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Pedrinhas/Cascabulhos

Plant 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. Nearby scientific data
  8. Ore body information
  9. Economic information about the deposit and operations
  10. Mining district
  11. Mineral rights holdings
  12. Land status
  13. Ownership information
  14. Production statistics
  15. Workings at the site
  16. Links to other databases
  17. Bibliographic references
  18. General comments
  19. Reporter information

Geologic information

Identification information

Deposit ID 10231108
MAS/MILS ID 3510090011
Record type Site
Current site name Pedrinhas/Cascabulhos
Alternate or previous names Pedrinhas Campo Formoso

Geographic coordinates

Point of reference Ore Body
Geographic coordinates: -40.29893, -10.58114 (WGS84)
Elevation 500
Location accuracy 1000(meters)

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 Unknown
Serpentine Unknown

Nearby scientific data

Ore Body (1) -40.29893, -10.58114
ListMap

Economic information

Ore body information

  • Strike N10E
    Dip 55E
    Thickness 5M
    Length 5500M
    Width 61M
    Depth to top 25M
    Field Value
    MAS Matrix # 1
    MAS Column # 3
    Type of Orebody #1 OTHER
    Shape of Orebody #1 TABULAR
    Primary mode of Origin MAGMATIC DIFFER
    Primary Ore Control FAULTING
    Secondary Ore Control LITHOLOGY
    Degree of Wallrock Alter. SLIGHT
    Type of Wallrock Alter. #1 OTHER
    Strike And Dip N10E:55E
    Minimum Depth to Top 0
    Avg. Thick. Unconsol. Mat. 4
    Min. Thick. Unconsol. Mat. 0
    Date of Last Modification 830718
  • Area 2000HA
    Field Value
    Total Surface Area (HA) 2000
    Date of Last Modification 910418

Economic information about the deposit and operations

Operation type Underground
Development status Plant
Commodity type Metallic
Significant Yes
Discovery year 1914
Mining method Filled Stopes
Year of first production 1965
Plant type Beneficiation (Mill)
Milling method Gravity

Mining district

District name Campo Formoso District

Mineral rights holdings

Type of mineral rights Private Lease

Land status

Ownership category Private

Ownership information

  • Type Owner-Operator
    Owner Cia. De Ferroligas Da Bahia Sa (Ferbasa)
    Interest 100
    Home office Brazil
    Year 1981
    First year 1981

Production statistics

  • Year 1980
    Description Chromite Output; Conc. Out-29.75%, Input Was 14.3% 400000 Mt Ore/Yr
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Conc. Chromium Chromium 400000mt 30wt-pct

Comments on the production information

  • PA=LUMP AND GRAINS, PB=CR2O3 CONCENTRATE. PORTIONS OF PRODUCTION ARE ESTIMATES.

Comments on the reserve resource information

  • IN 1985 MINING OPER. SHUTDOWN IN PREPARATION FOR CONVERSION FROM SURFACE MINING TO UNDERGROUND MINING. INDICATIONS AS OF 1989 THAT CONVERSION MAY NOT HAVE BEEN MADE. 400,000 MTPY ROM AT 21.0 %CR2O3 FOR: 90,000 MTPY LUMP&GRAINS AT 35.0 %CR2O3 AND 90,000 MTPY CONCS. AT 41.5 %CR2O3. ALL PRODUCTS FOR USE AT POJUCA SMELTER.
  • M1C3 = M9C4. RESOURCE TONNAGES ARE ESTIMATES OF THE AMOUNT OF ORE THAT SHOULD BE MINABLE BY OPEN PIT METHODS TO VERTICAL DEPTHS OF 50 M. THE 13000000 TONS REPRESENT A COMBINATION OF TWO SEPARATE DEPOSITS- 4290 TONS IN THE CASCABULHOS TREND AND 8710 TONS IN THE PEDRINHAS TREND. QMATRIX 9 COLUMN 1: ADIT RESOURCES AS OF JAN 1989.
  • IN-SITU TONNAGE AS OF 1/89 = 15,292,000 MT AT 21.0 %CR2O3, ALL OF IT ANALYZED FOR UNDERGROUND EXTRACTION WITH 80 % RECOVERY.

Workings at the site

  • Type of workings Surface
    Area 2000HA
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method ACTUAL
    Mining Method BENCH (BERM)
    Percent Waste Rock 87
    Avg. Overburden Thickness 8
    Primary Material Cover SAND, GRAVEL
    Hardness of Ore M-HARD ROCKS
    Avg. Bench Height (meters) 10
    Max. Pit Slope (degrees) 38
    Capacity 1333
    Capacity Units MT ORE/DAY
    Unit Production Cost 12.99
    Units of Production $/MT ORE
    Operating Days per Year 300
    Operating Shifts per Day 2
    Year of Information 1981

Comments on other economic factors

  • THE DATA GIVEN IN THIS REPORT IS AN AVERAGE BETWEEN THE TWO MINES THAT MAKE UP THE PENDRINHAS PROPERTY:PEDRINHAS TREND AND THE CASCABULHOS TREND. HOWEVER THERE ARE TWO GEOMETRY RECORDS TO REPRESENT THE SIGNIFICANT DIFFERENCES IN THE ORE BODY.

Reference information

Bibliographic references

  • Deposit

    JULY 31, 1975: BACELLAR, G.A., AND NUHES LEAL, G.R., 19 73,

  • Deposit

    ANALITICO DA CROMITA [CHROMITE ANALITICAL PROFILE]: D.N.P.M.

  • Deposit

    MIN. ENER., BOL., NO. 10, 55 P.

  • Deposit

    ALVES DE SOVZA, H.C., 1942, CROMO NA BAHIA [ CHROMIUM IN BAH

  • Deposit

    N.P.M., MIN. AGRI., D.F.P.M., BOL. NO. 54, 110 P.

  • Deposit

    HEDLUND,D.,ET AL."STRATIFORM CHROMITE AT CAMPO FORMOSO,BAHIA

  • Deposit

    ,BRASIL."JOURNAL OF RESEARCH OF THE THE UNITED STATES

  • Deposit

    GEOLOGICAL SERVICE. VOL.2,NO.5. 1974. PP551-562

  • Deposit

    ROSKILL INFORMATION SERVICE LTD."THE ECONOMICS OF CHROMIUM."

  • Deposit

    3RD EDITION.LONDON.PP 54-62

  • Deposit

    THE TEX REPORT."CHROME MINES IN BRASIL." 1978. PP.114-118.

  • Deposit

    PERSONAL COMMUNICATION, PRIVATE CONSULTANT IN BRAZIL, 1981.

General comments

Subject category Comment text
Deposit DATA ON THE GEOMETRY REFERS TO THE PEDRINHAS TREND. TOTAL RESOURCES INCLUDE ORE MINED FROM THE CASCABULHAS TREND ALSO. DIMENSIONS FOR THIS TREND ARE: 2500 M LONG, 106 M WIDE, AND 4.8 M THICK. THE TREND STRIKES EAST-WEST AND DIPS 28 DEGREES SOUTH.

Reporter information

Type Date Name Affiliation Comment
Reporter 29-AUG-1995 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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