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  3. Mineral Resource Data System (MRDS)

Ranomena

Past Producer in Toamasina, Madagascar with commodity Chromium
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Nearby scientific data
  7. Ore body information
  8. Economic information about the deposit and operations
  9. Mining district
  10. Ownership information
  11. Workings at the site
  12. Links to other databases
  13. Bibliographic references
  14. Reporter information

Geologic information

Identification information

Deposit ID 10280490
MAS/MILS ID 7880100001
Record type Site
Current site name Ranomena

Geographic coordinates

Point of reference Ore Body
Geographic coordinates: 49.18434, -18.0302 (WGS84)
Elevation 1300
Location accuracy 100(meters)

Site location context

Political divisions (FIPS codes)

Toamasina(province)

Madagascar(country)

Africa(continent)

Land(continent)

Geographic areas

Country State
Madagascar Toamasina

Commodities

Commodity Importance
Chromium Critical Primary

Nearby scientific data

Ore Body (1) 49.18434, -18.0302
ListMap

Economic information

Ore body information

  • Thickness 5M
    Length 700M
    Width 300M
    Field Value
    Type of Orebody #1 OTHER
    Shape of Orebody #1 LENTICULAR
    Primary mode of Origin MAGMATIC DIFFER
    Secondary mode of Origin METAMORPHISM
    Primary Ore Control IGNEOUS
    Secondary Ore Control BEDDING
    Degree of Wallrock Alter. UNKNOWN
    Date of Last Modification 830713

Economic information about the deposit and operations

Operation type Surface
Development status Past Producer
Commodity type Metallic
Significant Yes
Discovery year 1916
Mining method Bench (Berm)
Year of first production 1960
Milling method Gravity

Mining district

District name Ranomena Mine

Ownership information

  • Type Owner
    Owner Malagasy Republic Government
    Interest 100
    Home office Malagasy Rep.
    Year 1981

Comments on the reserve resource information

  • M1C1 + M1C2 = M9C4. M9C4 REPRESENTS AVERAGE GRADE FOR CR2O3.
  • 1/89 INSITU DEMO.TONNAGE= 100,000 MT "SURFACE" ORE AT 41 % CR2O3 AND 150,000 MT "SUBSURFACE" ORE AT 33 % CR2O3.
  • Q-MAT 1, COL. 1 MATERIAL HAS CR/FE RATIO OF 1.3/1.0 (LOW GRADE). Q-MAT.1, COL. 2 MATERIAL HAS CR/FE OF 1.5/1.0 (HIGH GRADE).
  • LAST PRODUCED IN 1963. FOR ANALYSIS: SURFACE ORE = FIRST 5 YRS.PROD.= 20,000 MTPY ROM FOR: 13,666 MTPY CONCS.AT 48 % CR2O3. SUBSURFACE ORE = MEXT 5 YRS.PROD.= 25,000 MTPY ROM FOR: 11,790 MTPY CONCS.AT 49 % CR2O3. ALL CONC.PRODUCTS ANALYZED AS CHROMITE CHEM IN FINAL AVAIL.STUDY. 10 LENSES OF CHROMITE ORE, ALL WITH THICKNESS OF LESS THAN 5 M.

Workings at the site

  • Type of workings Surface
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method PROPOSED
    Mining Method BENCH (BERM)
    Percent Waste Rock 89
    Hardness of Ore M-HARD ROCKS
    Avg. Bench Height (meters) 5
    Max. Pit Slope (degrees) 40
    Capacity 80
    Capacity Units MT ORE/DAY
    Unit Production Cost 8.03
    Units of Production $/MT ORE
    Operating Days per Year 250
    Operating Shifts per Day 2
    Year of Information 1981
  • Type of workings Surface
    Field Value
    MAS Development Schedule # 1
    Mining Record # 2
    Status of Mining Method PROPOSED
    Mining Method BENCH (BERM)
    Percent Waste Rock 69
    Hardness of Ore M-HARD ROCKS
    Avg. Bench Height (meters) 5
    Max. Pit Slope (degrees) 40
    Capacity 80
    Capacity Units MT ORE/DAY
    Preprod. Stripping Vol. 0
    Unit Production Cost 8.03
    Units of Production $/MT ORE
    Operating Days per Year 250
    Operating Shifts per Day 2
    Year of Information 1981

Reference information

Bibliographic references

  • Deposit

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

  • Deposit

    BESAIRIE, H. GITES MINERAUX DE MADAGASCAR. BUREAU DE

  • Deposit

    RECHERCHE GEOLOGIQUE ET MINIERE. MADAGASCAR. 1968.

  • Deposit

    PP. 118-120.

Reporter information

Type Date Name Affiliation Comment
Reporter 19-AUG-1992 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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