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Andriamena

Producer in Madagascar with commodities Chromium, 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. Mining district
  11. Ownership information
  12. Production statistics
  13. Workings at the site
  14. Links to other databases
  15. Bibliographic references
  16. Reporter information

Geologic information

Identification information

Deposit ID 10135079
MAS/MILS ID 7880150001
Record type Site
Current site name Andriamena
Alternate or previous names Ankazatolana

Geographic coordinates

Point of reference Main Entrance
Geographic coordinates: 47.50107, -17.26366 (WGS84)
Elevation 1250
Location accuracy 100(meters)

Site location context

Political divisions (FIPS codes)

Madagascar(country)

Africa(continent)

Land(continent)

Geographic areas

Country
Madagascar

Commodities

Commodity Importance
Chromium Critical Primary
Iron Tertiary

Materials information

Materials Type of material
Chlorite Unknown
Chromite Unknown
Pyroxene Unknown
Talc Unknown
Tremolite Unknown

Nearby scientific data

Main Entrance (1) 47.50107, -17.26366
ListMap

Economic information

Ore body information

  • Strike N35W
    Dip 70E
    Thickness 2M
    Length 200M
    Width 100M
    Depth to top 100M
    Field Value
    MAS Matrix # 1
    MAS Column # 3
    Type of Orebody #1 OTHER
    Shape of Orebody #1 LENTICULAR
    Shape of Orebody #2 IRREGULAR
    Primary mode of Origin MAGMATIC DIFFER
    Primary Ore Control LITHOLOGY
    Secondary Ore Control FRACTURING
    Degree of Wallrock Alter. INTENSE
    Type of Wallrock Alter. #1 OTHER
    Strike And Dip N35W:70E
    Minimum Depth to Top 0
    Avg. Thick. Unconsol. Mat. 2
    Min. Thick. Unconsol. Mat. 0
    Date of Last Modification 830718
  • Area 200HA
    Field Value
    Total Surface Area (HA) 200
    Date of Last Modification 910418

Comments on the geologic information

  • THERE ARE OVER 1100 LENSES OF CHROMITE OVER AN AREA OR 50 SQUARE KM. THE BEMANEVIKA LENS IS THE LARGEST WITH MORE THAN 2 MILLION TONS OF ORE; OTHERS VARY FROM A FEW THOUSAND TO 200000 TONS EACH. 3 TYPES OF DEPOSITS ARE PRESENT: PYROXENITIC LENSES INTER- CALATED WITH GNEISS, LENSES WITHIN TALC SCHISTS, INTER- STRATIFIED WITHIN GNEISSIC OR AMPHIBOLITIC SERIES, AND INTERSTRATIFIED LENSES, AT TIMES MASSIVE.

Economic information about the deposit and operations

Operation type Surface
Development status Producer
Commodity type Metallic
Significant Yes
Discovery year 1952
Mining method Bench (Berm)
Year of first production 1964
Milling method Gravity

Mining district

District name Andriamenha

Ownership information

  • Type Operator
    Owner Kraomita Malagasy
    Home office Malagasy Rep.
    Year 1981
  • Type Owner
    Owner Government Of Malagasy Rep.
    Interest 100
    Home office Malagasy Rep.
    Year 1981

Production statistics

  • Year 1980
    Description Chromite Output-Conc. Out-33.7%; Input-21.4% 263000 Mt Ore/Yr
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Chromium Chromium 34wt-pct

Comments on the production information

  • PRODUCING 1976. SIEMS SAYS PRODUCING SINCE 1969. METALS SOURCEBOOK SAYS START-UP IN 1974. CAPACITY, 1974: 154,200 MTPY CHROMITE ORE TO BE TREATED AT BEMANIVIKA MILL OPERATING AT 80% OF CAPACITY. METERS IN LENGTH. THESE LARGER LENSES WERE AMONG A TOTAL OF OUTPUT CAPACITY, 1976: 156,500 MTPY OF 48-49% CR2O3. WITH ORE BEING TREATED AT A CENTRAL MILLING PLANT (ASSUME BEMANIVIKA MILL) WHICH WAS ALSO TREATING ORE FROM THE BEFANDRIANA PIT (OUTPUT ATTRIBUTED TO BEFANDRIANA PIT ORE WAS 41,087 MTPY OF 48-49% CR2O3). FINAL PRODUCT FROM MILL ATTRIBUTED TO ANKAZATOLANA ORE IS TRANSPORTED TO TAMATAVE HARBOR(ASSUME TRUCKING 680 KM). THE ANKAZATOALANA PIT WAS AT A DEPTH OF 100 METERS.

Comments on the reserve resource information

  • 1/89 INSITU DEMO.TONNAGE = SURFACE MINEABLE ONLY. ANKAZATOALANA = 36.6 % OF TONNAGE, BEMANEVIKA= 29.9 % OF TONNAGE.
  • FOR ANALYSIS: 205,000 MTPY ROM FOR: 20,570 MTPY LUMP AT 42 % CR2O3, 32,000 MTPY CONCS.AT 48 % CR2O3 AND 50,000 MTPY DE- PHOSPHORIZED CONCS. AT 49.5 % CR2O3. ALL PRODUCTS FOR EXPORT THROUGH TAMATAVE PORT AS CHROMITE MET PRODUCTS.
  • IT IS ESTIMATED THAT APPROXIMATELY 4,400,000 MT OF RESERVE IS LEFT AT ANKAZATOALANA PIT AS OF 1980 BASED ON ESTIMATES REPORTED AT START OF MINING AND EST. PRODUCTION FROM 1974- 1980. COMPANY OFFICIALS HAVE MENTIONED TOTAL DISTRICT RESOURCES AT 10,000,000 MT WHICH IS PROBABLY A CONSERVATIVE ESTIMATE. FOR PURPOSES OF ANALYSIS THE REMAINING 5,500,000 MT OF RESOURCE IS ASSUMED PRESENT AT THE OLD BEMANEVIKA PIT WHICH WOULD HAVE TO BE REHABILITATED PLUS AT LEAST 25 OTHER SEPARATE LENSES WITH AVERAGE DIMENSIONS OF 100 METERS LONG BY 9 METERS THICK BY 50 METERS DEEP. THE AMOUNT OF LUMP ORE ACTUALLY PRODUCED AT THE BEMANEVIKA MILL IS NOT KNOWN. IT HAS BEEN ASSUMED HOWEVER FOR CODING THAT THE AMOUNT IS VERY SMALL (ONLY 5% OF TOTAL PRODUCTS OUT). THE ASSUMPTION WAS MADE BECAUSE OF THE RELATIVELY LOW GRADE OF RUN OF THE MINE ORE AT ANKAZATOALANA. M1C3 = M9C4.

Workings at the site

  • Type of workings Surface
    Area 100HA
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method PROPOSED
    Mining Method BENCH (BERM)
    Percent Waste Rock 87.5
    Hardness of Ore M-HARD ROCKS
    Avg. Bench Height (meters) 10
    Max. Pit Slope (degrees) 40
    Capacity 1052
    Capacity Units MT ORE/DAY
    Unit Production Cost 7.6
    Units of Production $/MT ORE
    Operating Days per Year 250
    Operating Shifts per Day 2
    Year of Information 1981
  • Type of workings Surface
    Area 100HA
    Field Value
    MAS Development Schedule # 1
    Mining Record # 2
    Status of Mining Method PROPOSED
    Mining Method BENCH (BERM)
    Percent Waste Rock 93.8
    Hardness of Ore M-HARD ROCKS
    Avg. Bench Height (meters) 10
    Max. Pit Slope (degrees) 40
    Capacity 1052
    Capacity Units MT ORE/DAY
    Preprod. Stripping Vol. 150
    Unit Production Cost 46.3
    Units of Production $/MT ORE
    Operating Days per Year 250
    Operating Shifts per Day 2
    Year of Information 1981

Reference information

Bibliographic references

  • Reserve-Resource

    BUR. GEOL. MADAGASCAR, DOC. NO. 151, 1960 PG. 123-124

  • Reserve-Resource

    PERSONAL COMMUNICATION WITH MINE PERSONNEL, AUG. 1981

  • Deposit

    SIEMS, P. 1975. REPORT ON MALAGASY REPUBLIC CHROMITE.

  • Deposit

    WORLD MINING YEARBOOK. 1977. PP. 151-152.

  • Deposit

    METALS SOURCEBOOK. OCT. 14, 1974. ITEM B4633.

  • Deposit

    AFRICA. TANANARIVE. SHEET 32. SCALE 1:2,000,000. DEFENSE

  • Deposit

    MAPPING AGENCY. STOCK NO. 2201X32.

  • Deposit

    BESAIRE, H. LES RESOURCES MINERALES DE MADAGASCAR REPUBLIC

  • Deposit

    THE TEX REPORT, CHROME MINES IN MADAGASCAR, TOKYO, 1978,

  • Deposit

    PP. 108-109

Reporter information

Type Date Name Affiliation Comment
Reporter 19-APR-95 Eastern Field Operations Center (EFOC) 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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