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Golconda

Producer in Minas Gerais, Brazil with commodities Mica, Niobium (Columbium), Tantalum, 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. Host and associated rocks
  8. Nearby scientific data
  9. Geologic structures
  10. Ore body information
  11. Economic information about the deposit and operations
  12. Ownership information
  13. Links to other databases
  14. Bibliographic references
  15. Reporter information

Geologic information

Identification information

Deposit ID 10066333
MRDS ID TC42488
Record type Site
Current site name Golconda

Geographic coordinates

Geographic coordinates: -41.71253, -18.42114 (WGS84)
Elevation 500
Location accuracy 10000(meters)
Relative position 2 KM N OF NHA NHA.

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

  • SOUTH SLOPE OF MORRO DA ONCA A SPUR OF SERRA DAS ESCADINHAS.

Commodities

Commodity Importance
Mica Primary
Niobium (Columbium) Critical Primary
Tantalum Critical Primary
Gemstone Primary

Materials information

Materials Type of material
Aquamarine Ore
Muscovite Ore
Tantalite Ore
Amblygonite Gangue
Biotite Gangue
Cassiterite Gangue
Cleavelandite Gangue
Feldspar Gangue
Lepidolite Gangue
Phenacite Gangue
Quartz Gangue
Tourmaline Gangue

Host and associated rocks

  • Host or associated Associated
    Rock type Metamorphic Rock > Schist > Amphibole Schist
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Neoproterozoic
  • Host or associated Host
    Rock type Plutonic Rock > Pegmatite

Nearby scientific data

(1) -41.71253, -18.42114
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Asymmetric And Overturned To West Isoclinal Antiform With N25w, 60ne Axial Plane And N10 Plinge Of The Axis.

Ore body information

  • General form SILL-LIKE WITH CURVED, IRREGULAR CONTACTS
    Strike E-W
    Dip 10-30N
    Thickness 6M
    Length 200M
    Width 150M

Comments on the geologic information

  • MICA SHOOTS IN INTERMEDIATE ZONE.

Economic information about the deposit and operations

Development status Producer
Commodity type Both
Significant No
Year of first production 1908

Ownership information

  • Type Operator
    Owner Santos Nogueria Co.
    First year 1942
  • Type Owner
    Owner Maria Theresa Becker
    First year 1935
    Last year 1942

Comments on the production information

  • 1945 REPRESENTS 6 MONTHS; 1944, 11 MONTHS. STRIPPING RATIO 5.7:1 OVERBURDEN TO PEGMATITE; UNDERGROUND (JAN.-SEPT. 1945) MOVED 450 CUBIC METERS TO PRODUCE 70 MT OF CRUDE MICA WITH NET OF DRIFTS AND CROSS-CUTS.

Comments on the reserve resource information

  • INDICATED RESERVE IN AREA E AND W OF MAIN ADIT; ORE (1) MEASURED AND INDICATED RESERVES.

Comments on the workings information

  • TERRACED OPEN CUT, WIDTH 10-75 M, UP TO 30 M DEEP, REMOVED 200,000 CUBIC METERS; ADITS AND INCLINE.

Reference information

Bibliographic references

  • Deposit

    PECORA, W.T., KLEPPER, M.R., LARRABEE, D.M., BARBOSA, A.L.M., AND FRAYHA, RESK, 1950, MICA DEPOSITS IN MINAS GERAIS, BRAZIL: U.S. GEOLOGICAL SURVEY BULLETIN 964-C, P. 205-305.

  • Deposit

    PECORA, W.T., AND BARBOSA, A.L.M., 1944, THE GOLCONDA PEGMATITE MINE, MUNICIPIO OF GOVERNADOR VALADARES, MINAS GERAIS, BRAZIL: U.S. GEOLOGICAL SURVEY UNPUBLISHED REPORT 14P.

  • Other Database

    CIMRI

  • Production

    PECORA AND BARBOSA (1944); PECORA AND BARBOSA (1944), PECORA ET AL (1950).

Reporter information

Type Date Name Affiliation Comment
Reporter 01-DEC-1994 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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