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Pedra Azul

Producer in Minas Gerais, Brazil with commodity Graphite
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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. Ownership information
  11. Production statistics
  12. Workings at the site
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10182254
MAS/MILS ID 3510230127
Record type Site
Current site name Pedra Azul
Alternate or previous names Fortaleza, Boqueirao De Salvacao

Geographic coordinates

Point of reference Ore Body
Geographic coordinates: -45.1323, -15.88094 (WGS84)
Location accuracy 10000(meters)

Site location context

Political divisions (FIPS codes)

Minas Gerais(province)

Brazil(country)

South America(continent)

Land(continent)

Geographic areas

Country State
Brazil Minas Gerais

Commodities

Commodity Importance
Graphite Critical Primary

Materials information

Materials Type of material
Graphite Unknown
Mica Unknown

Nearby scientific data

Ore Body (1) -45.1323, -15.88094
ListMap

Economic information

Ore body information

  • Field Value
    MAS Matrix # 1
    MAS Column # 1
    Type of Orebody #1 DISSEMINATED
    Shape of Orebody #1 TABULAR
    Primary mode of Origin METAMORPHISM
    Primary Ore Control BEDDING
    Secondary Ore Control LITHOLOGY
    Degree of Wallrock Alter. UNKNOWN
    Date of Last Modification 840703
  • Area 2000HA
    Field Value
    Total Surface Area (HA) 2000
    Date of Last Modification 910418

Economic information about the deposit and operations

Operation type Surface
Development status Producer
Commodity type Non-metallic
Significant Yes
Mining method Open Pit
Year of first production 1979
Milling method Flotation

Ownership information

  • Type Owner-Operator
    Owner Cia. Nacional De Grafite, Ltda
    Interest 100
    Home office Brazil
    Year 1983

Production statistics

  • Year 1979
    Description Ore=10% C, Product=93.3% C 70400 Mt Ore
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Graphite Graphite 70400mt 10wt-pct
  • Year 1980
    Description 128100 Mt Ore
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Graphite Graphite 128100mt
  • Year 1981
    Description 443200 Mt Ore
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Graphite Graphite 443200mt

Comments on the production information

  • PRODUCTION TONNAGES ARE ESTIMATED. THE 1981 TONNAGE INCLUDES 280,948 MT OF ORE THAT WERE STOCKPILED. IT IS PROPOSED THAT THIS STOCKPILED MATERIAL WILL BE MILLED IN 1984.

Comments on the reserve resource information

  • M1C1=M9C4. RESOURCES CALCULATED FROM 12/83 TONNAGE SUPPLIED BY COMPANY PLUS ESTIMATED 1982-83 PRODUCTION.
  • RECURSOS MINERAIS DO BRASIL, 1983. RESERVE TONNAGES IS UPDATED BY SUBTRACTING PROPOSED PRODUCTION TONNAGES UP TO DEC 1988.

Workings at the site

  • Type of workings Surface
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method ESTIMATE
    Mining Method OPEN PIT
    Swell Factor .6
    Percent Waste Rock 33.3
    Primary Material Cover SAND, GRAVEL
    Hardness of Ore HARDPAN
    Capacity 648
    Capacity Units MT ORE/DAY
    Unit Production Cost 23.4
    Units of Production $/MT ORE
    Operating Days per Year 260
    Operating Shifts per Day 1
    Year of Information 1983
  • Type of workings Surface
    Field Value
    MAS Development Schedule # 1
    Mining Record # 2
    Status of Mining Method ESTIMATE
    Mining Method OPEN PIT
    Swell Factor .6
    Percent Waste Rock 33.3
    Primary Material Cover SAND, GRAVEL
    Percentage 100
    Hardness of Ore HARDPAN
    Capacity 648
    Capacity Units MT ORE/DAY
    Unit Production Cost 19.35
    Units of Production $/MT ORE
    Operating Days per Year 260
    Operating Shifts per Day 1
    Year of Information 1983
  • Type of workings Surface
    Field Value
    MAS Development Schedule # 1
    Mining Record # 3
    Status of Mining Method ESTIMATE
    Mining Method OPEN PIT
    Swell Factor .6
    Percent Waste Rock 33.3
    Primary Material Cover SAND, GRAVEL
    Percentage 100
    Hardness of Ore HARDPAN
    Capacity 1728
    Capacity Units MT ORE/DAY
    Unit Production Cost 6.87
    Units of Production $/MT ORE
    Operating Days per Year 260
    Operating Shifts per Day 1
    Year of Information 1983
  • Type of workings Surface
    Field Value
    MAS Development Schedule # 1
    Mining Record # 4
    Status of Mining Method ESTIMATE
    Mining Method OPEN PIT
    Swell Factor .6
    Percent Waste Rock 33.3
    Primary Material Cover SAND, GRAVEL
    Percentage 100
    Hardness of Ore HARDPAN
    Capacity 1923
    Capacity Units MT ORE/DAY
    Unit Production Cost 14.67
    Units of Production $/MT ORE
    Operating Days per Year 260
    Operating Shifts per Day 1
    Year of Information 1983

Comments on other economic factors

  • REC. 1 - 168,537 MT ORE MILLED IN 1982 (34% OF CAPACITY). REC. 2 - 168,537 MT ORE MILLED IN 1983 (34% OF CAPACITY). MILL OP. COST DECREASES BECAUSE OF DECREASE IN LABOR COUPLED WITH INCREASE IN WORKER PRODUCTIVITY. REC. 3 - 449,485 MT ORE MILLED IN 1984 (90% OF CAPACITY). THIS TONNAGE INCLUDES 280,948 MT FROM STOCKPILE. THE MILL OP. COST FOR THIS YEAR (1984) IS ASSUMED TO BE THE SAME AS THE CALCULATED VALUE FOR 1985 BECAUSE THE 1984 PRODUCTION RATE IS VERY CLOSE TO FULL CAPACITY. REC. 4 - MILL ACHIEVES FULL CAPACITY OPERATION (500,000 MTPY). MILL OP. COST FOR 1984 AND 1985 DECREASES PRIMARILY BECAUSE OF ECONOMY OF SCALE, BUT ALSO REFLECTS INCREASE IN PRODUCTIVITY.
  • REC. 1 - MINE & MILL AT 34% OF CAPACITY. 168,537 MTPY ORE MINED AND MILLED. REC. 2 - MINE AND MILL OP. COSTS DECREASE BECAUSE LABOR FORCE DECRREASED AND WORKER PRODUCTIVITY INCREASED. REC. 3 - MINE STILL AT 34% OF CAPACITY (168,537 MTPY ORE). MILL AT 90% OF CAPACITY (449,485 MTPY FEED). THE EXTRA MILL FEED IS ORE THAT WAS MINED AND STOCKPILED IN 1981. THE MINE OP. COST IN 1984 REFLECTS THE COST OF RECLAIMING THE STOCKPILED ORE. REC. 4 - MINING AND MILLING BOTH ACHIEVE FULL CAPACITY IN 1985 (500,000 MTPY ORE).
  • REC. 1 - 168,537 MT ORE MINED IN 1982 (34% OF CAPACITY). REC. 2 - 168,537 MT ORE MINED IN 1983 (34% OF CAPACITY). MINE OP. COST DECREASES BECAUSE OF DECREASE IN LABOR COUPLED WITH INCREASE IN WORKER PRODUCTIVITY. REC. 3 - 168,537 MT ORE MINED IN 1984. 280,948 MT OF ORE RECLAIMED FROM ORE STOCKPILE. MINE OP. COST SHOWS DECREASE FOR SAME REASON AS IN 1982 AND ALSO DECREASES BECAUSE IT REFLECTS BOTH THE COST OF ACTUAL MINING DONE IN 1984 AND THE COST OF RECLAIMING THE STOCKPILED ORE. CAPACITY REFLECTS BOTH MINED AND STOCKPILED ORE. REC. 4 - MINE ACHIEVES FULL CAPACITY (500,000 MTPY) IN 1985. MINE OP. COST NO LONGER REFLECTS COST OF RECLAIMING STOCKPILED ORE. OP. COST CONTINUES TO REFLECT DECREASE IN LABOR AND INCREASE IN PRODUCTIVITY. VERY LITTLE DETAILED INFORMATION ABOUT THE MINING OPERATION IS AVAILABLE. THE ORE IS RIPPED BY TRACTORS, BUT ORE GATHERING IS MANUAL AND SELECTIVE. ASSUME 260 DPY OF OPERATION.

Reference information

Bibliographic references

  • Deposit

    GUIMARES, M.A., "PERFIL ANALITICO DE GRAFITA", DNPM, 1973.

  • Deposit

    ABREU, S.F., "RECURSOS MINERAIS DO BRASIL", 1963.

  • Deposit

    ANON., "SUMARIO MINERAL 1982", DEM/DNPM, 1982.

  • Deposit

    ANON., "ANUARIO MINERAL BRASILEIRO, 1982", DEM/DNPM, 1982.

  • Deposit

    TAYLOR, H.A., "USBM MINERALS YEARBOOK 1982", USBM, 1983.

  • Deposit

    ROBBINS, J., "GRAPHITE - DRAWING ON MIXED SOURCES", INDUS.

  • Deposit

    MIN., NO. 202, JULY 1984, P. 37-55.

General comments

Subject category Comment text
Deposit COST DATA FOR THIS PROPERTY WERE GATHERED UNDER BUREAU OF MINES CONTRACT J0225019, "THE DEVELOPMENT OF ENGINEERING AND COST DATA FOR FOREIGN GRAPHITE PROPERTIES"; THE CONTRACT WAS AWARDED TO ZELLARS-WILLIAMS, INC. IN SEPTEMBER 1982. THE MINE IS LOCATED APPROXIMATELY 700 KM EAST OF BRASILIA, THE CAPITAL OF BRAZIL, IN THE NORTHEAST PORTION OF THE STATE OF MINAS GERAIS. THE DIMENSIONS OF THE OREBODY ARE NOT KNOWN.

Reporter information

Type Date Name Affiliation Comment
Reporter 18-APR-1995 Z&W Inc 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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