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  3. Mineral Resource Data System (MRDS)

Nimba

Past 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. Alteration
  8. Host and associated rocks
  9. Nearby scientific data
  10. Geologic structures
  11. Ore body information
  12. Economic information about the deposit and operations
  13. Ownership information
  14. Links to other databases
  15. Bibliographic references
  16. General comments
  17. Reporter information

Geologic information

Identification information

Deposit ID 10081083
MRDS ID W032783
Record type Site
Current site name Nimba
Alternate or previous names Mt. Nimba

Geographic coordinates

Geographic coordinates: -8.49858, 7.50106 (WGS84)
Elevation 1300
Relative position 360 KM ENE OF MONROVIA; 270 KM NE OF LJUOC PORT AT BUCHNON

Site location context

Political divisions (FIPS codes)

Nimba(province)

Liberia(country)

Geographic areas

Country State
Liberia Nimba

Comments on the location information

  • NORTHERN SECTOR NIMBA RANGE IS IN GUINEA. RAILWAY FROM NIMBA MINE TO BUCHANON

Commodities

Commodity Importance
Iron Primary

Materials information

Materials Type of material
Goethite Ore
Hematite Ore
Martite Ore
Quartz Gangue

Alteration

  • (Local) Epigenitic During Metamorphism

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock
    Rock unit name Seca Valley Schist (700m) (Lower);Gbahm Ridge (250 M) Phyllite;Nimba Itabirite (250-400 M);Mt. Alpha (100 M) (Upper) Phylitte
    Rock description Seca Valley Schist (700m) (Lower);Gbahm Ridge (250 M) Phyllite;Nimba Itabirite (250-400 M);Mt. Alpha (100 M) (Upper) Phylitte
    Stratigraphic age (youngest) Neoproterozoic
  • Host or associated Host
    Rock type Sedimentary Rock > Chemical Sediment > Iron Formation

Nearby scientific data

(1) -8.49858, 7.50106
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Northeast Strike; Dip 65-80 Nw
Type of structure Local
Structure description Coeneormable With Regional Trend; Sw Plunging Isoclinal Syncline

Ore body information

  • General form FUNNEL-SHAPED SLAB, APEX DOWN
    Strike N 4 SE
    Dip 60-80 NW
    Plunge 80
    Plunge direction SW
    Length 800M
    Width 800M
    Depth to top 0M
    Depth to bottom 670M

Comments on the geologic information

  • FOUR ROCK UNITS LISTED COMPRISE THE NIMBA SUPER GROUP, 1400 M THICK.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1955
Discoverer Clarke, Geologist For Lamco
Year of first production 1963

Ownership information

  • Type Operator
    Owner Lamco Joint Venture Operating Co.
  • Type Owner
    Owner Granges Co. Stockholm, Sweden

Comments on the production information

  • 54 TO 63 PERCENT ORE

Comments on the workings information

  • ANNUAL PRECIPITATION 3000 MM FALLS BETWEEN JUNE AND DECEMBER.

Comments on development

  • LIBERIAN GOVERNMENT OWNS HALF EQUITY IN LAMCO. ; MILL.CAP: 10000 ; ECON.YEAR: 1978

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit 670 M MAXIMUM DEPTH OF DRILLING "MAIN BODY IS THUS OPEN TO DEPTH"

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1980 Gassaway, Judith, S. U.S. Geological Survey

Beyond USGS

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

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