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

Maryland

Producer in Zimbabwe 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. Nearby scientific data
  7. Ore body information
  8. Economic information about the deposit and operations
  9. Mining district
  10. Ownership information
  11. Workings at the site
  12. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10304973
MAS/MILS ID 7960100054
Record type Site
Current site name Maryland

Geographic coordinates

Point of reference Claim
Geographic coordinates: 30.54304, -17.61374 (WGS84)
Elevation 1400
Location accuracy 1000(meters)

Site location context

Political divisions (FIPS codes)

Zimbabwe(country)

Africa(continent)

Land(continent)

Geographic areas

Country
Zimbabwe

Commodities

Commodity Importance
Chromium Critical Primary

Nearby scientific data

Claim (1) 30.54304, -17.61374
ListMap

Economic information

Ore body information

  • Strike N10E
    Dip 20E
    Thickness 0.1M
    Length 7000M
    Width 300M
    Depth to top 50M
    Field Value
    Type of Orebody #1 OTHER
    Shape of Orebody #1 TABULAR
    Primary mode of Origin MAGMATIC DIFFER
    Primary Ore Control IGNEOUS
    Degree of Wallrock Alter. SLIGHT
    Type of Wallrock Alter. #1 OTHER
    Strike And Dip N10E:20E
    Minimum Depth to Top 0
    Avg. Thick. Unconsol. Mat. .5
    Min. Thick. Unconsol. Mat. 0
    Date of Last Modification 830624

Economic information about the deposit and operations

Operation type Underground
Development status Producer
Commodity type Metallic
Significant Yes
Mining method Open Stope - Breast Stoping
Milling method Sizing

Mining district

District name Hartley Complex

Ownership information

  • Type Owner-Operator
    Owner Rhodesian Alloys Ltd. (Rhodall)
    Home office Zimbabwe
    Year 1981

Comments on the ownership information

  • THE OWNERSHIP IS MOST LIKELY DUE TO CHANGE IN THE RECENT FUTURE BECAUSE OF THE REVOLUTION IN ZIMBABWE. IT WILL PROBABLY CHANGE TO AFRICAN CHROME MINES OR ZIMBABWE MINING CO.

Comments on the production information

  • MILL CONCENTRATE GRADE FOR THE YEAR 2049 SET AT 35.96 WT-PCT

Comments on the reserve resource information

  • M1C1=M9C4. 75% PROB. LEVEL IS ESTIMATE OF TONNAGE CONTAINED IN 6 SEAMS (NOS. 4,5,6,7,8 AND 9) ON THE SEAM ASSUMING DOWN DIP EXTENSIONS OF 300 METERS(120 METERS VERTICAL). ESTIMATES OF THICK NESSES OF THE SEAMS ARE .10, .12, .12, .15, .15, AND .10 RESPECTIVELY. ESTIMATES OF STRIKE LENGTHS ARE 5000 METERS FOR SEAM 4 AND SEAM 9 AND 8000 METERS FOR SEAMS 5-8. 50% PROB. EST. ASSUMES A DOWN-DIP EXTENSION FOR SEAM 4, 1200 M FOR SEAM 5, 1200 FOR SEAM 6 AND 2000 METERS FOR SEAMS 7-9. SEAMS 7-9.
  • 1/89 INSITU DEMO.TONNAGE = SEAMS 4,6,AND 7 FOR 300 M ON-DIP. 85 PCT 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 Waste Rock 0
    Percent Recovery 80
    Hardness of Rock HARDROCK WITH LITTLE WATER
    Rock Characteristics MULTIPLE SYSTEMS OF WEAKNESS PLANES
    Rock Support Chars. UNKNOWN
    Mine Support Chars. POST, HEADBOARD, CAPS, ROOF BOLTS
    1st Condition of Workings OPEN
    Capacity 67
    Capacity Units MT ORE/DAY
    Unit Production Cost 79.51
    Units of Production $/MT ORE
    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 ZIMBABWE ON

  • Deposit

    THE AMERICAN FERROCHROME INDUSTRY. PHD THESIS: COLORADO

  • Deposit

    SCHOOL OF MINES. 1981.

  • Deposit

    GOLDER ASSOCIATES. "DEPOSIT PROFILE: SELUKWE PEAK, ZIMBABWE"

  • Deposit

    1980.

  • Deposit

    GOLDER ASSOCIATES. "DEPOSITS PROFILE: SUTTON, VANAD, CAESAR,

  • Deposit

    ZIMBABWE." 1981.

  • Deposit

    GOLDER ASSOCIATES. "DEPOSIT PROFILE: AFRICAN CHROME MINES,

  • Deposit

    LTD. ZIMBABWE." 1981.

  • Deposit

    MINISTRY OF MINES. "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 DEPOSIT. HOWEVER, SEAMS 1,2, AND 3 APPEAR TO HAVE BEEN DE- PLETED. 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) (2032-2060) (2061-2083) (2084-2102) (2103-2121) 52YR.LIFE 29YR.LIFE 23YR.LIFE 19YR.LIFE 19YR.LIFE SOUTH OF MARYLAND SIDING TO 8 KM. NORTH OF MARYLAND SIDING -(WEST SIDE OF DYKE). INFORMATION FROM 1981 INDICATES THAT RHODAL WAS PRODUCING FROM OPERATIONS IN THE MARYLAND AREA. THIS ANALYSIS TREATS A SINGLE SECTION OF THE GREAT DYKE- THE "MARYLAND SECTION" - AS ONE MINING UNIT. IN REALITY, MORE THAN ONE COMPANY MAY HOLD LEASES OVER THE SECTION DESCRIBED AND MORE THAN ONE COM PANY COULD BE PRODUCING SIMULTANEOUSLY FROM THE SECTION. TO ANALYZE THE GREAT DYKE FOR AVAILABILITY, IT WAS NECESSARY TO ADDRESS THE SITUATION IN A LOGICAL, COMPARTMENTALIZED FORMAT . HENCE, THE "MARYLAND SECTION: REFERS TO A 9 KM SECTION COVERING THE WEST LIMB OF THE GREAT DYKE SYNCLINE FROM ABOUT 1 KM SOUTH OF MARYLAND SIDING.

Reporter information

Type Date Name Affiliation Comment
Reporter 19-AUG-92 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