1. Mineral Resources
  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

Zwartkop Magazine Seam

Plant in South Africa with commodity Chromium
Map
XML
JSON
KML
B
Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Nearby scientific data
  8. Ore body information
  9. Economic information about the deposit and operations
  10. Mining district
  11. Ownership information
  12. Workings at the site
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10231513
MRDS ID W028281
MAS/MILS ID 7910200036
Record type Site
Current site name Zwartkop Magazine Seam
Alternate or previous names Zwartkop
Related records 10079230, 10280286, 10304623, 10231583

Geographic coordinates

Point of reference Ore Body
Geographic coordinates: 27.30144, -24.78837 (WGS84)
Elevation 1070
Location accuracy 10000(meters)

Site location context

Political divisions (FIPS codes)

South Africa(country)

Africa(continent)

Land(continent)

Geographic areas

Country
South Africa

Commodities

Commodity Importance
Chromium Critical Primary

Materials information

Materials Type of material
Chromite Unknown
Pyroxene Unknown

Nearby scientific data

Ore Body (1) 27.30144, -24.78837
ListMap

Economic information

Ore body information

  • Strike N45E
    Dip 23E
    Thickness 0.86M
    Length 1500M
    Width 460M
    Depth to top 75M
    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
    Strike And Dip N45E:23E
    Minimum Depth to Top 0
    Date of Last Modification 930512
  • Strike N75E
    Dip 22S
    Thickness 0.4M
    Length 13000M
    Width 800M
    Depth to top 150M
    Field Value
    MAS Matrix # 1
    MAS Column # 3
    Type of Orebody #1 OTHER
    Shape of Orebody #1 TABULAR
    Primary mode of Origin MAGMATIC DIFFER
    Primary Ore Control IGNEOUS
    Secondary Ore Control LITHOLOGY
    Degree of Wallrock Alter. SLIGHT
    Type of Wallrock Alter. #1 OTHER
    Strike And Dip N75E:22S
    Minimum Depth to Top 0
    Avg. Thick. Unconsol. Mat. .5
    Min. Thick. Unconsol. Mat. 0
    Date of Last Modification 830712

Comments on the geologic information

  • TYPE OF ORE BODY IS LAYERED INSTRUSIVE. FIVE SEAMS HAVE BEEN EXPLOITED AT THE ZWARTKOP MINE. THESE NCLUDE FROM BOTTOM UP: COMPOUND (254-305MM), OLD (254MM), INTERMEDIATE (279MM), NEW (229-305MM), AND MAGAZINE (914-1016MM).
  • A LARGE DIABASE DIKE TRENDING NNW-SSE CUTS THROUGH AND DISPLACES ALL SEAMS.

Economic information about the deposit and operations

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

Mining district

District name West Bushveld Complex

Ownership information

  • Type Owner
    Owner General Mining Group
    Interest 100
    Home office South Africa
    Year 1989
  • Type Operator
    Owner Chrome Mines Of South Africa
    Home office South Africa
    Year 1989

Comments on the production information

  • BECAUSE OF THE HIGH CR/FE RATIO, THE LUMP AND CHIP PRODUCTS ARE ASSIGNED AS MET. GRADE. THE CONC. COULD BE MARKETED AS: MET, CHEM, REFRACT. GRADES OR FOUNDRY SAND.
  • ACCORDING TO CERTAIN SOURCES, THE ZWEARTKOP OPERATIONS WERE CLOSED EARLY IN 1980 AND WERE ON A CARE AND MAINTENANCE BASIS PENDING IMPORVEMENT IN THE CHROMITE MARKET.
  • THE RECOVERIES IN THE Y-RECORD ARE FOR INDIVIDUAL PRODUCTS. THE TOTAL RECOVERY IS 89.51%.

Comments on the reserve resource information

  • Q-MATRIX 1 IS FOR ORE DOWN TO 150 M VERT. COL 1 IS THE IN-SITU RESOURCE, WHILE COL 2 IS THE RECOVERABLE RESOURCE. Q-MATRIX 2 REPRESENTS ALL ORES DOWN TO 300 M VERT DEPTH. ONCE AGAIN COL 1 IS FOR IN-SITU AND COL 2 IS RECOVERABLE.
  • 1/89 INSITU DEMO. TONNAGE = TO 300 M VERT.DEPTH, 90 % RECOV. SEAM THICKNESS 0.86 M, DIP 23 DEGS.

Workings at the site

  • Type of workings Underground
    Overall depth 150M
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method ESTIMATE
    Mining Method BREAST STOPING 10-30
    Percent Waste Rock 0
    Percent Recovery 90
    Hardness of Rock HARDROCK WITH LITTLE WATER
    Rock Characteristics ONE SYSTEM OF WEAKNESS PLANES
    Rock Support Chars. SUPPORTING MAY BACK SLAB
    Mine Support Chars. POST, HEADBOARD, CAPS, ROOF BOLTS
    Length of Inclines (m) 460
    Slope of Inclines 23
    Number of Inclines 4
    1st Condition of Workings OPEN
    Capacity 667
    Capacity Units MT ORE/DAY
    Unit Production Cost 21.16
    Units of Production $/MT ORE
    Operating Days per Year 300
    Operating Shifts per Day 2
    Year of Information 1989

Comments on other economic factors

  • IN 1969:AT CAPACITY OF 300,000 STPY (ALL PRODUCTS).
  • 4 INCLINED SHAFTS IN OPERATION (1975);TOTAL OF 10 SUNK. ALL SHAFTS HAVE LEVELS AT 90 M.UNDERGROUND HAULAGE BY RAIL-SORTING & SCREENING BELOW GROUND.INCLINE SHAFTS ALL ABOUT 457 M LONG AND BOTTOM OUT ABOUT 152 M BELOW SURFACE.

Reference information

Bibliographic references

  • Deposit

    JOURNAL OF THE SOUTH AFRICAN INSTITUTE OF MINING AND METAL-

  • Deposit

    LURGY, 1968, CHROMIUM IN SOUTH AFRICA, V. 68.

  • Deposit

    MINERAL RESOURCES OF THE UNION OF SOUTH AFRICA, 1959,

  • Deposit

    CHROMIUM: GEOLOGICAL SURVEY OF SOUTH AFRICA, 4TH. ED.,

  • Deposit

    P. 187-200.

  • Deposit

    RANKIN, G., 1975, CHROMIUM AND FERROCHROMIUM IN SOUTH

  • Deposit

    AFRICA. SAUNDERS AND TAYLOR INC., INVESTMENT INDUSTRY REPORT

  • Deposit

    JOHANNESBERG, SOUTH AFRICA, P. 1-117.

  • Deposit

    METAL BULLETIN.1969.UNION CORPORATION'S ZWARTKOP.DEC.16,

  • Deposit

    1969,PP.25-28.

  • Deposit

    COAL,GOLD&BASE METALS.1975.LONGHOLING HITS GOLD AT ZWARTKOP.

  • Deposit

    V.23,NO.6,PP.15-21.

  • Deposit

    DE WET,J.F.1952.CHROMITE INVESTIGATIONS-PART IV.JOURNAL OF

  • Deposit

    THE CHEMICAL METALLURGICAL&MINING SOC.OF S.AFRICA,VOL.

  • Deposit

    53,NO.1,PP.1-10.

  • Deposit

    WASSERSTEIN,B.1936.CRITICAL ZONE OF THE BUSHVELD GABBRO.

  • Deposit

    TRANS.OF THE GEOL.SOC.OF S.AFRICA.PAPER READ JUNE 23,

  • Deposit

    1936.

  • Deposit

    SIEMS,P.1976.CHROMITE MINES AND RESOURCES OF THE UNION OF

  • Deposit

    SOUTH AFRICA.MINERALS AVAIL.SYSTEM.DEC.1976.PP.21-23.

  • Deposit

    INDUSTRIAL MINERALS . FEB. 1970. THE ZWARTKOP MINE OF CHROME

  • Deposit

    OF SOUTH AFRICA.

  • Deposit

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

  • Deposit

    PRODUCTION", MINTEK SPECIAL PUBL. NO. 11.

  • Deposit

    DAVIDOFF R L, BOYLE E H JR, "NOTES FROM VISIT TO THE RE-

  • Deposit

    PUBLIC OF SOUTH AFRICA", USBM PUBL.

  • Deposit

    GOLDER AND ASSOC., 1981, "DEPOSIT PROFILE - ZWARTKOP,S.A.".

General comments

Subject category Comment text
Deposit ZWARTKOP LOCATED ON SCHILPADNEST & ZWARTKOP FARMS & MINING TITLE HELD TO 3 OTHER FARMS ALONG STRIKE (VLAKPOORT, MIDDELLAAGTE & HAAKDOORNDRIFT).

Reporter information

Type Date Name Affiliation Comment
Reporter 12-MAY-93 Boyle, Ed U.S. Bureau of Mines

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site