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  3. Mineral Resource Data System (MRDS)

Bong Range

Past Producer in Bong, 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 10207710
MAS/MILS ID 7650050001
Record type Site
Current site name Bong Range
Alternate or previous names Bong

Geographic coordinates

Point of reference Ore Body
Geographic coordinates: -10.32859, 6.75112 (WGS84)

Site location context

Political divisions (FIPS codes)

Bong(province)

Liberia(country)

Geographic areas

Country State
Liberia Bong

Commodities

Commodity Importance
Iron Primary

Materials information

Materials Type of material
Amphibole Unknown
Chlorite Unknown
Feldspar Unknown
Goethite Unknown
Hematite Unknown
Magnetite Unknown
Mica Unknown
Quartz Unknown

Nearby scientific data

Ore Body (1) -10.32859, 6.75112
ListMap

Economic information

Ore body information

  • Thickness 80M
    Length 9000M
    Width 100M
    Field Value
    MAS Matrix # 1
    MAS Column # 1
    Type of Orebody #1 SEDIMENTARY
    Shape of Orebody #1 TABULAR
    Primary mode of Origin SEDIMENTATION
    Primary Ore Control FOLDING
    Degree of Wallrock Alter. MODERATE
    Date of Last Modification 860620

Comments on the geologic information

  • THE BONG ITABIRITES HAVE BEEN FORMED BY METAMORPHISM OF ORIGINAL CLAYS AND SHALES THAT CONTAINED IRON SECRETIONS. EROSION AND WEATHERING, DURING A LONG PERIOD OF GEOLOGIC TIME, HAVE REMOVED THE SOFTER FORMATIONS AND LEFT THE MORE RESISTANT QUARTZITES AND ITABIRITES AS REEFS. AT BONG THESE REEFS FORM THE CORES OF THE PRESENT MOUNTAIN RANGE. WEATHERING OF THE ITABIRITES HAS PRODUCED A COMPLETE RANGE OF DECOMPOSITION FROM THE UNWEATHERED PRIMARY ITABIRITES TO A DISINTEGRATED MATERIAL CONTAINING POCKETS OF IRON OXIDE. VARYING DEGREES OF THE LEACHING OF QUARTZ ARE EVIDENT IN THE ITABIRITES, AND IT IS IN THE MORE HIGHLY LEACHED MATERIAL THAT THE MINEABLE ORE IS FOUND.

Economic information about the deposit and operations

Operation type Surface
Development status Past Producer
Commodity type Metallic
Significant Yes
Discovery year 1935
Mining method Open Pit
Year of first production 1967
Milling method Washing

Ownership information

  • Type Operator
    Owner Bong Mining Co.
    Year 1982
  • Type Operator
    Owner Liberian Government
    Interest 50
    Year 1982
  • Type Owner
    Owner Ath
    Interest 18
    Year 1982
  • Type Owner
    Owner Italsider
    Interest 16
    Year 1982
  • Type Owner
    Owner Hoesch
    Interest 8
    Year 1982
  • Type Owner
    Owner Krupp
    Interest 4
    Year 1982
  • Type Owner
    Owner Rheinstoh
    Interest 3
    Year 1982

Comments on the production information

  • THE FINAL PRODUCT DISTRIBUTION IS AS FOLLOWS: 70% WEST GERMANY AND 30% ITALY. THERE IS A $11.43 SMELTING COST IN ADDITION TO THE $2.11 MILLING COST FOR PELLETIZATION OF PRODUCT B.

Reserves and resources

  • Type In-situ
    Estimate year 1981
    Measured 318430000mt ore
    Demonstrated 318430000mt ore
    Total resources 318430000mt ore
    Commodity Subtype Grade units Group Importance Year
    Iron Fe 37.4 wt-pct Iron Major 1981
    Iron Fe 37.4 wt-pct Iron Major 1981
  • Type In-situ
    Estimate year 1993
    Demonstrated 288500000mt ore
    Total resources 288500000mt ore
    Commodity Subtype Grade units Group Importance Year
    Iron Fe 35.5 wt-pct Iron Major 1993

Comments on the reserve resource information

  • OW: LIBERIAN GOVT. OW/OP: GERMAN-LIBERIAN MINING CO. IN 1974, WAS THE 2ND LARGEST IRON ORE PRODUCER IN LIBERIA.

Workings at the site

  • Type of workings Surface
    Area 90HA
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Mining Method OPEN PIT
    Percent Waste Rock 50
    Avg. Bench Height (meters) 15
    Capacity 46600
    Capacity Units MT ORE/DAY
    Unit Production Cost 3.25
    Units of Production $/MT ORE
    Operating Days per Year 365
    Operating Shifts per Day 3
    Year of Information 1982

Reference information

Bibliographic references

  • Reserve-Resource

    AME MINERAL ECONOMICS QUARTERLY MINE ANALYSIS, JUN 93,P. 36.

  • Deposit

    BONG MINING COMPANY, TECHNICAL INFORMATION-COMPANY BROCHURE,

  • Deposit

    BONG RANGE, LIBERIA, 1980, 23 P.

  • Deposit

    RICHARDSON, JR., N.R., A BRIEF OUTLINE OF THE MINERAL

  • Deposit

    OCCURRENCES OF LIBERIA, LIBERIAN GEOLOGICAL SURVERY,

  • Deposit

    JULY, 1980, PP 22-26.

  • Deposit

    BERGE, JOHN W., IRON FORMATION AND SUPERGENE IRON ORES OF

  • Deposit

    THE GOE RANGE AREA, LIBERIA, ECONOMIC GEOLOGY, VOL. 66,

  • Deposit

    NO. 6, SEPTEMBER-OCTOBER, 1971, PP 947-960.

  • Deposit

    BERGE, JOHN W., ORIGIN OF GOE RANGE IRON FORMATIONS AND IRON

  • Deposit

    ORES WITH EMPHASIS ON GENETIC IMPLICATIONS OF PHOSPHOROUS

  • Deposit

    AND ALUMINA DISTRIBUTION, 1971, 50 P.

  • Deposit

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

  • Deposit

    FUTURE PROSPECTS, MINING MAGAZINE, SEPTEMBER, 1981,

  • Deposit

    PP 204-208.

Reporter information

Type Date Name Affiliation Comment
Reporter 02-AUG-1994 Bleiwas, Donald 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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