Barra Verde

Producer in Rio Grande Do Norte, Brazil with commodities Molybdenum, Tungsten
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. Ownership information
  12. Production statistics
  13. Reserves and resources
  14. Workings at the site
  15. Links to other databases
  16. Bibliographic references
  17. General comments
  18. Reporter information

Geologic information

Identification information

Deposit ID 10232553
MAS/MILS ID 3510350002
Record type Site
Current site name Barra Verde

Geographic coordinates

Point of reference Ore Body
Geographic coordinates: -36.49888, -6.16476 (WGS84)
Elevation 350

Site location context

Political divisions (FIPS codes)

Rio Grande Do Norte(province)

Brazil(country)

South America(continent)

Land(continent)

Geographic areas

Country State
Brazil Rio Grande Do Norte

Commodities

Commodity Importance
Molybdenum Tertiary
Tungsten Critical Primary

Materials information

Materials Type of material
Epidote Unknown
Garnet Unknown
Hornblende Unknown
Scheelite Unknown
Vesuvianite Unknown

Nearby scientific data

Ore Body (1) -36.49888, -6.16476

Economic information

Ore body information

  • Strike N10E
    Dip 12S
    Thickness 20M
    Length 500M
    Width 100M
    Depth to top 150M
    Field Value
    Type of Orebody #1 REPLACEMENT
    Shape of Orebody #1 LENTICULAR
    Type of Orebody #2 DISSEMINATED
    Primary mode of Origin CONT METASOMATIC
    Primary Ore Control CONTACT ZONE
    Secondary Ore Control LITHOLOGY
    Degree of Wallrock Alter. INTENSE
    Strike And Dip N10E:12S
    Minimum Depth to Top 0
    Avg. Thick. Unconsol. Mat. 1
    Min. Thick. Unconsol. Mat. 0
    Date of Last Modification 830909

Comments on the geologic information

  • ORE ZONE IS COMPRISED OF 2 MARBLE BEDS AVERAGING 20M IN THICKNESS. ORE BODY IS FORMED BY 6 CALCAREOUS BEDS; AVERAGE THICKNESS OF BEDS IS 3M EACH.

Economic information about the deposit and operations

Operation type Underground
Development status Producer
Commodity type Metallic
Significant Yes
Discovery year 1943
Mining method Open Stope - Room and Pillar
Year of first production 1955
Milling method Gravity

Mining district

District name Currais Novos

Ownership information

  • Type Owner
    Owner Mineracao Sertaneja Ltda.
    Interest 100
    Home office Brazil
    Year 1981
  • Type Operator
    Owner Mineracao Acauan Industria E Comercio S. A.
    Interest 100
    Home office Brazil
    Year 1981

Production statistics

  • Year 1981
    Description 194000 Mt Ore/Year

Reserves and resources

  • Type In-situ
    Estimate year 0
    Measured 300000mt ore
    Demonstrated 300000mt ore
    Total resources 300000mt ore
    Commodity Subtype Grade units Group Importance Year
    Tungsten Wo3 1 wt-pct Tungsten Major 0
    Molybdenum Mo 0.1399 wt-pct Molybdenum Trace 0

Comments on the reserve resource information

  • RESOURCES AS OF 1/83.

Workings at the site

  • Type of workings Underground
    Length 4000M
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method ESTIMATE
    Mining Method ROOM AND PILLAR 10-34
    Percent Recovery 85
    Hardness of Rock HARDROCK FISSURED WITH MODERATE WATER
    Rock Characteristics ONE SYSTEM OF WEAKNESS PLANES
    Rock Support Chars. SUPPORTING
    Mine Support Chars. TIMBER
    Number of Shafts 3
    1st Condition of Workings OPEN
    Capacity 650
    Capacity Units MT ORE/DAY
    Unit Production Cost 11.7
    Units of Production $/MT ORE
    Operating Days per Year 300
    Operating Shifts per Day 3
    Year of Information 1981

Reference information

Bibliographic references

  • Deposit

    BARBOSA, F.L.M., 1973, THE ECONOMIC POTENTIAL OF TUNGSTEN IN

  • Deposit

    BRAZIL, IN INTERNATIONAL ECONOMIES OF MINERALS AND FUELS

  • Deposit

    SCHOOL OF MINES QUART., V.68, NO.4, PP. 115-162.

  • Deposit

    EBERT, HEINZ, 1970. THE PREAMBRIAN GEOLOGY OF THE "BORBOREMA

  • Deposit

    (STATES OF PARAIBA AND RIO GRANDE DE NORTE, N.E. BRAZIL)

  • Deposit

    THE ORIGIN OF ITS MINERAL PROVINCES: GEOL. RUNDSCH., V.5

  • Deposit

    P.P 1292-1326.

  • Deposit

    JOHNSTON, W.D., AND DE VASCONCELLOS, F.M., 1945, SCHEELITE I

  • Deposit

    BRAZIL: ECON. GEOL., V.40:1, PP. 34-50.

  • Deposit

    VASCONCELLOS, F.M. DE, 1964, INSPECCAO A MINA DE SCHEELITA B

  • Deposit

    ENG. MIN. MET., V. XL, NO.280, PP. 229-232.

  • Deposit

    LEFOND, S.J., 1973, BRAZILIAN MINING: RELAXED GOVT ATTITUDE

  • Deposit

    THE WAY FOR EXPLOITING CRITICAL RESERVES: MIN. ENG., V.2

  • Deposit

    NO. 11, PP. 31-45.

  • Deposit

    BARBOSA, F.L.M., 1973, PERFIL ANALITICO DO TUNGSTENIO: ONPM

  • Deposit

    NO. 24, RIO DE JANEIRO, 69 P.

  • Deposit

    LOBO, G., TUNGSTEN BRAZIL, A REPORT TO DAVY MCKEE, SAO PAULO

  • Deposit

    BRAZIL, NOV., 1981.

  • Deposit

    YIN, S.W.H., AND WANG, C.T., TUNGSTEN: SOURCES, METALLURGY,

  • Deposit

    PROPERTIES, AND APPLICATIONS, PLENUM PRESS, NEW YORK.

  • Deposit

    ROSKILL INFORMATION SERVICES LTD., THE ECONOMICS OF TUNGSTEN

  • Deposit

    6'TH EDITION 1990. P 55.

General comments

Subject category Comment text
Deposit 75-RCD 020 OWNER/OPER IS SUB OF BRASIMET INDUSTRIA E COMERCI 75-RCD 080 ORE BODY IS CONTINUATION OF BREJUI 935135001 OVER 75-RCD 050 OPERATED INTERMITTENTLY. CONTINUOUS SNCE 1969 75-RCD 080 LODES PLUNGE 15S IN DESCRIBED ZONE 75-RCD 120 OTHER MINING METHOD-COMB SHRINKAGE-OPEN STOPE 75-RCD 151 COSTS AND PRODUCTION EST FROM BARBOSA, 1973A 75-RCD-102-.14 PCT. MOLYBDENUM ISNOT RECOVERED PRESENTLY. 1956-1963 WAH CHANG CORPORATION LEASED THE PROPERTY AND COMMENCED OPERATION IN 1956. PRODUCTION DURING THIS PERIOD AMOUNTED TO 4624 MT CONCENTRATES. 1970-1975 MINERACAO SERTANEJA SECURED THE PROPERTY AND BEGAN OPERATIONS WITH INSTALLATION OF A GRAVITY MILL. PRODUCTION FOR THIS PERIOD, 3600 MT; TOTAL PRODUCTION TO 1975, 8224 MT WITH AN AVERAGE WO3 CONTENT OF 75%. 1975-1977 CURRENT RATE OF PRODUCTION IS 400 MTPD OF AS-MINED ORE.(FOR COMMENTS 010-019 SEE YIH AND WANG). THE BARRA VERDE DEPOSIT PRODUCED OVER 700 TONNES OF CONCENTRATES GRADING OVER 74% WO3 IN 1981 AND 1982, BUT PRODUCTION FELL TO 524 TONNES IN 1983 AND 559 TONNES IN 1984. IN 1979 THE GRADE OF CONCENTRATE PRODUCED EXCEEDED 77% WO3. (SEE ROSKILL IN BIBLIOGRAPHY).

Reporter information

Type Date Name Affiliation Comment
Reporter 27-FEB-1984 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.