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President Steyn Mine

Producer in Free State, South Africa with commodities Gold, Uranium, PGE, Platinum, Osmium, Iridium, Rhodium, Ruthenium, 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. Mineral occurrence model information
  9. Host and associated rocks
  10. Nearby scientific data
  11. Geologic structures
  12. Ore body information
  13. Controls for ore emplacement
  14. Economic information about the deposit and operations
  15. Mining district
  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 10089216
MRDS ID W014840
Record type Site
Current site name President Steyn Mine
Related records 10255807

Geographic coordinates

Geographic coordinates: 26.80149, -27.99654 (WGS84)
Elevation 1341
Relative position SOUTHEAST OF, AND ADJOINING, WELKOM CITY LIMITS

Site location context

Political divisions (FIPS codes)

Free State(province)

South Africa(country)

Africa(continent)

Land(continent)

Geographic areas

Country State
South Africa Free State

Commodities

Commodity Importance
Gold Primary
Uranium Secondary
PGE Critical Secondary
Platinum Critical Secondary
Osmium Secondary
Iridium Critical Secondary
Rhodium Critical Secondary
Ruthenium Critical Secondary
Silver Secondary

Comments on the commodity information

  • A URANIUM PRODUCER AS A MINOR COMMODITY FROM 1955 THROUGH 1966. URANIUM RECOVERIES WILL BE REACTIVATED IN 1978, FROM CURRENT AND ACCUMULATED SLIMES. 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
Gold Ore
Iridium Ore
Sperrylite Ore

Alteration

  • (Local) None

Analytical data

Result COMPOSITION OF PLATINOIDS: IR = 31.6%, OS = 39.1%, RU = 15.0%, PT = 12.9%, RH = 1.4%

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 Upper Elsburg Conglomerates And Quartzites;Karroo System Conglomerates And Shales
    Rock description Upper Elsburg Conglomerates And Quartzites;Karroo System Conglomerates And Shales
  • 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) 26.80149, -27.99654
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Unique Continuity Of Gold - Bearing Horizons Over Extended Area, Though Well Marked By Faulting, Folding And (Locally) Erosion And Redeposition Of Overlying Sediments.
Type of structure Local
Structure description Gentle Dip Regionally, With Folds And Faults Locally. Overlying Lavas, Quartzites And Conglomerates Are Massive.

Ore body information

  • General form TABULAR/BLANKET
    Strike N - S
    Dip 20 DEG. E
    Thickness 0.16M
    Depth to bottom 1890M

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 Metallic
Deposit size Large
Significant No
Year of first production 1954

Mining district

District name Orange Free State Area Of The Witwatersrand Goldfields

Ownership information

  • Type Joint Venture Owner
    Owner Ownership Distribution:
  • Type Joint Venture Partner
    Owner Anglo American Corp. Of South Africa, Ltd.
    Interest 21.46
  • Type Joint Venture Partner
    Owner Orange Free State Inves. Trust Ltd.
    Interest 21.43
  • Type Joint Venture Partner
    Owner African And European Inves. Co. Ltd. (Major Investment, % Not Known. Mgt Control)
  • Type Joint Venture Partner
    Owner The Vereeniging Estates Ltd. (Minor Investment, % Not Known)
  • Type Joint Venture Partner
    Owner Sentrust Beperk (Minor Investment, % Not Known)
  • Type Operator
    Owner President Steyn Gold Mining Co. Ltd.

Production statistics

  • Year 1984
    Period 1984
    Material ORE AU
    Description Cp_Grade: ^0.134 Toz Au/Met Ton And 0.100 Kg U3o8/Met Ton Ore.
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    U3O8 Ore Uranium Uranium 100g/mt
    Ore Gold Gold 4g/mt
  • Year 1985
    Period 1985
    Material ORE AU
    Description Cp_Grade: ^0.326 Toz Au/Met Ton And 0.10 Kg U308/
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    U3O8 Ore Uranium Uranium 100g/mt
    Ore Gold Gold 9g/mt

Comments on the production information

  • WORKS THE BIRD REEF GROUP. AU/PT RECOVERY = 2890:1. ; SEE COMMODITY COMMENTS ABOVE

Reserves and resources

  • Type In-situ
    Estimate year 1984
    Total resources 14000000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 4.167 g/mt Gold Major 1984
    Uranium U3O8 0.0001 wt-pct Uranium Minor 1984

Comments on the reserve resource information

  • CHAMBER OF MINES ANALYSES OF WORKING RESULTS - 1984 ; 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 1890M

Comments on the workings information

  • MINING METHOD: CROSSCUTS FROM THE SHAFT TO ORE HORIZON (REEF) AT 150 - METER INTERVALS; DRIVES ALONG THE STRIKE AND WINZES DOWN - DIP COMPLETE DEVELOPMENT; STOPING AND BACKFILLING ("SCATTER MINING") WITH CRIB TIMBER SUPPORT AND PILLARS COMPRISE FINAL MINING PHASE.

Comments on development

  • EXPAN$: 6.9 (1976) ; MILL.CAP: 3.2 MIL. MET. T/YR. 1976 ; ECON.COM: A MEDIUM GRADE GOLD AND POTENTIAL URANIUM PRODUCER WITH CURRENT COSTS AT $70.05/TROY OUNCE OF GOLD RECOVERED (1976). CURRENT RECOVERIES ARE FROM ONE ORE HORIZON (REEF) ONLY (THE BASAL REEF). FUTURE AU & URECOVERIES ARE PLANNED FROM THE OVERLYING LEADER REEF AS WELL (POSSIBLY 1978). CURRENT ESTIMATED MINE LIFE: 15 YEARS.

Reference information

Bibliographic references

  • Deposit

    ANGLO AMERICAN CORPORATION OF SOUTH AFRICA LIMITED; ANNUAL REPORTS: 1974 & 1975

  • Deposit

    PRESIDENT STEYN GOLD MINING COMPANY LIMITED, ANNUAL REPORT: 1975

  • Deposit

    "THE ORANGE FREE STATE GOLDFIELD" (ANGLO AMERICAN CORPORATION OF SOUTH AFRICA LIMITED); 1960

  • Deposit

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

  • 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 INSTITUTE OF MINING AND METALLURGY, V. 73, NO. 6, P. 3-5.

  • Deposit

    FEATHER, 1976, MINERALOGY OF THE PLATINUM-GROUP MINERALS IN THE WITWATERSRAND: ECONOMIC GEOLOGY, V. 71, NO. 7.

  • Deposit

    WAGNER, 1929, PLATINUM DEPOSITS AND MINES OF SOUTH AFRICA: STRUIK (PTY) LTD., CAPETOWN 1973, P. 932-40.

  • 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

    ANALYSES OF WORKING RESULTS, CHAMBER OF MINES OF SOUTH AFRICA (CURRENT YEAR) ; CHAMBER OF MINES ANALYSIS OF WORKING RESULTS - 1982 ; CHAMBER OF MINES ANALYSIS OF WORKING RESULTS - 1983 ; CHAMBER OF MINES ANALYSIS OF WORKING RESULTS - 1984 ; CHAMBER OF MINES ANALYSIS OF WORKING RESULTS - 1985 ; ANALYSIS OF WORKING RESULTS, CHAMBER OF MINES OF SOUTH AFRICA. JANUARY DECEMBER 1979 ; ANALYSES OF WORKING RESULTS, CHAMBER OF MINES OF SOUTH AFRICA - 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 THIS RECORD INCLUDES DATA FROM DUPLICATE RECORD M046300 WHICH HAS BEEN DELETED FROM MRDS.
Deposit MAX THICKNESS REFERS TO BASAL REEF ORE HORIZON ONLY
Deposit INFORMATION MERGED FROM RECORD NUMBER W028248 ; W028678 ; W028716 ; W030935 ; W032340 ; W032947 ; W033101 ; W033785 ; W044611

Reporter information

Type Date Name Affiliation Comment
Reporter 01-FEB-1977 Sweetwood, Charles W. Department of State
Updater 01-JUN-1985 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-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-APR-1986 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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