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  3. Mineral Resource Data System (MRDS)

Igarape Bahia

Prospect in Para, Brazil with commodities Gold, Silver, Copper
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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. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10065448
MRDS ID TC40691
Record type Site
Current site name Igarape Bahia

Geographic coordinates

Geographic coordinates: -50.5497, -6.03059 (WGS84)
Elevation 600
Location accuracy 2000(meters)

Site location context

Political divisions (FIPS codes)

Para(province)

Brazil(country)

South America(continent)

Land(continent)

Geographic areas

Country State
Brazil Para

Comments on the location information

  • NEAR ITSMINA
  • PREVIOUS QUAD DESIGNATION = SERRA DOS CARAJAS 1:250000

Commodities

Commodity Importance
Gold Primary
Silver Secondary
Copper Secondary

Comments on the commodity information

  • MOST AU GRAINS LESS THAN 10 MICRONS; AG VARIES FROM 0-21.37 WEIGHT % OF GOLD.

Materials information

Materials Type of material
Bornite Ore
Chalcopyrite Ore
Electrum Ore
Gold Ore

Analytical data

Result GOLD GRAINS HAVE UP TO 0.41 WEIGHT % CU, 1.04 WEIGHT % HG, UP TO 0.08 WEIGHT % PT, AND UP TO 0.07 WEIGHT % PD.

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Schist
    Rock unit name Rio Fresco Group
    Rock description Rio Fresco Group
    Stratigraphic age (youngest) Early Cretaceous
    Stratigraphic age (youngest) Early Cretaceous

Nearby scientific data

(1) -50.5497, -6.03059
ListMap

Economic information

Ore body information

  • Length 2800M
    Width 260M

Comments on the geologic information

  • LATERITE PROFILE DIVIDED INTO (1) UNWEATHERED BEDROCK, (2) SAPROLITE ZONE, (3) PALLID ZONE, (4) MOTTLED ZONE, (5) FERRUGINOUS ZONE, AND (6) TOPSOIL. SAPROLITE UP TO0 M THICK CONSIST OF KAOLINITE AND CLAYS WITH RELICT QUARTZ, CHLORITE, MAGNETITE, ILMENITE, RUTILE, APATITE, ZIRCON, AND LOCALLY COLLOFORM GOETHITE WITH PRESERVED ROCK TEXTURES. PALLID ZONE UP TO 20 M THICK, COMPOSED OF OFF-WHITE KAOLINITE WITH RELICT QUARTZ, ILMENITE, AND GOETHITE. MOTTLED ZONE UP TO 100 M THICK CONSISTS OF YELLOW TO BROWN KAOLINITIC CLAYS WITH BLOCK TEXTURES WITH IRON-RICH CLAY LUMPS AND STAINS; QUARTZ, GOETHITE, HEMATITE, ILMENITE, AND GIBBSITE ARE OTHER MINERALS. FERRUGINOUS ZONE IS UP TO 25 M THICK AND CONTAINS IRON-OXIDE NODULES, PISOLITES, FERRUGINOUS SOIL, RELICT QUARTZ VEINS, AND TEXTURES SUGGESTING BRECCIAS. IT CONTAINS MAGHEMITE, CRYPTOMELANE-HOLLANDITE, GIBBSITE, RELICT QUARTZ VEINS AND TOURMALINE. DEVELOPED OVER CU-AU BEARING BRECCIA PIPE.

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic
Significant No

Mining district

District name Serra Dos Carajas

Comments on the production information

  • ACTIVE LITTLE DEVELOPED PRODUCER

Comments on the reserve resource information

  • AU CONTAINED METAL IN ORE.

Comments on development

  • AT LEAST 2 DRILL HOLES AND TRENCHES.

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit 2 AREAS AU-BEARING LATERITE. FERUGINOUS ZONE CONTAINS 0.152 TO 6.836 PPM AU, 1.4 TO 141.7 PPM AG IN WHOLE ROCK; MOTTLED ZONE 0.084 TO 1.891 PPM AU, 1.2-3.6 PPM AG; PALLID ZONE 0.007-0.038 PPM AU, 0.7-2.5 PPM AG; SAPROLITE 0.003-0.211 PPM AU, 1.7-6.0 PPM AG. LENGTH IS AGGREGATED LENGTH OF 2 AREAS; WIDTH IS MAXIMUM WIDTH.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAR-1994 Page, Norman J. U.S. Geological Survey
Updater 11-APR-1995 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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