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Pedra Preta

Producer in Bahia, Brazil with commodities Magnesite, Talc-Soapstone
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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. Geologic structures
  10. Ore body information
  11. Economic information about the deposit and operations
  12. Mining district
  13. Ownership information
  14. Links to other databases
  15. Bibliographic references
  16. General comments
  17. Reporter information

Geologic information

Identification information

Deposit ID 10100880
MRDS ID TC40853
Record type Site
Current site name Pedra Preta

Geographic coordinates

Geographic coordinates: -41.28505, -14.13352 (WGS84)
Location accuracy 10000(meters)

Site location context

Political divisions (FIPS codes)

Bahia(province)

Brazil(country)

South America(continent)

Land(continent)

Geographic areas

Country State
Brazil Bahia

Comments on the location information

  • IN UPPER PART OF CORREGO DO JATOBA.

Commodities

Commodity Importance
Magnesite Primary
Talc-Soapstone 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 LEAST COMMON.

Materials information

Materials Type of material
Magnesite Ore
Talc Ore
Dolomite Gangue
Hematite Gangue
Quartz Gangue

Analytical data

Result MAGNESITE (34 SAMPLES): 0.74% CAO, 0.23% MNO
Result RED MAGNESITE (9 SAMPLES): 0.97% FE2O3, 0.88% AL2O3
Result WHITE MAGNESITE (8 SAMPLES): 0.61% FE2O3, 0.73% AL2O3
Result 36 SAMPLES 0.1-6.25% SIO2
Result 34.5-46.6% MGO.

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) -41.28505, -14.13352
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Large Syncline With Axis Striking N20e, Plunges Low. Angles To S.
Type of structure Local
Structure description On West Flank Of Syncline

Ore body information

  • General form LENTICULAR
    Length 1300M
    Width 550M
    Depth to bottom 155M

Economic information about the deposit and operations

Development status Producer
Commodity type Both
Deposit size Large
Significant No
Discovery year 1939
Discoverer Pierre Cahen And Georges Minvielle

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

  • IN 1945 TALC WAS MINED FROM ZONE 10 M WIDE OF FLOAT BLOCKS, SEVERAL HUNDRED TONS STOCKPILED; REPRESENTS THE WHOLE DISTRICT.

Comments on the reserve resource information

  • RESOURCES GIVEN IN TONS PER METER DEPTH. MGS (1) MEASURED; MGS (2) INDICATED; MGS (3) INFERRED FOR OUTCROP DEPTH OF 155 M. THIS AMOUNTS TO 45,570,000 TONS OF INDICATE ORE. REPRESENTS WHOLE DISTRICT; (1) MEASURED RESERVES; (2) TOTAL RESERVES.

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

    BODENLOS (1954); DE AZEVEDO BRANCO (1984)

  • Reserve-Resource

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

General comments

Subject category Comment text
Deposit SIZE GIVEN FOR OUTCROP VOLUME OF MAGNESITE TALC OCCURS IN VEIN.

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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