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Kloof/Leeudoorn

Plant in South Africa with commodities Gold, Silver
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Geologic information

Identification information

Deposit ID 10207607
MRDS ID M046860
MAS/MILS ID 7910200051
Record type Site
Current site name Kloof/Leeudoorn
Alternate or previous names Kloof
Related records 10106905

Geographic coordinates

Geographic coordinates: 27.63476, -26.3799 (WGS84)
Elevation 1700
(click for info)

Geographic areas

Country
South Africa

Commodities

Commodity Importance
Gold Primary
Silver Secondary

Materials information

Materials Type of material
Pyrite Unknown
Quartz Unknown

Nearby scientific data

(1) 27.63476, -26.3799
ListMap

Ore body information

  • Field Value
    MAS Matrix # 3
    MAS Column # 1
    Type of Orebody #1 PLACER
    Shape of Orebody #1 LENTICULAR
    Primary mode of Origin SEDIMENTATION
    Primary Ore Control FOLDING
    Secondary Ore Control FAULTING
    Degree of Wallrock Alter. MODERATE
    Type of Wallrock Alter. #1 SERICITIC
    Date of Last Modification 850909

Comments on the geologic information

  • THE MODIFIED PLACER THEORY, IN WHICH GOLD WAS DEPOSITED AS PLACER GRAINS THEN LATER MOBILIZED AND RECRYSTALLIZED DURING METAMORPHISM, IS THE MOST WIDELY ACCEPTED THEORY OF DEPOSIT FORMATION.
  • THE UPPER DIVISION OF THE WITWATERSRAND SUPERGROUP CONTAINS THE MOST PRODUCTIVE AURIFEROUS AND URANIFEROUS UNITS OF THE RAND; LESSER MINERALIZATION IS CONTAINED IN THE OVERLYING VENTERSDORP AND TRANSVAAL SUPERGROUPS.

Economic information

Economic information about the deposit and operations

Operation type Underground
Development status Plant
Commodity type Metallic
Significant Yes
Mining method Filled Stopes
Year of first production 1968
Plant type Leach
Plant subcategory Hydromet
Milling method Carbon-In-Pulp-Electrowin

Mineral rights holdings

Type of mineral rights State Lease

Ownership information

  • Type Owner-Operator
    Owner Kloof Gold Mining Co., Ltd.
    Interest 100
    Home office South Africa
    Year 1982

Comments on the ownership information

  • KLOOF GOLD MINING CO. LTD., IS A SUBSIDIARY OF THE GOLD FIELDS GROUP.

Production statistics

  • Year 1968
    Description Feed Grade 14.98 G/Mt Au, 1.5 G/Mt Ag 729000 Mtpy
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Trace Silver Silver 2g/mt
    Major Gold Gold 15g/mt
  • Year 1969
    Description Feed Grade 14.98 G/Mt Au, 1.5 G/Mt Ag 1321000 Mtpy
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Trace Silver Silver 2g/mt
    Major Gold Gold 15g/mt
  • Year 1970
    Description Feed Grade 14.98 G/Mt Au, 1.5 G/Mt Ag 1941000 Mtpy
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Trace Silver Silver 2g/mt
    Major Gold Gold 15g/mt
  • Year 1971
    Description Feed Grade 14.98 G/Mt Au, 1.5 G/Mt Ag 1782000 Mtpy
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Trace Silver Silver 2g/mt
    Major Gold Gold 15g/mt
  • Year 1972
    Description Feed Grade 14.98 G/Mt Au, 1.5 G/Mt Ag 1759000 Mtpy
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Trace Silver Silver 2g/mt
    Major Gold Gold 15g/mt
  • Year 1973
    Description Feed Grade 14.98 G/Mt Au, 1.5 G/Mt Ag 1630000 Mtpy
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Trace Silver Silver 2g/mt
    Major Gold Gold 15g/mt
  • Year 1974
    Description Feed Grade 14.98 G/Mt Au, 1.5 G/Mt Ag 1455000 Mtpy
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Trace Silver Silver 2g/mt
    Major Gold Gold 15g/mt
  • Year 1975
    Description Feed Grade 14.98 G/Mt Au, 1.5 G/Mt Ag 1327000 Mtpy
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Trace Silver Silver 2g/mt
    Major Gold Gold 15g/mt
  • Year 1976
    Description Feed Grade 14.98 G/Mt Au, 1.5 G/Mt Ag 1412000 Mtpy
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Trace Silver Silver 2g/mt
    Major Gold Gold 15g/mt
  • Year 1977
    Description Feed Grade 14.98 G/Mt Au, 1.5 G/Mt Ag 1632000 Mtpy
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Trace Silver Silver 2g/mt
    Major Gold Gold 15g/mt
  • Year 1978
    Description Feed Grade 14.98 G/Mt Au, 1.5 G/Mt Ag 1889000 Mtpy
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Trace Silver Silver 2g/mt
    Major Gold Gold 15g/mt
  • Year 1979
    Description Feed Grade 14.98 G/Mt Au, 1.5 G/Mt Ag 2090000 Mtpy
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Trace Silver Silver 2g/mt
    Major Gold Gold 15g/mt
  • Year 1980
    Description Feed Grade 14.98 G/Mt Au, 1.5 G/Mt Ag 2090000 Mtpy
  • Year 1981
    Description Feed Grade 14.98 G/Mt Au, 1.5 G/Mt Ag 2095000 Mtpy
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Trace Silver Silver 2g/mt
    Major Gold Gold 15g/mt
  • Year 1992
    Description Mine Production Of Gold Bullion 34 Metric Tons.
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 34mt

Reserves and resources

  • Type In-situ
    Estimate year 1993
    Demonstrated 4,240,000mt ore
    Total resources 4,240,000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 25.2 g/mt Gold Major 1993

Comments on the reserve resource information

  • 1989 AU PRODUCTION = 849,720 OZ FROM TREATING 2,160,000 MT ORE. WAS UPDATED FOR THE 1992 AU AVAILABILITY STUDY. 1991 AU PRODUCTION =1.026,714 OZ FROM TREATING 2,745,000 MT ORE
  • Q1 + Q2 = Q3. RESERVE ESTIMATE FROM SOUTH AFRICAN MINE VALUATION, CHAMBER OF MINES OF SOUTH AFRICA, STORRAR, C.D., 1981, 470 PP. Q 1 CONTAINS RESERVE DATA FOR THE VENTERSDORP CONTACT REEF AND Q2 CONTAINS RESERVE DATA FOR THE KLOOF REEF.

Workings at the site

  • Type of workings Underground
    Overall depth 1485M
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method ACTUAL
    Mining Method FILLED STOPES
    Percent Recovery 100
    Hardness of Rock UNKNOWN
    Rock Characteristics UNKNOWN
    Rock Support Chars. UNKNOWN
    Mine Support Chars. TIMBER
    Number of Shafts 4
    1st Condition of Workings UNKNOWN
    Capacity 6000
    Capacity Units MT ORE/DAY
    Unit Production Cost 48.68
    Units of Production $/MT ORE
    Operating Days per Year 350
    Operating Shifts per Day 2
    Year of Information 1982
  • Type of workings Underground
    Overall depth 1485M
    Field Value
    MAS Development Schedule # 1
    Mining Record # 2
    Status of Mining Method ACTUAL
    Mining Method BREAST STOPING 10-30
    Percent Recovery 100
    Hardness of Rock UNKNOWN
    Rock Characteristics UNKNOWN
    Rock Support Chars. UNKNOWN
    Mine Support Chars. TIMBER
    Number of Shafts 4
    1st Condition of Workings UNKNOWN
    Capacity 6000
    Capacity Units MT ORE/DAY
    Unit Production Cost 54.55
    Units of Production $/MT ORE
    Operating Days per Year 350
    Operating Shifts per Day 2
    Year of Information 1982

Comments on other economic factors

  • ALL NEWLY MINED GOLD IN SOUTH AFRICA IS REFINED AT RAND REFINERY LTD., WHICH IS OWNED BY THE MINE MEMBERS OF THE CHAMBER OF MINES AND IS A NON-PROFIT ORGANIZATION. FEES CHARGED TO COVER THE COST OF OPERATION. THE BULLION IS REFINED INTO 12.5 KILOGRAM GOLD BARS OR BLANKS FOR KRUGERRANDS, BOTH OF 996 FINENESS, AND 35 KILOGRAM ELECTROLYTIC SILVER BARS OF 999+ FINENESS. A SMALL AMOUNT OF ELECTROLYTIC GOLD OF 999+ FINENESS IS ALSO PRO- DUCED FOR INDUSTRIAL PROPOSES.
  • THE DORE BULLION IS SHIPPED IN RAND REFINERY ARMORED TRUCKS, THE COST OF WHICH IS INCLUDED IN THE REFINING FEES. COIN BLANKS ARE SHIPPED F.O.B. TO THE SOUTH AFRICAN MINT. GOLD BARS ARE SENT C.I.F. TO THE SOUTH AFRICAN RESERVE BANK DAILY. SILVER IS SOLD TO THE SOUTH AFRICAN MINT OR ON THE LONDON MARKET BY TENDER.
  • KLOOF IS PRESENTLY SINKING THE NO. 3 SUB-VERTICAL SHAFT. AFTER COMPLETION OF THE NO. 3 SYSTEM DURING 1983, PLANS ARE TO BEGIN SINKING THE NO. 4 SHAFT SYSTEM IN THE EASTERN PORTION OF THE LEASE AREA.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
U.S. Bureau of Mines Minerals Availability System MAS 7910200051
USGS Mineral Resources Data System MRDS M046860 MAS references MRDS

Bibliographic references

  • Geology

    ANHAEUSSER, C.R., 1976, THE NATURE AND DISTRIBUTION OF

  • Geology

    ARCHEAN GOLD MINERALIZATION IN SOUTHERN AFRICA, MINERALS

  • Geology

    SCI. ENGNG., V.8, NO. 1, PP 46-84.

  • Geology

    BOYLE, R.W., 1979, THE GEOCHEMISTRY OF GOLD AND ITS DEPOSITS

  • Geology

    GEOLOGICAL SURVEY OF CANADA, BULLETIN 280, 584 PP.

  • Geology

    HAUGHTON, S.H. ED., 1964A, THE GEOLOGY OF SOME ORE DEPOSITS

  • Geology

    IN SOUTHERN AFRICA, V. I, GOLD DEPOSITS OF THE WITWATER-

  • Geology

    SRAND BASIN, GEOL. SOC. S. AFR., JOHANNESBURG, 625 PP.

  • Geology

    LIEBENBERG, W.R., 1972, MINERALOGICAL FEATURES OF GOLD ORES

  • Geology

    IN SOUTH AFRICA, IN GOLD METALLURGY IN SOUTH AFRICA,

  • Geology

    EDITED BY R.J. ADAMSON, CHAMBER OF MINES OF S.A.

  • Geology

    PRETORIUS, D.A., 1981, GOLD AND URANIUM IN QUARTZ-PEBBLE

  • Geology

    CONGLOMERATES, ECONOMIC GEOLOGY 75TH ANNIVERSARY VOLUME,

  • Geology

    PP 117-138.

  • Geology

    PRETORIUS, D.A., 1975, THE DEPOSITIONAL ENVIRONMENT OF THE

  • Geology

    WITWATERSTRAND GOLDFIELDS: A CHRONOLOGICAL REVIEW OF

  • Geology

    SPECULATIONS AND OBSERVATIONS, MINERAL SCI. ENGNG., V. 7,

  • Geology

    NO. 1, PP 18-47.

  • Geology

    SMITH, N.D., AND MINTER, W.E.L., 1980, SEDIMENTOLOGICAL

  • Geology

    CONTROLS OF GOLD AND URANIUM IN TWO WITWATERSTRAND PALEO-

  • Geology

    PLACERS, ECONOMIC GEOLOGY, V. 75, PP 1-14.

  • Production

    MINING WEEKLY, P. 6 (JUNE 25, 1993).

  • Reserve-Resource

    MINING JOURNAL SUPPLEMENT. NOV.3,1978.

  • Reserve-Resource

    MOHIDE, T.P., 1981, GOLD, MINERAL POLICY BACKGROUND PAPER

  • Reserve-Resource

    NUMBER 12, ONTARIO MINISTRY OF NATURAL RESOURCES, PP 84-

  • Reserve-Resource

    112.

  • Reserve-Resource

    STORRAR, C.D., 1981, SOUTH AFRICAN MINE VALUATION, CHAMBER

  • Reserve-Resource

    OF MINES OF SOUTH AFRICA, 470 PP.

  • Reserve-Resource

    AME MINERAL ECONOMICS QUARTERLY MINE ANALYSIS, JUN 93,P. 32.

  • Workings

    ADAMSON, R.J. ED., 1972, GOLD METALLURGY IN SOUTH AFRICA,

  • Workings

    CHAMBER OF MINES OF SOUTH AFRICA, 452 PP.

  • Workings

    FINANCIAL TIMES, 1981, MINING INTERNATIONAL YEARBOOK

  • Workings

    (SELECTED EXCERPTS).

  • Workings

    KING, A., 1949, GOLD METALLURGY ON THE WITWATERSTRAND,

  • Workings

    TRANSVAAL CHAMBER OF MINES, 458 PP.

  • Workings

    MCQUISTON, F.W., AND SHOEMAKER, R.S., 1975, GOLD AND SILVER

  • Workings

    CYANIDATION PLANT PRACTICE, SOCIETY OF MINING ENGINEERS.

  • Deposit

    TOOMBS, R.B., A SURVEY OF THE MINERAL INDUSTRY OF SOUTH

  • Deposit

    AFRICA, MINERAL INFORMATION BULLETIN MR 58, MINERAL

  • Deposit

    RESOURCES DIVISION, DEPARTMENT OF MINES, OTTAWA, 1962.

  • Deposit

    WORLD MINING, WITWATERSRAND GOLD, MAY 1977, P. 50-53.

  • Deposit

    WORLD MINING REGISTER 76-77, MILLER FREEMAN PUBLICATIONS,

  • Deposit

    INC., 1977.

  • Deposit

    MINTER, W.E.L., DETRITAL GOLD, URANIUM, AND PYRITE CON-

  • Deposit

    CENTRATIONS RELATED TO SEDIMENTOLOGY IN THE PRECAMBRIAN

  • Deposit

    VAAL REEF PLACER, WITWATERSRAND, SOUTH AFRICA, ECONOMIC

  • Deposit

    GEOLOGY, V. 71, NO. 1, 1976, PP 157-176.

  • Deposit

    ENGINEERING AND MINING JOURNAL INTERNATIONAL DIRECTORY OF

  • Deposit

    MINING AND MINERAL PROCESSING OPERATIONS, MC GRAW HILL,

  • Deposit

    NEW YORK, 1976.

  • Deposit

    SOUTH AFRICA, GEOLOGICAL SURVEY SPECIAL PUBLICATION NO. 18,

  • Deposit

    1972.

  • Deposit

    MINING ANNUAL REVIEW, MINING JOURNAL, LONDON, 1977, P. 431-

  • Deposit

    443.

  • Deposit

    COETZEE, C.B., MINERAL RESOURCES OF SOUTH AFRICA, GEOLOGICAL

  • Deposit

    SURVEY PUBLICATION, HANDBOOK 7, FIFTH EDITION, 1976,

  • Deposit

    P. 39-74, 233-240.

  • Deposit

    MINING JOURNAL, QUARTER ENDING, JUNE 1977.

  • Deposit

    THE MINERAL RESOURCES OF THE UNION OF SOUTH AFRICA, GEOLOGI-

  • Deposit

    CAL SURVEY PUBLICATION, 1959, FOURTH EDITION.

  • Deposit

    WATERMEYER, G.A. AND HOFFENBERG, S.N., WITWATERSRAND MINING

  • Deposit

    PRACTICE, THE TRANSVAAL CHAMBER OF MINES, GOLD PRODUCERS

  • Deposit

    COMMITTEE, 1932.

  • Deposit

    KLOOF GOLD MINING CO., LTD. ANNUAL REPORTS, 1975, 1976.

  • Deposit

    CHAMBER OF MINES OF SOUTH AFRICA, 1981, RAND REFINERY,

  • Deposit

    P.R.D. SERIES NO. 255, 20 PP.

  • Deposit

    CHAMBER OF MINES OF SOUTH AFRICA, 1980?, GOLD IN SOUTH

  • Deposit

    AFRICA, P.R.D. SERIES NO. 241, 28 PP.

  • Deposit

    CHAMBER OF MINES, 1980, OVERVIEW OF THE SOUTH AFRICAN MINING

  • Deposit

    INDUSTRY.

  • Deposit

    ELEVATORSKI, E.A., 1981, GOLD MINES OF THE WORLD, PUBLISHED

  • Deposit

    BY MINOBRAS, PP 78-86.

  • Deposit

    POTTS, D., 1981, THE SOUTH AFRICAN GOLD MINING INDUSTRY IN

  • Deposit

    GOLD, 1981, PUBLISHED BY CONSOLIDATED GOLD FIELDS LTD.,

  • Deposit

    PP 71-85.

  • Deposit

    GOLD INSTITUTE, 1981, GOLD REGULATIONS AND TAXES FOR MINING,

  • Deposit

    REFINING, MANUFACTURING AND TRADE IN THIRTEEN COUNTRIES,

  • Deposit

    PP 74-79.

  • Deposit

    CHAMBER OF MINES OF SOUTH AFRICA, 1982, ANALYSIS OF WORKING

  • Deposit

    RESULTS, OCTOBER-DECEMBER, 1981, 8 PP.

  • Deposit

    CHAMBER OF MINES OF SOUTH AFRICA, 1981, 91ST ANNUAL REPORT

  • Deposit

    AND STATISTICAL TABLE, 116 PP.

  • Deposit

    MINING JOURNAL RESEARCH SERVICES, 1982, PRODUCTION AND

  • Deposit

    CAPITAL EXPENDITURE FOR THE SOUTH AFRICAN GOLD MINES,

  • Deposit

    1966-1981.

  • Deposit

    MINING JOURNAL RESEARCH SERVICES, 1982, SUMMARY REPORT ON

  • Deposit

    PRODUCTION AND RECOVERY FOR THE SOUTH AFRICAN GOLD MINES,

  • Deposit

    ANNUAL REPORTS - KLOOF GOLD MINING COMPANYS LTD., 1981.

  • Deposit

    CAPITAL EXPENDITURE ANALYSES - KLOOF (EXCERPTS FROM 1966-

  • Deposit

    1981 ANNUAL REPORTS WITH CALCULATIONS).

  • Deposit

    MINING JOURNAL, 1980-1982, QUARTERLY REVIEWS OF SOUTH

  • Deposit

    AFRICAN GOLD SHARES - KLOOF.

General comments

Subject category Comment text
Deposit THE DATA CONTAINED IN THIS FILE WAS COLLECTED BY DAVY MCKEE UNDER U.S. BUREAU OF MINES CONTRACT #JO215039 IN 1982.

Reporter information

Type Date Name Affiliation Comment
Reporter 26-AUG-1994 Boyle, Ed U.S. Bureau of Mines