood, Charles W. Department of State
Updater 01-JUL-1981 Mccarter, Lorna D. Department of State
Updater 01-AUG-1982 Mccarter, Lorna D. Department of State
Updater 01-JUN-1984 Mccarter, Lorna D. Department of State
Updater 01-JUL-1983 Mccarter, Lorna D. Department of State
Updater 01-JUN-1985 Mccarter, Lorna D Department of State
Updater 01-MAR-1986 Mccarter, Lorna D Department of State
Updater 01-JUN-1987 Mccarter, Lorna D. Department of State

Beyond USGS

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

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