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Winkelhaak Mine

Producer in South Africa with commodities Gold, PGE, Osmium, Platinum, Iridium, Rhodium, Ruthenium, Silver, Subbituminous, Sulfur-Pyrite
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Geologic information

Identification information

Deposit ID 10078498
MRDS ID W026846
Record type Site
Current site name Winkelhaak Mine
Related records 10231829

Geographic coordinates

Geographic coordinates: 29.16811, -26.49658 (WGS84)
Elevation 1646
Relative position 6 KILOMETERS WEST OF THE TOWN OF TRICHARDT; 11 KILOMETERS SOUTHEAST OF THE TOWN OF KINROSS
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Geographic areas

Country
South Africa

Commodities

Commodity Importance
Gold Primary
PGE Secondary
Osmium Secondary
Platinum Secondary
Iridium Secondary
Rhodium Secondary
Ruthenium Secondary
Silver Secondary
Subbituminous Tertiary
Sulfur-Pyrite Tertiary

Comments on the commodity information

  • GOLD, ONLY, IS RECOVERED AT THIS OPERATION. A LOW GRADE PRODUCER, BUT WITH LONG MINE LIFE PROJECTED. AVAILABLE REPORTS DO NOT DESCRIBE PRESENCE OF COAL AT THIS PROPERTY, BUT SUBBITUMINOUS COAL KNOWN TO EXIST AT NEIGHBORING MINES AND GENERAL GEOLOGY SUGGESTS THAT IT MAY BE INCLUDED HERE AS WELL. 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.

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Pyrite Ore
Pyrrhotite Ore
Sphalerite Ore
Uraninite Ore

Alteration

  • (Local) None

Analytical data

Result PYRITE, WHEN PRESENT, IS USUALLY INDICATIVE OF HIGH GOLD CONTENT. NO KNOWN URANIUM POTENTIAL. COMPOSITION OF PLATINOIDS: IR = 34%, OS = 39.1%, RU = 12.5%, PT = 13.3%, RH = 1.1%

Mineral occurrence model information

Model code 193
USGS model code 29a
BC deposit profile C04
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 Ecca Series, Karroo System; Shale, Sandstone & Coal;Transvaal System--Dolomite;Witwatersrand System (Upper Division)-Quartzite, Shales, Grits And Conglomerates
    Rock description Ecca Series, Karroo System; Shale, Sandstone & Coal;Transvaal System--Dolomite;Witwatersrand System (Upper Division)-Quartzite, Shales, Grits And Conglomerates
  • 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) 29.16811, -26.49658
ListMap

Geologic structures

Type Description Terms
Regional Unique Continuity Of Gold-Bearing Horizons Over Extended Area, Though Well Marded By Folding, Faulting And (Locally) Erosion And Redeposition Of Overlying Conformable Sediments.
Local Synclinal Basin Separated From Central And East Rand Occurrences Of The Witwatersrand System. Unconformable Ecca Series, Karroo System Shales, Sandstones And Coal Are Not Notable. Dips Variable; Faulting Severe.

Ore body information

  • General form TABULAR/BLANKET
    Dip 20 DEG. N
    Thickness 1.38M
    Depth to bottom 1600M

Controls for ore emplacement

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

Economic information

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Deposit size Large
Significant No
Discovery year 1951
Discoverer Capital Mining Areas, A Subsidiary Of Union Corporation Limited
Discovery method Ore-Mineral In Place
Year of first production 1958

Mining district

District name Evander Area Of The Witwatersrand Goldfields

Land status

Ownership category Private

Ownership information

  • Type Joint Venture Owner
    Owner Ownership Distribution:
  • Type Joint Venture Partner
    Owner Union Corp. Ltd. (Management Control;
  • Type Joint Venture Partner
    Owner Anglo American Corp. Of South Africa, Ltd.
  • Type Joint Venture Partner
    Owner Corner House Investment Co., Ltd.
  • Type Joint Venture Partner
    Owner V. C. Investments Ltd.
  • Type Operator
    Owner Winkelhaak Mines Ltd.

Production statistics

  • Year 1976
    Material ORE AU
    Accuracy Accurate
    Description Ap_Grade: ^0.249 Tr Oz. Au/Met. Ton Of Ore Milled
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Gold Gold 0g/mt
  • Year 1976
    Material AU
    Accuracy Accurate
    Description Ap_Grade: ^0.251 Toz Au/Met. Ton Ore Milled
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 0g/mt
  • Year 1977
    Material ORE
    Accuracy Accurate
    Description Ap_Grade: ^0.233 Toz Au Met/Tons Ore Milled
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Gold Gold 0g/mt
  • Year 1977
    Material AU
    Accuracy Accurate
    Description Ap_Grade: ^0.242 Toz Au/Met Ton Ore Milled
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 0g/mt
  • Year 1978
    Material ORE AU
    Accuracy Accurate
    Description Ap_Grade: ^0.201 Toz Au/Met Ton Ore Milled
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Gold Gold 0g/mt
  • Year 1978
    Material AU
    Accuracy Accurate
    Description Ap_Grade: ^0.203 Toz Au/Met Ton Ore Milled
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 0g/mt
  • Year 1979
    Material AU
    Accuracy Accurate
    Description Ap_Grade: ^0.292 Toz Au/Met Ton Ore Milled
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 0g/mt
  • Year 1979
    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
    Major Ore Gold Gold 0g/mt
  • Year 1980
    Material ORE AU
    Accuracy Accurate
    Description Ap_Grade: ^0.194 Toz Au/Met Ton Ore Milled
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Gold Gold 0g/mt
  • Year 1980
    Material AU
    Accuracy Accurate
    Description Ap_Grade: ^0.282 Toz Au/Met Ton Ore Milled
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 0g/mt
  • Year 1981
    Material ORE AU
    Accuracy Accurate
    Description Ap_Grade: ^0.187 Toz Au/Met Ton Ore Milled
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Gold Gold 0g/mt
  • Year 1986
    Period 1986
    Material ORE
    Description Cp_Grade: ^0.280 To2 Au/Met Ton Ore
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Gold Gold 0g/mt
  • Year 1986
    Period 1986
    Material ORE AU
    Description Cp_Grade: ^0.280 Toz Au/Met Ton Ore
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Gold Gold 0g/mt

Comments on the production information

  • WORKS KIMBERLY REEF GROUP. AU/PT RECOVERY = 370:1.

Reserves and resources

  • Type In-situ
    Estimate year 1986
    Total resources 109,000,000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 8.708 g/mt Gold Major 1986

Comments on the reserve resource information

  • 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

Workings at the site

  • Type of workings Underground
    Overall depth 1600M

Comments on the workings information

  • MINING METHOD: CROSSCUTS FROM THE SHAFT TO ORE HORIZON (REEF) AT 100 - 150 - METER INTERVALS; DRIVES ALONG THE STRIKE AND WINZES DOWN-DIP COMPLETE DEVELOPMENT; STOPING & BACKFILLING ("SCATTER MINING") WITH CRIB TIMBER SUPPORT AND PILLARS COMPRISE FINAL MINING PHASE. FAULTING MODERATE. GOLD QUALITIES ERRATIC. N. W. - S. E. TREND OF MINERALIZATION IN THIS GOLDFIELD IS MAIN OPERATING AXIS OF THIS MINE.

Comments on development

  • YEAR OF DISCOVERY DATE IS APPROXIMATE ONLY. ; EXPAN$: 0.35 ( 1976 ) ; MILL.CAP: 2.0 MIL. MET. T/YR. ; ECON.COM: A LOW GRADE GOLD PRODUCER, BUT CURRENTLY MAINTAINING GOOD MINING COSTS ($53.35/TR OZ. OF GOLD RECOVERED DURING 1976 ) AND PROFITS. EST. MINE LIFE: 25 YEARS.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS W026846

Bibliographic references

  • Deposit

    UNION CORPORATION LIMITED, ANNUAL REPORT; 1975

  • Deposit

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

  • Deposit

    MINING JOURNAL QUARTERLY REVIEW OF SOUTH AFRICAN GOLD SHARES, VOL. 19 , NO. 1 ; MAY 1975

  • Deposit

    MERTIE, 1969, ECONOMIC GEOLOGY OF PLATINUM METALS: U.S. GEOLOGICAL SURVEY PROFESSIONAL PAPER 630, P. 45-48.

  • Deposit

    COUSINS, 1973, PLATINOIDS IN THE WITWATERSRAND SYSTEM: JOURNAL OF SOUTH AFRICA INSITUTE OF MINING AND METALLURGY, V. 73, NO. 6, P. 3-5.

  • Deposit

    WAGNER, 1929, PLATINUM DEPOSITS AND MINES OF SOUTH AFRICA: STRUIK (PTY) LTD., CAPETOWN 1973, P. 32-40.

  • Deposit

    MINING JOURNAL, 1977, V. 288.

  • Deposit

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

  • Deposit

    MINING JOURNAL, 1975, QUARTERLY REVIEW OF SOUTH AFRICAN SHARES: MINING JOURNAL, V. 19, NO. 1, MAY 1975.

  • Production

    CHAMBER OF MINES OF SOUTH AFRICA ; CHAMBER OF MINES ANALYSIS OF WORKING RESULTS-1982 ; CHAMBER OF MINES ANALYSIS OF WORKING RESULTS - 1983 ; CHAMBER OF MINES ANALYSIS OF WORKING RESULTS - 1984 ; WINKELHAAK ANNUAL REPORT - 1985 ; CHAMBER OF MINES ANALYSIS OF WORKING RESULTS-1986 ; ANALYSIS OF WORKING RESULTS, CHAMBER OF MINES OF SOUTH AFRICA. JANUARY - DECEMBER 1979 ; CHAMBER OF MINES OF SOUTH AFRICA, ANALYSIS OF WORKING RESULTS. JANUARY - DECEMBER, 1980 ; CHAMBER OF MINES OF SOUTH AFRICA - ANALYSIS OF WORKING RESULTS - 1981 ; ANALYSIS OF WORKING RESULTS, CHAMBER OF MINES OF SOUTH AFRICA. JANUARY-DECEMBER 1978 ; ANALYSIS OF WORKING RESULTS, CHAMBER OF MINES OF SOUTH AFRICA, JANUARY-DECEMBER, 1977

General comments

Subject category Comment text
Deposit MAX. THICKNESS REFERS TO APPROXIMATE STOPPING WIDTH OF THE KIMBERLEY REEF; THE ONLY ORE HORIZON RECOVERED AT THIS MINE. DEPTH TO BOTTOM IS ESTIMATED.
Deposit THIS RECORD INCLUDES DATA FROM DUPLICATE RECORD M046350 WHICH HAS BEEN DELETED FROM MRDS.
Deposit INFORMATION MERGED FROM RECORD NUMBER W028244 ; W028708 ; W028735 ; W030995 ; W032351 ; W032961 ; W033161 ; W033798 ; W044640 ; W055299

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAY-1977 Sweetwood, Charles W. Department of State
Updater 01-JUL-1987 Mccarter, Lorna D Department of State
Updater 01-OCT-1978 Sweetwood, Charles W. Department of State
Updater 01-APR-1980 Sweetwood, Charles W. Department of State
Updater 01-JAN-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-APR-1986 Mccarter, Lorna D Department of State
Updater 01-JUN-1987 Mccarter, Lorna D. Department of State