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Tweefontein

Plant in South Africa with commodity Chromium
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Geologic information

Identification information

Deposit ID 10134647
MRDS ID DE00042
MAS/MILS ID 7910200195
Record type Site
Current site name Tweefontein
Related records 10106675

Geographic coordinates

Point of reference Ore Body
Geographic coordinates: 30.12641, -24.89244 (WGS84)
Elevation 1000
Location accuracy 10000(meters)
(click for info)

Geographic areas

Country
South Africa

Commodities

Commodity Importance
Chromium Primary

Nearby scientific data

Ore Body (1) 30.12641, -24.89244
ListMap

Ore body information

  • Strike N03E
    Dip 12W
    Thickness 1.8M
    Depth to top 150M
    Width 577M
    Length 500M
    Field Value
    MAS Matrix # 1
    MAS Column # 2
    Type of Orebody #1 STRATIFORM
    Shape of Orebody #1 TABULAR
    Primary mode of Origin MAGMATIC DIFFER
    Primary Ore Control IGNEOUS
    Secondary Ore Control LITHOLOGY
    Type of Wallrock Alter. #1 SILICIFICATION
    Strike And Dip N03E
    Minimum Depth to Top 0
    Date of Last Modification 930518

Economic information

Economic information about the deposit and operations

Operation type Underground
Development status Plant
Commodity type Metallic
Significant Yes
Discovery year 1934
Mining method Open Stope - Breast Stoping
Year of first production 1977
Plant type Beneficiation (Mill)
Plant subcategory Gravity
Milling method Gravity

Mining district

District name East Bushveld Complex

Mineral rights holdings

Type of mineral rights Federal Lease
Type of mineral rights State Lease

Ownership information

  • Type Owner
    Owner Samancor / Gencor
    Interest 100
    Home office South Africa
    Year 1989
  • Type Operator
    Owner Chromore Pty. Ltd.
    Home office South Africa
    Year 1989

Comments on the production information

  • RECOVERIES IN THE Y-RECORD ARE INDIVIDUAL RECOVERIES PER EACH PRODUCT. THE TOTAL RECOVERY IS 89.49%.

Comments on the reserve resource information

  • IN Q-MATRIX 1, COL 1 REPRESENTS THE IN-SITU TONNAGE, WHILE COL 2 REPRESENTS THE RECOVERABLE RESOURCE TONNAGE.
  • 1/89 INSITU DEMO.TONNAGE= FOR 120 M VERTICAL ABOVE THE PLANE OF MAIN HILL TO 300 M VERTICAL BELOW PLANE OF HILL. 70 % RECOV.

Workings at the site

  • Type of workings Underground
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method ESTIMATE
    Mining Method BREAST STOPING 10-30
    Percent Recovery 70
    Hardness of Rock HARDROCK WITH LITTLE WATER
    Rock Characteristics ONE SYSTEM OF WEAKNESS PLANES
    Rock Support Chars. SUPPORTING
    Mine Support Chars. POST, HEADBOARD, CAPS, ROOF BOLTS
    Length of Inclines (m) 1500
    Slope of Inclines 12
    Number of Inclines 2
    1st Condition of Workings OPEN
    Capacity 2720
    Capacity Units MT ORE/DAY
    Unit Production Cost 11.12
    Units of Production $/MT ORE
    Operating Days per Year 250
    Operating Shifts per Day 2
    Year of Information 1989

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
U.S. Bureau of Mines Minerals Availability System MAS 7910200195
USGS Mineral Resources Data System MRDS DE00042 MAS references MRDS

Bibliographic references

  • Deposit

    PAPP J, 1985, "TRIP REPORT TO THE REPUBLIC OF SOUTH AFRICA-

  • Deposit

    TWEEFONTEIN", USBM, OCT., 1985.

  • Deposit

    SAITO H, 1984, "A VISIT TO SAMANCOR OF SOUTH AFRICA", THE

  • Deposit

    TEX REPORT, THURS. DEC. 20, 1984, V. 16, NO. 3861.

  • Deposit

    ANON., 1984, "GENCOR TO REINFORCE CHROME MINE FACILITIES",

  • Deposit

    THE TEX REPORT, WED. AUG. 22, 1984, V. 16, NO. 3778.

  • Deposit

    SILK M H, 1988, "WORLD CHROMITE RESOURCES AND FERROCHROME

  • Deposit

    PRODUCTION", MINTEK SPECIAL PUBL. NO. 11.

  • Deposit

    DAVIDOFF R L, BOYLE E H JR., 1988, "NOTES FROM VISIT TO THE

  • Deposit

    REPUBLIC OF SOUTH AFRICA", USBM .

Reporter information

Type Date Name Affiliation Comment
Reporter 19-MAY-1993 Boyle, Ed U.S. Bureau of Mines