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  3. Mineral Resource Data System (MRDS)

Pedras Pretas

Past Producer in Bahia, Brazil 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. 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. Reserves and resources
  13. Links to other databases
  14. Bibliographic references
  15. Reporter information

Geologic information

Identification information

Deposit ID 10061768
MRDS ID TC34725
Record type Site
Current site name Pedras Pretas

Geographic coordinates

Geographic coordinates: -39.34891, -11.84778 (WGS84)
Relative position 262 KM NW OF SALVADOR.

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
Chromium Critical Primary

Materials information

Materials Type of material
Chromite Ore

Host and associated rocks

  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Harzburgite
    Stratigraphic age (youngest) Neoarchean

Nearby scientific data

(1) -39.34891, -11.84778
ListMap

Economic information

Ore body information

  • General form PODS, LENSES, LAYERS

Comments on the geologic information

  • COMPLEX OF ULTRAMAFIC ROCKS, GABBROS, AND ANORTHOSITES THAT WAS COMPLEXLY FOLDED, FAULTED, AND LATER INTRUDED BY GRANITIC ROCKS.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Significant No

Mining district

District name Santa Luz District

Comments on the production information

  • WWI PRODUCTION OVER 5 YEARS.

Reserves and resources

  • Type In-situ
    Estimate year 1986
    Total resources 269994000mt ore
    Commodity Subtype Grade units Group Importance Year
    Chromium Cr2O3 37.9 wt-pct Chromium Major 1986

Comments on the reserve resource information

  • ORE (1), TOTAL RESERVE; ORE (2), MEASURED FRIABLE ORE IN SECTOR A; ORE (3), MEASURED DISSEMINATED ORE IN SECTOR A; ORE (4), MEASURED MASSIVE ORE IN SECTOR A; ORE (5), INDICATED FRIABLE ORE IN SECTOR A; ORE (6), INDICATED DISSEMINATED ORE IN SECTOR A; ORE (7), INDICATED MASSIVE ORE IN SECTOR A; ORE (8), MEASURED FRIABLE ORE IN SECTOR B; ORE (9), MEASURED DISSEMINATED ORE IN SECTOR B; ORE (10), MEASURED MASSIVE ORE IN SECTOR B; ORE (11), MEASURED FRIABLE ORE IN SECTIOR C; ORE (12), MEASURED DISSEMINATED ORE IN SECTOR C; ORE (13), MEASURED MASSIVE ORE IN SECTOR C; ORE (14), INDICATED FRIABLE ORE IN SECTOR C; ORE (15), INDICATED DISSEMINATED ORE IN SECTOR IN SECTOR C; ORE (160, INDICATED MASSIVE ORE IN SECTOR C; ORE (17), ORE ESTIMATE FOR SECTOR D.

Comments on development

  • 85 DRILL HOLES TOTALING 5778 M, TO AT LEAST 120 M DEPTHS.

Reference information

Bibliographic references

  • Deposit

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

  • Deposit

    DE CARVALHO FILHO, A.R., DE QUEIROZ, E.T., AND LEAHY, G.A.S., 1986, JAZIDA DE CROMITA DE PEDRAS PRETAS, MUNICIPIO DE SANTA LUZ, BAHIA, IN PRINCIPAIS DEPOSITOS MINERAIS DO BRASIL, EDS., SCHOBBENHAUS, C., AND COELHO, C.E.S., V. II, P. 234-248.

  • Other Database

    CIMRI

  • Production

    CESAR (1984).; DE CARVALHO FILHO AND OTHERS (1986).,

  • Reserve-Resource

    CESAR (1984). DE CARVALHO FILHO AND OTHERS (1986).

Reporter information

Type Date Name Affiliation Comment
Reporter 01-AUG-1992 Page, Norman J. U.S. Geological Survey
Updater 01-MAR-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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