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  3. Mineral Resource Data System (MRDS)

Piraja

Prospect in Bahia, Brazil with commodities Magnesite, Gemstone, Quartz
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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. Mining district
  12. Ownership information
  13. Links to other databases
  14. Bibliographic references
  15. Reporter information

Geologic information

Identification information

Deposit ID 10065519
MRDS ID TC40859
Record type Site
Current site name Piraja

Geographic coordinates

Geographic coordinates: -41.57533, -14.14491 (WGS84)
Location accuracy 10000(meters)
Relative position IN PIRAJA VALLEY, 3.6 KM SW OF PEDRA PETRA CAMP.

Site location context

Political divisions (FIPS codes)

Bahia(province)

Brazil(country)

South America(continent)

Land(continent)

Geographic areas

Country State
Brazil Bahia

Commodities

Commodity Importance
Magnesite Primary
Gemstone Primary
Quartz Primary

Comments on the commodity information

  • IN THE DISTRICT, KYANITE, TOURMALINE, TOPAZ, BERYL, PHLOGOPITE IN OPEN FISSURES AND VUGS LINED WITH MAGNESITE CRYSTALS AND QUARTZ. KYANITE, TOURMALINE, PHLOGOPITE, AND DOLOMITE WERE OBSERVED IN COARSE-GRAINED TALC. KYANITE WAS MOST COMMON. BERYLS ARE GREEN AND BLUE. TOPAZ IS LEAST COMMON.

Materials information

Materials Type of material
Emerald Ore
Magnesite Ore
Quartz Ore
Enstatite Gangue
Talc Gangue

Analytical data

Result MAGNESITE (11 SAMPLES): 0.96% CAO, 0.04% MNO
Result RED MAGNESITE (1 SAMPLE): 1.78% FE2O3, 0.49% AL2O3
Result WHITE MAGNESITE (10 SAMPLES): 0.49% FE2O3
Result 0.49% AL2O3
Result MAGNESITE (12 SAMPLES): 0.20-45.58% SIO2, 33.02-47.58% HGO.

Host and associated rocks

  • Host or associated Associated
    Rock type Metamorphic Rock > Metasedimentary Rock > Quartzite
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Neoproterozoic
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Dolomite

Nearby scientific data

(1) -41.57533, -14.14491
ListMap

Economic information

Ore body information

  • Length 910M
    Width 810M
    Depth to bottom 165M

Economic information about the deposit and operations

Development status Prospect
Commodity type Both
Deposit size Medium
Significant No
Discovery year 1939
Discoverer Pierre Cahen And Georges Minvielle
Year of last production 1945

Mining district

District name Brumado, Serra Das Eguas

Ownership information

  • Type Owner-Operator
    Owner Magnesita Ltda. . Magnesita S. A. ).
    First year 1939
    Last year 1940

Comments on the production information

  • REPRESENT THE WHOLE DISTRICT. ACTIVE PROSPECT (1945).

Comments on the reserve resource information

  • MGS (1) MEASURED; MGS (2), INDICATED; MGS (3) INFERRED GIVEN IN TONS PER METER OF DEPTH. REPRESENTS WHOLE DISTRICT; (1) MEASURED RESERVES; (2) TOTAL RESERVE.

Reference information

Bibliographic references

  • Analytical Data

    BODENLOS (1954).

  • Deposit

    BODENLOS, A.J., 1954, MAGNESITE DEPOSITS IN SERRA DAS EGUAS, BRUMADO, BRAZIL: U.S. GEOLOGICAL SURVEY BULLETIN, 975-C, 87-170.

  • Deposit

    DE AZEVEDO BRANCO, P.C., 1984, PRINCIPAIS DEPOSITOS MINERAIS: CONCEITOS, METHODOLOGIA E LISTAGEM, CAPITULO IX IN C. SCHOBBENHAUS, D. DE ALMEIDA CAMPOS, G.R. DERZE, AND H.E. ASMUS, EDS., GEOLOGIA DO BRASIL: DEPARTAMENTO NACIONAL DA PRODUCAO MINERAL, P. 359-419.

  • Other Database

    CIMRI

  • Production

    DE AZEVEDO BRANCO (1984).

  • Reserve-Resource

    BODENLOS (1954). DE AZEVEDO BRANCO (1984).

Reporter information

Type Date Name Affiliation Comment
Reporter 01-AUG-1994 Page, Norman 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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