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

Crown Divide North

Producer in Midlands, Zimbabwe with commodity Chromium
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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. 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 10207436
MAS/MILS ID 7960250051
Record type Site
Current site name Crown Divide North

Geographic coordinates

Point of reference Claim
Geographic coordinates: 30.61803, -17.48035 (WGS84)
Elevation 1400
Location accuracy 1000(meters)

Site location context

Political divisions (FIPS codes)

Midlands(province)

Zimbabwe(country)

Africa(continent)

Land(continent)

Geographic areas

Country State
Zimbabwe Midlands

Commodities

Commodity Importance
Chromium Critical Primary

Materials information

Materials Type of material
Chromite Unknown
Olivine Unknown
Pyroxene Unknown

Nearby scientific data

Claim (1) 30.61803, -17.48035
ListMap

Economic information

Ore body information

  • Strike N10E
    Dip 18W
    Thickness 0.1M
    Length 4000M
    Width 300M
    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 LITHOLOGY
    Degree of Wallrock Alter. SLIGHT
    Type of Wallrock Alter. #1 OTHER
    Strike And Dip N10E:18W
    Minimum Depth to Top 0
    Avg. Thick. Unconsol. Mat. .5
    Min. Thick. Unconsol. Mat. 0
    Date of Last Modification 820913

Economic information about the deposit and operations

Operation type Underground
Development status Producer
Commodity type Metallic
Significant No

Mining district

District name Hartley Complex

Ownership information

  • Type Owner-Operator
    Owner Zimbabwe Mining And Smelting Co. (Zimasco)
    Interest 100
    Home office Zimbabwe
    Year 1981

Comments on the reserve resource information

  • 75% PROBABILITY LEVEL IS ESTIMATE OF TONNAGE CONTAINED IN 6 SEAMS (NO.S 4, 5, 6, 7, 8 AND 9) FOR A DOWN DIP EXTENSION OF 300 METERS (ABOUT 125 METERS VERTICAL DEPTH). ESTIMATED THICKNESSES FOR THE 6 SEAMS ARE .10,.12,.12..15,.15 AND .10 METERS RESPECTIVELY. ESTIMATED STRIKE LENGTHS OF OUTCROPS OF THE 6 SEAMS ON THE SECTION ARE 4,000 METERS FOR ALL 6 SEAMS. 50% PROBABILITY LEVEL TONNAGE ESTIMATE IS MADE ASSUMING EXTENSIONS DOWN DIP OF 1000 METERS FOR SEAM 4, 1200 METERS FOR SEAMS 5&6, AND 1500 METERS FOR SEAMS 7,8, AND 9.

Workings at the site

  • Type of workings Underground
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method ACTUAL
    Mining Method RESUING 10-61
    Percent Waste Rock 0
    Percent Recovery 80
    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
    Slope of Inclines 18
    Number of Inclines 24
    1st Condition of Workings OPEN
    Capacity 67
    Capacity Units MT ORE/DAY
    Operating Days per Year 300
    Operating Shifts per Day 2
    Year of Information 1981

Reference information

Bibliographic references

  • Deposit

    BALLEN, R. COST ESTIMATION FOR SOUTH AFRICAN CHROMITE MINE.

  • Deposit

    1979.

  • Deposit

    BALLEN, R. THE IMPLICATIONS OF SOUTH AFRICA AND ZIMBABAWE ON

  • Deposit

    THE AMERICAN FERROCHROME INDUSTRY.PHD THESIS: COLORADO

  • Deposit

    SCHOOL OF MINES. 1981.

  • Deposit

    GOLDER ASSOCIATES. "DEPOSIT PROFILES:SELUKWE PEAK,ZIMBABAWE"

  • Deposit

    1980.

  • Deposit

    GOLDERASSOCIATES."DEPOSIT PROFILES:SUTTON, VANAD, CAESAR,

  • Deposit

    ZIMBABAWE." 1981.

  • Deposit

    GOLDER ASSOCIATES. "DEPOSIT PROFILE:AFRICAN CHROME MINES,

  • Deposit

    LTD. ZIMBABAWE." 1981.

  • Deposit

    MINISTRY OF MINIES. "CHROMIUM MINING." PUBLICATION NO.3.

  • Deposit

    PP.1-3.

  • Deposit

    PERSONAL COMMUNICATION, 1981.

  • Deposit

    WORST, B.S. THE GREAT DYKE OF SOUTHERN RHODESIA. (INCLUDING

  • Deposit

    GEOLOGICAL MAP OF THE DYKE SHEETS 1-9). PP. 1-235.

General comments

Subject category Comment text
Deposit THERE ARE 9 SEAMS THAT MAKE UP THE CROWN/DIVIDE NORTH SECTION. HOWEVER, SEAMS 1,2, AND 3 APPEAR TO HAVE BEEN DEPLETED. SEAMS 4& 5 PROPOSED TO BE MINED AND SEAMS 6 & 7 ARE PRESENTLY BEING MINED. THE INDIVIDUAL SEAM LIFES ARE: SEAM SEAM SEAM SEAM SEAM #6 & 7 #8 #5 #4 #9 ----- ----- ----- ----- ----- (1980-2031) (2030-2060) (2061-2083) (2084-2102) (2103-2121) 52YR. LIFE 29YR. LIFE 23YR. LIFE 19YR. LIFE 19YR. LIFE THE Q-RESERVES WERE DERIVED FROM DIMENSIONAL DATA. THE INDIVIUAL SEAM LIFES ARE GIVEN ABOVE. HOWEVER, DUE TO LIMITS ON MINE LIFE ENTRY, THE ENDING YEAR OF THE MINE WILL BE 2049. FROM 1980 TO 2031 SEAMS 6 & 7 WILL BE MINED WITH A FEED GRADE OF 51.1; FROM 2032 TO 2049 A WEIGHTED AVERAGE WILL BE USED TO REPRESENT A MINE LIFE FROM 2032 TO 2121. THE REPRESENTATIVE ORE/FEED GRADE % WILL BE 50.52 FOR SEAMS 8,5,4, AND 9. HOWEVER, TO GET ONE UNIQUE GRADE% OF CR2O3 THE TWO NUMBERS WERE WEIGHT AVERAGED TO END WITH A ORE FEED GRADE % OF 50.5 AND A CONC. GRADE OF 50.89% CR2O3. THE ENTIRE MINE LIFE IS 142 YRS. INFORMATION FROM 1981 INDICATES THAT AFRICAN MINES WAS PRODUCING FROM OPERATIONS IN THE CROWN/DIVIDE NORTH SECTION. THIS ANALYSIS TREATS A SINGLE SECTION OF THE GREAT DYKE AS ONE MINEABLE UNIT, THE "CROWN/DIVIDE NORTH SECTION". IN REALITY MORE THAN ONE COMPANY MAY HOLD LEASES FOR THE AREA COVERED BY ONE OF THESE SECTIONS AND MORE THAN ONE MINE COULD BE PRODUCING SIMULTANEOUSLY. TO ANALIZE THE GREAT DIVIDE FOR AVAILABILITY IT WAS NECESSARY TO ADDRESS THE SITUATION IN A LOGICAL, COMPARTMENTALIZED FORMAT. HENCE, THE "CROWN/DIVIDE NORTH SECTION" REFERS TO A 4KM SECTION FROM DIVIDE NORTH (S 17 DEG. 30 MIN.) TO ABOUT 1KM SOUTH OF MAQUADZI AND ONLY COVERS CHROMITE SEAMS OF THE EAST LIMB OF THE GREAT DYKE IN THIS AREA. IT IS BELIEVED TO COVER PRODUCTION FROM 2 CLAIMS IN 1980; DIVIDE NORTH AND CROWN 18.

Reporter information

Type Date Name Affiliation Comment
Reporter 27-FEB-1984 Boyle, Ed U.S. Bureau of Mines

Beyond USGS

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

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