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Kloof Mine

Producer in South Africa with commodities Gold, PGE, Silver, Sulfur-Pyrite, Sulfur, Sulfuric Acid
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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. 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. Land status
  16. Ownership information
  17. Production statistics
  18. Reserves and resources
  19. Workings at the site
  20. Links to other databases
  21. Bibliographic references
  22. General comments
  23. Reporter information

Geologic information

Identification information

Deposit ID 10079045
MRDS ID W027860
Record type Site
Current site name Kloof Mine

Geographic coordinates

Geographic coordinates: 27.60146, -26.3966 (WGS84)
Elevation 1676
Relative position 11 KILOMETERS SOUTHWEST OF WESTONARIA; 13 KILOMETERS NORTHEAST 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
PGE Critical Secondary
Silver Secondary
Sulfur-Pyrite Tertiary
Sulfur, Sulfuric Acid Tertiary

Comments on the commodity information

  • NO URANIUM POTENTIAL. PYRITE (AND SULFURIC ACID) NOT CURRENTLY RECOVERED. 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.

Mineral occurrence model information

Model code 193
USGS model code 29a
Deposit model name Quartz pebble conglomerate Au-U (BC name is Paleoplacer U-Au-PGE-Sn-Ti

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) 27.60146, -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.
Type of structure Local
Structure description Steeply Dipping Compared To Most Other Measured Occurrences In This General Area. Faulting Limited, But Minor Folding And Notable Undulation Of The Beds Are Characteristic Locally. Intrusive Dikes Penetrate And Dilute Minable Ore Horizons. A Well-Marked, And Incompetent, Tuff Overlies The Ventersdorp Contact Reef. Lavas And Dolomites Are Massive.

Ore body information

  • General form TABULAR/BLANKET
    Strike NE - SW
    Dip 35 DEG. SE
    Thickness 3M
    Depth to top 1400M
    Depth to bottom 2500M

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 Limited
Year of first production 1968

Mining district

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

Land status

Ownership category Private

Ownership information

  • Type Operator
    Owner Kloof Gold Mining Co. Ltd.
  • Type Owner
    Owner Goldfields Of South Africa - 30.1% And Other, Minority Shareholders

Production statistics

  • Year 1977
    Material AU
    Accuracy Accurate
    Description Ap_Grade: ^0.483 Toz Au/Met Ton Ore Milled
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Gold Gold 0g/mt
  • Year 1977
    Material ORE AU
    Accuracy Accurate
    Description Ap_Grade: ^0.401 Toz Au/Met Ton Of Ore Milled
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Ore Gold Gold 0g/mt
  • Year 1978
    Material ORE AU
    Accuracy Accurate
    Description Ap_Grade: ^0.480 Toz Au/Met Ton Ore Milled
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Ore Gold Gold 0g/mt
  • Year 1978
    Material AU
    Accuracy Accurate
    Description Ap_Grade: ^0.489 Toz Au/Met Ton Ore Milled
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Gold Gold 0g/mt
  • Year 1979
    Material AU
    Accuracy Accurate
    Description Ap_Grade: ^0.466 Toz Au/Met Ton 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: ^0.450 Toz Au/Met Ton Ore Milled
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Ore Gold Gold 0g/mt
  • Year 1980
    Material ORE AU
    Accuracy Accurate
    Description Ap_Grade: ^0.481 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: ^0.499 Toz Au/Met Ton Ore Milled
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Gold Gold 0g/mt
  • Year 1981
    Material AU
    Accuracy Accurate
    Description Ap_Grade: ^0.434 Toz Au/Met Ton Ore Milled
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Gold Gold 0g/mt
  • Year 1981
    Material ORE AU
    Accuracy Accurate
    Description Ap_Grade: ^0.464 Toz Au/Met Ton Ore Milled
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Ore Gold Gold 0g/mt
  • Year 1986
    Period 1986
    Material ORE
    Description Cp_Grade: ^Ventersdorp Reef - 0.649 To2 Au/Met Ton
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Ore Gold Gold 1g/mt

Comments on the production information

  • FIRST YEAR OF PRODUCTION: 1968 ; PRODUCTION WAS REDUCED IN 1983 AS A RESULT OF A FIRE

Reserves and resources

  • Type In-situ
    Name VENTERSDORP REEF
    Estimate year 1986
    Total resources 635000000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 20.186 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 ; CHAMBER OF MINES ANALYSIS OF WORKING RESULTS-1986

Workings at the site

  • Type of workings Underground
    Overall depth 2500M

Comments on the workings information

  • APPROX. MAXIMUM MINING DEPTH DOWN-DIP ON VENTERSDORP CONTACT REEF. STEEP DIP AND WEAK HANGING WALL REQUIRES MODIFIED "FACE-AND-STRIKE" SCRAPING. MINING PANELS ARE 20 METERS IN LENGTH WITH A 5-METER LEAD BETWEEN PANELS. ORE IS CLEANED FROM THE FACE VIA STRIKE GULLY AND CENTER GULLY SLUSHING. TIMBER/CONCRETE CRIB SUPPORTS EXTENSIVE.

Comments on development

  • TOTAL$: 146.9 ; MILL.CAP: 2.0 MIL. MET. T/YR. ; ECON.YEAR: 1968 ; ECON.COM: MINE OPERATES 3 REEFS AND HAS A MILLING RATE OF 180,000 TONS PER MONTH

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

    MERTIE, 1969, ECONOMIC GEOLOGY OF THE PLATINUM METALS: U.S. GEOLOGICAL SURVEY PROFESSIONAL PAPER 630.

  • Deposit

    MINING JOURNAL, 1977, DEVELOPMENT AND MILLING: V. 288.

  • Deposit

    PARK AND MACDIARMID, 1970, ORE DEPOSITS: FREEMAN AND CO.

  • Deposit

    KLOOF GOLD MINING COMPANY, 1977, ANNUAL REPORTS.

  • Deposit

    KLOOF GOLD MINING COMPANY, 1976, ANNUAL REPORTS.

  • Deposit

    KLOOF GOLD MINING COMPANY, 1975 ANNUAL REPORTS.

  • Deposit

    KLOOF GOLD MINING COMPANY, 1974, ANNUAL REPORTS.

  • Deposit

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

  • Deposit

    KLOOF GOLD MINING COMPANY, COMPANY HISTORY.

  • Deposit

    KLOOF GOLD MINING COMPANY, COMPANY GEOLOGY AND MINING PLAN.

  • Production

    CHAMBER OF MINES OF SOUTH AFRICA ; CHAMBER OF MINES ANALYSIS OF WORKING RESULTS - 1984 ; 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 ANALYSIS OF WORKING RESULTS-1982 ; CHAMBER OF MINES ANALYSIS OF WORKING RESULTS-1983 ; 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 MAX. STOPING WIDTH OF VENTERSDORP CONTACT REEF (AVE. REEF THICKNESS NOT AVAILABLE). DEPTH TO TOP IS UP-DIP SUB-CONTACT OF THE REEF. DEPTH TO BOTTOM IS APPROX. MAXIMUM MINING DEPTH (1977) DOWN-DIP. ADDITIONALLY, THE MAIN REEF HAS BEEN IDENTIFIED BETWEEN THE 2,900 AND 3,300 M LEVELS NEAR THE CURRENT BOTTOM OF THE MINE'S NO. 2 SUB-VERTICAL SHAFT. THE MAIN REEF IS NOT BEING WORKED AT THE PRESENT TIME.
Deposit THIS RECORD INCLUDES DATA FROM DUPLICATE RECORD M046860 WHICH AHS BEEN DELETED FROM MRDS.
Deposit INFORMATION MERGED FROM RECORD NUMBER W028689 ; W028714 ; W030761 ; W032333 ; W032927 ; W033072 ; W033779 ; W044644 ; W055282

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-JUL-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-MAY-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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