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  3. Mineral Resource Data System (MRDS)

Valozoro, Madagascar

Occurrence in Madagascar with commodities Nickel, 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. 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. Reserves and resources
  14. Workings at the site
  15. Links to other databases
  16. Bibliographic references
  17. Reporter information

Geologic information

Identification information

Deposit ID 10079583
MRDS ID W029617
Record type Site
Current site name Valozoro, Madagascar

Geographic coordinates

Geographic coordinates: 47.21778, -21.84667 (WGS84)
Relative position 35 KM SE OF AMBROSITRA

Site location context

Political divisions (FIPS codes)

Madagascar(country)

Africa(continent)

Land(continent)

Geographic areas

Country
Madagascar

Commodities

Commodity Importance
Nickel Critical Primary
Chromium Critical Primary

Materials information

Materials Type of material
Garnierite Ore
Serpentine Ore

Alteration

  • (Local) Serpentinization, Alteration Zone Varies From Nil To 15 Meter.

Analytical data

Result SERPENTINE MASSIVES: S102 38 %, FE203 6 TO 15 %, AL203, 1 TO 3 %, MGO 25 TO 38 %, NI 1.7 TO 4 %, PERIDOTITE: SI02 39.2 %, FE203 5.3 %, AL203 1.3 %, MGO 41 %, NI 0.2 %.

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Harzburgite
    Rock unit name Harzburgite
    Rock description Harzburgite
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Neoproterozoic
  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Harzburgite
  • Host or associated Host
    Rock type Metamorphic Rock > Schist > Mica Schist
    Rock unit name Metasediments
    Rock description Metasediments
  • Host or associated Host
    Rock type Metamorphic Rock > Gneiss

Nearby scientific data

(1) 47.21778, -21.84667
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Major Orogenese Older Than 2,420 Million Years
Type of structure Local
Structure description Harzburgit Dome, 700 M Diameter

Ore body information

  • General form WEDGE, BLANKET

Comments on the geologic information

  • THE HARZBURGIT DOME IS OVERLAIN BY GARNIERITE-BEARING SERPENTINITE AND IN TURN THIS IS COVERT BY NICKELIFEROUS LATERITIC CLAYS.THE HARZBURGIT CONTAINS 0.3 TO 0.4% NICKEL.THE SERPENTINITE CONTAINS2 TO 3 % NICKEL. THE ARGILLACEOUS SERPENTINITE 1.5 TO 2.5 NICKEL, AND THE LATERITIC CLAYS 1.2 % NICKEL. THE AVERAGE TENOR OF THE ORE IS 1.7 TO 1.8 % NICKEL.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Significant No
Discoverer Ungine

Reserves and resources

  • Type In-situ
    Estimate year 1956
    Total resources 65000000mt ore
    Commodity Subtype Grade units Group Importance Year
    Nickel Ni 1.75 wt-pct Nickel Major 1956

Workings at the site

  • Type of workings Surface
    Area 50HA

Comments on development

  • DATA STEMS FROM ONE DRILLHOLE ONLY, FURTHER DRILLING

Reference information

Bibliographic references

  • Deposit

    BESAIRE, HENRI: GITES MINERAUX DE MADAGASCAR (1966)

  • Deposit

    MURDUC, TH.G.: MINERAL RECOURCES OF THE MALAGASY REPUBLIC

  • Deposit

    RAPORT ANNUEL DU SERVICE GEOLOGIQUE POUR 1961

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JAN-1977 Saam, Henning G. U.S. Geological Survey

Beyond USGS

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

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