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Pedra Verde

Occurrence in Ceara, Brazil with commodities Copper, Silver
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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. Reserves and resources
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10060793
MRDS ID TC30229
Record type Site
Current site name Pedra Verde

Geographic coordinates

Geographic coordinates: -41.13229, -3.52321 (WGS84)
Elevation 175
Location accuracy 2000(meters)
Relative position 37 KM BY ROAD FROM VICOSA AND 395 KM FROM FONTALEZA, BEYOND SANDSTONE PLATEAU CALLED SERRA DE IPIABA. 7 KM NW OF VICOSA DO CEARA.

Site location context

Political divisions (FIPS codes)

Ceara(province)

Brazil(country)

South America(continent)

Land(continent)

Geographic areas

Country State
Brazil Ceara

Commodities

Commodity Importance
Copper Primary
Silver Primary

Materials information

Materials Type of material
Bornite Ore
Chalcocite Ore
Chalcopyrite Ore
Galena Ore
Malachite Ore
Pyrite Ore
Silver Ore
Sphalerite Ore
Tetrahedrite Ore
Specularite Gangue

Analytical data

Result 0.1-2.5% CU, UP TO 1000 G/MT AG, BUT IRREGULAR DISTRIBUTION.

Host and associated rocks

  • Host or associated Associated
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Sandstone
    Rock unit name Serra Grande Formation;Ubari Formation;;San Joaquim Formation;Mambira Formation
    Rock description Serra Grande Formation;Ubari Formation;;San Joaquim Formation;Mambira Formation
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Neoproterozoic
  • Host or associated Host
    Rock type Metamorphic Rock > Phyllite
    Rock unit name Pedra Member Of Mambira Formation
    Rock description Pedra Member Of Mambira Formation

Nearby scientific data

(1) -41.13229, -3.52321
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Ne Trending Graben Faults.

Ore body information

  • Strike N50E; NE-SW
    Dip 90; 45-50NW
    Thickness 11M
    Length 2900M
    Width 200M
    Depth to bottom 800M
  • Strike N50E; NE-SW
    Dip 90; 45-50NW

Comments on the geologic information

  • SANDSTONE IS ABOUT 100 M THICK, OVERLIES CONGLOMERATE CONSISITING OF ANGULAR FRAGMENTS OF MUDSTONE, SANDSTONE, PHYLLITE, QUARTZITE, AND QUARTZ PEBBLES WITH MALACHITE STAINS IN PEDRA VERDE GULCH. THESE UNITS OVERLIE A REGOLITH (7-16 M) THICK CONSISITING OF IRON OXIDES AND BOULDER OVERLYING ALTERED PHYLLITE (2-22 M) THICK. THE PRECAMBRIAN APPEARS TO BE AN UNCONFORMITY WITH THE CONGLOMERATE.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Significant No
Discovery year 1857

Comments on the production information

  • MINERACAO VICOSA S/A PLANNED TO PRODUCE BY UNDERGROUND MINING 5920 MT OF CU AND 5.73 MT OF AG BEGINING IN 1990.

Reserves and resources

  • Type In-situ
    Estimate year 1979
    Total resources 8200000mt ore
    Commodity Subtype Grade units Group Importance Year
    Copper Cu 0.8 wt-pct Copper Major 1979
  • Type In-situ
    Estimate year 1981
    Total resources 14016000000mt ore
    Commodity Subtype Grade units Group Importance Year
    Silver Ag 10 g/mt Silver Major 1981
    Copper Cu 0.98 wt-pct Copper Major 1981

Comments on the reserve resource information

  • MEASURED RESERVE; DRILL HOLES (COLLINS AND LOUREIRO, 1971) SHOW INTERSECTIONS OF 2-7 M OF 0.7-1.2% CU. ORE(1) TONNAGE BY CRIGGING WITH ERROR OF +/- 29% USING CUTOFF GRADE OF 0.06% CU, AND GETTING AN AVERAGE THICKNESS OF 3.15 +/- 0.91 M. BRIZZI AND ROBERTO (1988) GIVE OTHER RESERVE DATA AT VARIOUS CUTOFF GRADES. ORE (2) MEASURED RESERVE. ORE (3) INDICATED RESERVE.

Comments on the workings information

  • ADIT, CROSSCUTS OF 84 M (1947); ADIT NO. 2, 72 M; ADIT NO. 3, 15 M (1961).

Comments on development

  • ANTIGA GALERIA ADIT DRIVEN IN 1947; INDUSTRIA SUL AMERICANA DE METAIS S.A. (50% OWNED BY REVERE COPPER AND BRASS, INC.) 1961-1962 DID DIRECT EXPLORATION AND DRILLED 13 HOLES OF 1327 M.

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

    COLLINS, J.J., AND LOUREIRO, A.R., 1971, A METAMORPHOSED DEPOSIT OF PRECAMBRIAN SUPERGENE COPPER: ECONOMIC GEOLOGY, V. 66, NO. 1, P. 192-199.

  • Deposit

    BRIZZI, A.S., AND DA C. ROBERTO, F.A., 1988, JAZIDA DE COBRE DE PEDRA VERDE - VICOSA DO CEARA, CEARA, IN PRINCIPAIS DEPOSITOS MINERAIS DO BRASIL, EDS. C. SCHOBBENHAUS AND C.E.S. COELHO: MINISTERIO DAS MINAS E ENERGIA, BRASILIA, V. III, P. 71-80.

  • Deposit

    MINISTERIO DAS MINAS E ENERGIA (MME), 1981, PROJETO RADAMBRASIL; FOLHA SA 24 FORTALEZA; GEOLOGIA, GEOMORFOLOGIA, PEDOLOGIA, VEGETACAO E USO POTENCIAL DEL TERRA: MINISTERIO DAS MINAS E ENERGIA, RIO DE JANEIRO, 488P.

  • Other Database

    CIMRI

  • Reserve-Resource

    CESAR (1984); BRIZZI AND ROBERTO (1988); MME (1981)

General comments

Subject category Comment text
Deposit ORE ZONE LIES BELOW ALTERED PHYLLITE. MINERALIZATION RESTRICTED TO PHYLLITIC UNIT JUST BELOW A ZONE OF IRON-OXIDES BELOW CONGLOMERATE UNIT. AG MINERALIZATION OCCURS ON FOOTWALL OF CU MINERALIZATION.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-92 Norman J Page U.S. Geological Survey
Updater 01-FEB-94 Page, Norman J. U.S. Geological Survey
Updater 14-JUL-94 Page, Norman J. U.S. Geological Survey
Updater 03-JUL-95 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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