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  3. Mineral Resource Data System (MRDS)

Moanda

Producer in Gabon with commodity Manganese
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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. Host and associated rocks
  8. Nearby scientific data
  9. Ore body information
  10. Economic information about the deposit and operations
  11. Ownership information
  12. Reserves and resources
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10079682
MRDS ID W029761
Record type Site
Current site name Moanda
Alternate or previous names Bangombe, Okouma, Okoumadzoundou, Ogooue

Geographic coordinates

Geographic coordinates: 13.28475, -1.56495 (WGS84)
Elevation 580
Relative position CA. 40 KM WEST OF FRANCEVILLE

Site location context

Political divisions (FIPS codes)

Gabon(country)

Geographic areas

Country
Gabon

Comments on the location information

  • TWO MAIN OREBODIES: BANGOMBE (BEING MINED AT PRESENT) AND OKOUMA

Commodities

Commodity Importance
Manganese Critical Primary

Materials information

Materials Type of material
Lithiophorite Ore
Manganite Ore
Polianite Ore
Pyrolusite Ore
Rhodochrosite Ore
Illite Gangue
Kaolinite Gangue
Limonite Gangue

Analytical data

Result 50 % MN
Result AL2O3: 6-7 %
Result FE: 3-4 %
Result SIO2: 2-3.5 %
Result P: 0.1-0.15 %

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Syenite
    Stratigraphic age (youngest) Neoproterozoic
  • Host or associated Associated
    Rock type Plutonic Rock
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Shale > Black Shale
    Rock unit name Francevillian, Transition Zone 0.5-1.0 M Thick Containing Ore;Francevillian, Plaquette-Ore 5 M Thick;Francevillian, Compact Layer Of Ore 0.1-0.5 M Thick;Bituminous Schists
    Rock description Francevillian, Transition Zone 0.5-1.0 M Thick Containing Ore;Francevillian, Plaquette-Ore 5 M Thick;Francevillian, Compact Layer Of Ore 0.1-0.5 M Thick;Bituminous Schists
    Stratigraphic age (youngest) Precambrian
    Chronological age 1170

Nearby scientific data

(1) 13.28475, -1.56495
ListMap

Economic information

Ore body information

  • General form BLANKET

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Significant No
Discovery year 1934
Discoverer Choubert, B. & Berge, J.
Year of first production 1962

Ownership information

  • Type Operator
    Owner Comilog
  • Type Owner
    Owner See Exploration Comments

Reserves and resources

  • Type In-situ
    Estimate year 1974
    Total resources 230000000000mt ore
    Commodity Subtype Grade units Group Importance Year
    Manganese Mn 50 wt-pct Manganese Major 1974

Comments on development

  • COMILOG (COMPAGNIE MINIERE DE L'OGOOUE) US-STEEL 44 %, BRGM 19 %, COMPAGNIE DE MOKTA 17 %, SAMAF (SOC. AUXILIAIRE DE MANGANESE DU FRANCEVILLE) 9 %, REPUBLIC OF GABON 10 % ; ECON.COM: MINING CAPACITY IS LIMITED TO 2.7 MILLION TONS BY THE ROPEWAY-RAILWAY TRANSPORTING THE ORE OVER A DISTANCE OF 76 KM TO MBINDA. RAILWAY CONNECTION MBINDA-POINTE NOIRE (HARBOUR) 485 KM

Reference information

Bibliographic references

  • Deposit

    WEISS, S. 1977: MANGANESE THE OTHER USES. METAL BULL. BOOKS LTD. LONDON

  • Deposit

    SCHWARTZ, M. 1976: ROHSTOFFWIRTSCHAFTLICHE LAENDERBERICHTE NO.9 GABUN, VR-KONGO UND KAMERUN. BGR, HANNOVER 1976

  • Deposit

    WEBER, F.1973: GENESIS AND SUPERGENE EVOLUTION OF THE PRECAMBRIAN SEDIMENTARY MANGANESE DEPOSIT AT MOANDA (GABON) UNESCO, PROC. KIEV. SYMPOS, 1970

  • Deposit

    DEYOUNG AND OTHERS, 1984: U.S. GEOLOGICAL SURVEY CIRCULAR 930-A, 22 P.

  • Production

    SKILLINGS, 15.5.76 INDUSTRIES ET TRAVAUX D'OUTRE MER AUGUST 1974

  • Reserve-Resource

    WEISS, S. 1976 MANGANESE THE OTHER USES P.58

General comments

Subject category Comment text
Deposit SEE FORMATION NAMES UNDER GEOLOGY. DEPOSITS AT THE TOP OF PLATEAUS.
Deposit RADIOMETIC DATING: 1740 (+-) 20 MY FOR FRANCEVILLIAN. DEEP BANGOMBE BOREHOLE ENCOUNTERED A LAYER OF MN-CARBONATES WHICH MAY BE PRIMARY ORE THAT HAS BEEN ENRICHED BY WEATHERING PROCESSES NEAR THE SURFACE

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1978 Krauss, Ulrich H. U.S. Geological Survey
Updater 01-JAN-1988 Orris, Greta J. U.S. Geological Survey

Beyond USGS

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

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