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Bracken

Producer in South Africa with commodities Gold, PGE, Silver
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Geologic information

Identification information

Deposit ID 10134651
MRDS ID ISM0327
MAS/MILS ID 7910200071
Record type Site
Current site name Bracken
Related records 10232163, 10256262, 60000647

Geographic coordinates

Point of reference Plant
Geographic coordinates: 29.10144, -26.51658 (WGS84)
(click for info)

Geographic areas

Country
South Africa

Commodities

Commodity Importance
Gold Primary
PGE Tertiary
Silver Secondary

Nearby scientific data

Plant (1) 29.10144, -26.51658
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Economic information

Economic information about the deposit and operations

Operation type Underground
Development status Producer
Commodity type Metallic
Significant Yes
Milling method Hydrometallurgy Unspecified

Ownership information

  • Type Owner-Operator
    Owner Bracken Mines Ltd
    Interest 100
  • Type Owner
    Owner Gencor

Reserves and resources

  • Type In-situ
    Estimate year 1982
    Demonstrated 8,000,000mt ore
    Indicated 8,000,000mt ore
    Total resources 8,000,000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 5.2 g/mt Gold Major 1982
    Silver Ag 0.5 g/mt Silver Minor 1982
    PGE Pt 0.1 g/mt PGE Trace 1982
  • Type In-situ
    Estimate year 1993
    Demonstrated 200,000mt ore
    Total resources 200,000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 10.4 g/mt Gold Major 1993

Comments on the reserve resource information

  • WAS UPDATED FOR 1992 AU AVAILABILITY STUDY. 1989 PRODUCTION = 69,317 OZ.AU FROM MILLING 633,086 MT ORE. 1991 PROD. = 59,019 OZ. AU FROM TREATING 343,000 TNS ORE.
  • RESOURCES FROM KIMBERLY REEF COVERS 2747 HA, ONLY 27.3% OF THE AREA AVAILABLE WILL BE MINE BECAUSE THE AREA IS HEAVILY FAULTED. PLATINUM METAL GROUP COMPRISE OF 34.5% OSMIUM, 32.5% IRIDIUM, 13.5% RUTHENIUM, 10.5% PLATINUM AND 1.0% RHODIUM.

Workings at the site

  • Type of workings Underground
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method ACTUAL
    Mining Method BREAST STOPING 10-30
    Capacity 2600
    Capacity Units MT ORE/DAY
    Unit Production Cost 26.79
    Operating Days per Year 350
    Operating Shifts per Day 3
    Year of Information 1981

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
U.S. Bureau of Mines Minerals Availability System MAS 7910200071
USGS Mineral Resources Data System MRDS ISM0327 MAS references MRDS

Bibliographic references

  • Reserve-Resource

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

  • 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, PP 50-53.

  • Deposit

    WORLD MINING REGISTER 76-77, MILLER FREEMAN PUBLICATIONS,

  • Deposit

    INC., 1977.

  • Deposit

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

  • Deposit

    TRATIONS RELATED TO SEDIMENT GEOLOGY IN THE PRECAMBRIAN

  • Deposit

    VAAL REEF PLACER, WITWATERSRAND, SOUTH AFRICA, ECONOMIC

  • Deposit

    GEOLOGY, V. 71, NO. 1, 1977, PP 157-176.

  • Deposit

    ENGINEERING AND MINING JOURNAL INTERNATIONAL DIRECTORY OF

  • Deposit

    MINING AND MINERAL PROCESSING OPERATIONS, MCGRAW HILL,

  • Deposit

    NEW YORK, 1976.

  • Deposit

    SOUTH AFRICA, GEOLOGICAL SURVEY SPECIAL PUBLICATION NO. 18,

  • Deposit

    1972.

  • Deposit

    MINING ANNUAL REVIEW, MINING JOURNAL, LONDON, 1977, PP 431-

  • Deposit

    443.

  • Deposit

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

  • Deposit

    SURVEY PUBLICATION, HANDBOOK 7, FIFTH EDITION, 1976,

  • Deposit

    PP 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 HOFFENBER, S.N, WITWATERSRAND MINING

  • Deposit

    PRACTICE, THE TRANSVAAL CHAMBER OF MINES, GOLD PRODUCERS

  • Deposit

    COMMITTEE, 1932.

  • Deposit

    BRACKEN MINES LTD, ANNUAL REPORTS, 1975, 1976.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-AUG-1994 Boyle, Ed U.S. Bureau of Mines