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  3. Mineral Resource Data System (MRDS)

Nimba/Yekepa

Producer in Nimba, Liberia with commodity Iron
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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. Ownership information
  11. Reserves and resources
  12. Workings at the site
  13. Links to other databases
  14. Bibliographic references
  15. Reporter information

Geologic information

Identification information

Deposit ID 10135214
MAS/MILS ID 7650400001
Record type Site
Current site name Nimba/Yekepa
Alternate or previous names Nimba

Geographic coordinates

Point of reference Ore Body
Geographic coordinates: -8.46548, 7.58495 (WGS84)
Location accuracy 5000(meters)

Site location context

Political divisions (FIPS codes)

Nimba(province)

Liberia(country)

Geographic areas

Country State
Liberia Nimba

Commodities

Commodity Importance
Iron Primary

Materials information

Materials Type of material
Clay Unknown
Feldspar Unknown
Goethite Unknown
Hematite Unknown
Mica Unknown
Quartz Unknown

Nearby scientific data

Ore Body (1) -8.46548, 7.58495
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Economic information

Ore body information

  • Field Value
    MAS Matrix # 1
    MAS Column # 1
    Type of Orebody #1 SEDIMENTARY
    Shape of Orebody #1 TABULAR
    Primary mode of Origin SEDIMENTATION
    Secondary mode of Origin METAMORPHISM
    Primary Ore Control FOLDING
    Degree of Wallrock Alter. SLIGHT
    Date of Last Modification 860620

Comments on the geologic information

  • THE FORMATIONS IN THIS AREA WERE ORIGINALLY DEPOSITED IN A PRECAMBRIAN SEA AS SANDS, SILTS AND IRON LADEN MUDS. DURING SUBSEQUENT MOUNTAIN CHAIN FOLDINGS THESE SEDIMENTS HARDENED INTO "ITABIRITES" (40-50% FE). THE HIGH-GRADE ORE DEPOSITS ARE THOUGHT TO HAVE FORMED THROUGH INTENSE WEATHERING OF THE ITABIRITES. THE LARGEST ORE BODY AT NIMBA, THE "MAIN OREBODY", IS 1.5 KM LONG, 400 M WIDE AND MORE THAN 600 M DEEP IN THE CENTER.

Economic information about the deposit and operations

Operation type Surface
Development status Producer
Commodity type Metallic
Significant Yes
Discovery year 1955
Year of first production 1963

Ownership information

  • Type Owner-Operator
    Owner Lamco - Joint Venture Operating Co.
    Interest 75
    Year 1982
  • Type Owner
    Owner Libeth
    Interest 25
    Year 1982

Comments on the ownership information

  • OW: LIBERIAN GOVT. OW/OP: LAMCO JT.VENTURE OPERATING CO. FORMERLY MOUNT NIMBA MINE.

Comments on the production information

  • PRODUCTON OF PELLETS CEASED IN 1979. FINAL PRODUCT DISTRIBUTION FOR SINTER FINES IS AS FOLLOWS: WEST EUROPE 38%, USA 25%, JAPAN 17%, SOUTH EUROPE 15% AND UNITED KINGDOM 5%.

Reserves and resources

  • Type In-situ
    Estimate year 1981
    Measured 84700000mt ore
    Demonstrated 84700000mt ore
    Total resources 84700000mt ore
    Commodity Subtype Grade units Group Importance Year
    Iron Fe 65 wt-pct Iron Major 1981
    Iron Fe 65 wt-pct Iron Major 1981

Comments on the reserve resource information

  • 1988 YEARBOOK-PETER KUCK

Workings at the site

  • Type of workings Surface
    Area 80HA
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Mining Method OPEN PIT
    Percent Waste Rock 56
    Avg. Bench Height (meters) 10
    Max. Pit Slope (degrees) 45
    Capacity 22400
    Capacity Units MT ORE/DAY
    Unit Production Cost 2.24
    Units of Production $/MT ORE
    Operating Days per Year 312
    Operating Shifts per Day 3
    Year of Information 1982

Comments on other economic factors

  • THE DESIGN CAPACITY OF THE MILL IS 12.5 MILLION METRIC TONS OF ORE INPUT PER YEAR. CURRENTLY THE MILL INPUT IS AT 7 MILLION METRIC TONS OF ORE PER YEAR.

Reference information

Bibliographic references

  • Deposit

    IRON AND MANGANESE ORES SURVEY, METAL BULLETIN, METAL

  • Deposit

    BULLETIN LTD., PP 89-91.

  • Deposit

    WEISSENBORN, A.E., LIBERIAN IRON ORE REPORT, U.S. GEOLOGICAL

  • Deposit

    SURVEY, APRIL, 1963.

  • Deposit

    WORLD MINING, WHY LAMCO/JV WILL STRIP 17,000,000 CUBIC YARDS

  • Deposit

    OVERBURDEN WITH SCRAPERS, JANUARY, 1971, PP 30-32.

  • Deposit

    NOREN, T.A.B, AND COOK, J.B., ORE HANDLING AT NIMBA, MINING

  • Deposit

    MAGAZINE, MARCH, 1970, VOL. 122, NO. 3, PP 168-177.

  • Deposit

    SUBAH, PEWU, IRON ORE IN LIBERIA: PAST PRODUCTION AND FUTURE

  • Deposit

    PROSPECTS, MINING MAGAZINE, SEPTEMBER, 1981, PP 204-208.

  • Deposit

    MINING MAGAZINE, LAMCO PREPARES FOR THE NEXT DECADE,

  • Deposit

    SEPTEMBER, 1979, PP 192-197.

  • Deposit

    LINDBERG, T., EXPERIENCE WITH THE JONES' SEPARATOR AT

  • Deposit

    BUCHANAN, MINING MAGAZINE, SEPTEMBER, 1979, PP 199-207.

  • Deposit

    BERGE, J.W., JOHANSSON, K., AND JACK, J., GEOLOGY AND ORIGIN

  • Deposit

    OF THE HEMATITE ORES OF THE NIMBA RANGE, LIBERIA, ECONOMIC

  • Deposit

    GEOLOGY, VOL. 72, 1977, PP 582-607.

Reporter information

Type Date Name Affiliation Comment
Reporter 26-JAN-95 Bolis 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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