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Juca Vieira

Past Producer in Minas Gerais, Brazil with commodity Gold
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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. Alteration
  8. Host and associated rocks
  9. Nearby scientific data
  10. Ore body information
  11. Economic information about the deposit and operations
  12. Mining district
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10064792
MRDS ID TC39289
Record type Site
Current site name Juca Vieira

Geographic coordinates

Geographic coordinates: -43.66756, -19.91832 (WGS84)
Location accuracy 1000(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

Comments on the location information

  • LATITUDE AND LONGITUDE FOR FIELD ON ALLUVIAL FAN BELOW ALKALI SPRINGS; AGATES FOUND WITHIN A BROAD AREA ON ALLUVIAL FANS AND SLOPES ALONG THE EAST SIDE OF THE BLACK MOUNTAIN RANGE AND NOT RESTRICTED TO THE 1:24,000 QUADRANGLES NOTED.; PREVIOUS QUAD DESIGNATION = MOUNT NUTT 1:24000
  • NEAR TOWN OF JUCA VIEIRA, PICKED MINE SYMBOL FOR LOCATION ALTHOUGH ADITS ARE ABOUT 1/4 TO 1/2 KM SW OF SYMBOL

Commodities

Commodity Importance
Gold Primary

Comments on the commodity information

  • ALL COLORS INCLUDING RARE BLACK FIRE AGATE AS WELL AS PLAIN CHALCEDONY

Materials information

Materials Type of material
Gold Ore
Quartz Gangue

Alteration

  • (Local) Sericitization, Carbonation, Chloritization (Inner To Outer Zones)

Host and associated rocks

  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Mafic Volcanic Rock
    Rock unit name Nova Lima Group
    Rock description Nova Lima Group
    Stratigraphic age (youngest) Neoarchean
    Stratigraphic age (youngest) Neoarchean

Nearby scientific data

(1) -43.66756, -19.91832
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Economic information

Ore body information

  • Name JUCA VIEIRA

Comments on the geologic information

  • BEDROCK SOURCES OF AGATES ARE IN BLACK MOUNTAINS WHICH ARE PREDOMINANTLY QUATERNARY BASALTS (LATE TO MIDDLE MIOCENE) BUT ALSO INCLUDE TERTIARY VOLCANIC ROCKS AND MAY INCLUDE SILICIA TO MAFIC FLOWS, PYROCASTIC ROCKS, AND SOME SUBVOLCANIC INTRUSIONS.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No

Mining district

District name Caete District

Comments on the workings information

  • ABOUT 12 ADITS IN THE AREA

Comments on development

  • NO POWER EQUIPMENT OR EXPLOSIVES ALLOWED IN FEE AREA; COLLECTION REQUIRES EFFORT AND LUCK. EQUIPMENT SHOULD INCLUDE ROCK PICK, SHOVEL, SMALL SCREW DRIVER, WHISK BROOM, SLEDGE HAMMER, 3-4 FT PRY BAR, SPRAY BOTTLE WITH WATER, SMALL CHISELS AND BUCKET ORE BAG. BEST HUNTING IN FALL PARTICULARLY IF SUMMER STORMS HAVE EITHER DISTURBED OR ADDED NEW MATERIAL TO THE FIELD; BEST TIME OF DAY TO SEE AGATE IS JUST AFTER SUN RISE OR BEFORE SUNSET. ; ECON.COM: PART OF THIS FIELD IS A FEE AREA: AS OF 1989, ONE AREA REQUIRES A FEE ($5.00) AND WAIVER SIGNED PRIOR TO VISITATION; CONTACT MRS. ALMA SNYDER, OSR, BOX 905, KINGMAN, AZ 86401; NO LIMIT ON AMOUNT OF MATERIAL COLLECTED.

Reference information

Bibliographic references

  • Deposit

    VIEIRA, F.W.R., AND OLIVEIRA, G.A.I. DE, 1988, GEOLOGIA DO DISTRITO AURIFERO DE NOVA LIMA, MINAS GERAIS: PRINCIPAIS DEPOSITAS MINERAIS DO BRASIL, C. SCHOBBENHAUS AND C.E.S. COELHO, EDS., P. 378-391.

  • Deposit

    VIEIRA, F.W.R., 1991, TEXTURES AND PROCESSES OF HYDROTHERMAL ALTERATION AND MINERALIZATION IN THE NOVA LIMA GROUP, MINAS GERAIS, BRAZIL, IN BRAZIL GOLD '91, E.A. LADEIRA, ED.: BALKEMA, ROTTERDAM, P. 319-325.

  • Other Database

    CIMRI

General comments

Subject category Comment text
Deposit DO NOT ASSUME THAT THIS RECORD GIVES PERMISSION TO COLLECT IN THE AREA DESCRIBED HERE. LAND STATUS CAN CHANGE AND COLLECTORS NEED TO CHECK LOCALLY OR WITH THE COUNTY RECORDERS OFFICE.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-OCT-1993 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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