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Fazenda Sitio De Coirana Amethyst

Producer in Bahia, Brazil with commodity Gemstone
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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. Economic information about the deposit and operations
  9. Links to other databases
  10. Bibliographic references
  11. General comments
  12. Reporter information

Geologic information

Identification information

Deposit ID 10069083
MRDS ID W002385
Record type Site
Current site name Fazenda Sitio De Coirana Amethyst

Geographic coordinates

Geographic coordinates: -42.46563, -14.29769 (WGS84)

Site location context

Political divisions (FIPS codes)

Bahia(province)

Brazil(country)

South America(continent)

Land(continent)

Geographic areas

Country State
Brazil Bahia

Comments on the location information

  • 7 1/2 MINUTE QUADS AVAILABLE-CUSTER AND SUNBEAM, IDAHO

Commodities

Commodity Importance
Gemstone Primary

Materials information

Materials Type of material
Amethyst Ore

Nearby scientific data

(1) -42.46563, -14.29769
ListMap

Economic information

Comments on the geologic information

  • PERMIAN CASTO VOLCANICS, ALTERED ANDESITIC-RHYOLITIC FLOW & TUFFS. JURASSIC IDAHO BATHOLITH, QUARTZ MONZONITE. PENN. WOOD RIVER FM., DARK GRAY MASSIVE QUARTZITE. OLIGO-MIO CHALLIS VOLCANICS, LATITE-ANDESITE FLOWS, BEDDED TUFFS. MIOCENE DACITE PORPHYRY, GRANOPHYRE, QUARTZ MONZONITE DIKES.

Economic information about the deposit and operations

Development status Producer
Commodity type Non-metallic
Significant No

Comments on the production information

  • $13,000,000 TOTAL; GENERAL CUSTER MINE-$8,000,000; LUCKY BOY-$2,200,000 GRADE RANGES FROM $150 TO $300/TON, DROPPED TO $30/TON

Comments on the workings information

  • DESCRIPTION IS OF GENERAL CUSTER MINE, THE MAIN PRODUCER. OTHER DEPOSITS HAD SOME BEDDING REPLACEMENT. LUCKY BAY MINE HAD 10,500 FT OF UNDERGROUND WORKINGS TO A DEPTH OF 900 FT.

Reference information

Bibliographic references

  • Deposit

    MONTHLY REPORT, BRAZIL PROJECT, MARCH 1969, HEDLUND, D.C

  • Other Database

    CIMRI

General comments

Subject category Comment text
Deposit MOST MINERALIZATION IS IN ALTERED CHALLIS VOLCANICS ALONG FRACTURE ZONES TRENDING N 70 DEG E ON THE EAST FLANK OF THE BROAD ANTICLINE IN THE CHALLIS VOLCANICS
Deposit QUARTZ VEIN AND GRAVEL LENSES
Deposit AMETHYST QUARTZ IS BEING MINED FROM LATERITIC SOIL 4 TO 5 KM S.E. OF BREJINHO DAS AMETISTAS. THREE OCCURENCES IN THIS AREA ARE KNOWN, FAZENDAS SITIO DE COIRANA, SITIO VAI QUEM PODE, AND SAN MANOEL VIZENTO. THE WORKINGS ARE SMALL TUNNELS INTO CLIFFS OF LATERITE. GRAVEL LENSES WITH ROUNDED VEIN QUARTZ IN THE LATERITIC SOIL CONTAIN THE AMETHYST. THE SOIL IS AS MUCH AS 10 M THICK AND IS DERIVED FROM THE WEATHERING OF QUARTZITIC SANDSTONE DETRITUS OF THE SERRA CHAPADA DIAMANTINA. THE QUARTZITES OF THE SERRA ARE CUT BY NUMEROUS QUARTZ VEINS SOME OF WHICH CONTAIN AMETHYST. THE VEIN QUARTZ IS RESISTANT TO WEATHERING, WHEREAS THE QUARTZITE WEATHERS TO A FRIABLE SAND, AND DURING TRANSPORT THE VEIN QUARTZ COBBLES ARE CONCENTRATED IN LENSES WITHIN THE SANDY DETRITUS.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAY-1974 Warfle, Thomas M. U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

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