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Urubu

Past Producer in Minas Gerais, Brazil with commodities Gold, 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. Ore body information
  10. Economic information about the deposit and operations
  11. Mining district
  12. Ownership information
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10064788
MRDS ID TC39284
Record type Site
Current site name Urubu

Geographic coordinates

Geographic coordinates: -43.81228, -20.03999 (WGS84)
Location accuracy 1000(meters)
Relative position 700 M E OF SANTA RITA

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

  • LOCATION OF LATITUDE/LONGITUDE IS AT THE CENTER OF THE TRIANGLE BASIN WHICH IS ABOUT 4 SQUARE MILES IN AREA AND DRAINED BY THE AGNES RIVER, TIN MINE RIVER, AND OTHER EASTERN TRIBUTARIES OF THE FRANKLIN RIVER; THE AGNES RIVER IS SURROUND BY BROAD, SWAMPY AREAS; TIN MINE CREEK HAS DEEPLY DISSECTED SEDIMENTS ON THE WESTERN SIDE OF THE FIELD AND NOW FLOWS OVER TAILING UP TO 30 FT THICK; ELEVATION IS AT STIRLING HILL THE HIGHEST POINT IN THE FIELD AND ON A RIDGE WHICH DIVIDE THE VALLEY BETWEEN THE DRAINAGE OF THE AGNES RIVER AND TIN MINE RIVER.

Commodities

Commodity Importance
Gold Primary
Silver Secondary

Materials information

Materials Type of material
Gold Ore

Host and associated rocks

  • Host or associated Host
    Rock type Sedimentary Rock > Chemical Sediment > Iron Formation
    Rock unit name Nova Lima Group;Nova Lima Group
    Rock description Nova Lima Group;Nova Lima Group

Nearby scientific data

(1) -43.81228, -20.03999
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Economic information

Ore body information

  • Name URUBU
    Strike N
    Dip E

Comments on the geologic information

  • AGNES FORMATION ALSO INCLUDES LIGNEOUS CLAYS AND BROWN COAL; FERRUGINIZED CONCRETIONS UP TO 9 IN DIA ARE PLENTIFUL IN SOME WORKINGS; OLIGOCENE BASALT (OLDER VOLCANICS) FOUND AS SMALL PATCHES IN THE TERITIARY SEDIMENTS. POSSIBLE BEDROCK SOURCE OF TIN IS THE STANNIFEROUS GRANITES OF THE WILSON PROMONTORY SOME 20 MI TO THE SE; AGNES FORMATION HAS MAXIMUM THICKNESS OF 200 FT RESTING UNCONFORMABLE ON LOWER CRETACEOUS MUDSTONES AND FELSPATHIC SANDSTONES.

Economic information about the deposit and operations

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

Mining district

District name Nova Lima District

Ownership information

  • Type Operator
    Owner St. John Del Rey Mining Co.
    First year 1934
    Last year 1936

Comments on the production information

  • ANNUAL PRODUCTION: DATA FROM TABLE 17 IN REFERENCE; SN CONCENTRATE (1) = UNKNOWN; SN CONCENTRATE (2) = GREAT SOURTHERN TIN MINING CO; ORE (3) AND SN CONCENTRATE (3) = FRANKLIN RIVER HYDRAULIC SLUICING CO.; ORE (4) = TOORA TIN MINING CO.; SN CONCENTRATE (5) = JOHN LIGHTHILL; SN CONCENTRATE (6) AND ORE (6) = TOORA PROPRIETARY TIN-FIELD LTDS; SN CONCENTRATE (7) = N.T. PITCAIRN; SN CONCENTRATE (8) = THE BEST 'OLE TIN AND GOLD MINING CO; SN CONCENTRATE (9) = LEASE 4958 GIPPSLAND, TOORA; SN CONCENTRATE (10) = AGNES STIRLING N.L. CUMULATIVE PRODUCTION: SN CONCENTRATE (1) = TOTAL REPORTED PRODUCTION FOR FIELD; SN CONCENTRATE (9) = LEASE 4958 GIPPSLAND, TOORA.
  • NO REGULAR PRODUCTION RECORDED

Comments on the reserve resource information

  • YEARS OF 5-12 G/T AU RESERVES 1934-1936, EXPLORATION FOUND LOW GRADE, SMALL ORE BODIES

Comments on the workings information

  • MAIN WORKINGS ADJACENT TO THE "NORTH WALL," THE NE MARGINAL FAULT SCARP, WITH PITS OF THE GREAT SOUTHERN WORKING, PITCIARN WORKING, AND AGNES RIVER WORKINGS, SOME WHICH ARE UP TO 20 CHAINS IN DIAMETER; SMALLER OPERATIONS ON THE FAR EASTERN SIDE OF THE BASIN INCLUDE THE GRANITE BAR AND GRANITE BAR EXTEND WORKINGS; TAILINGS ALONG TIN MINE CREEK ARE UP TO 30 FT THICK.

Comments on development

  • LEASES WERE FIRST TAKEN UP IN 1888, WITH SMALL SCALE PRODUCTION BEGINNING IN 1892; 50 YEARS OF PRODUCTION WAS PLAGUED BY LACK OF WATER AND A WATER DELIVERY SYSTEM BUILT FROM THE AGNES RIVER WAS NOT COMPLETELY SATISFACTORY; DREDGE LAUNCHED BY TOORA MINING CO. MARGINAL ECONOMICAL DUE TO LOW ORE VALUES AND MINING TERMINATED IN 1914; MINING BY HYDRAULIC SLUICING CONTINUED ON A SMALLER SCALE (1915 - 1939); RECOVERY OF CASSITERITE IN THE FIELD COMPLICATED BY CLAY WHICH FOULED SLUICE BOXES AND IN LAUNDERS RESULTING IN SIGNIFICANT LOSS OF CASSITERITE TO TAILINGS; THE FIELD WAS EXTENSIVELY EVALUATED BY THE MINES DEPARTMENT OF VICTORIA FOLLOWING WORLD WAR II INCLUDING EXTENSIVE DRILLING SUGGESTS THE FIELD IS WORKED OUT. ; ECON.COM: MOST COMPANIES IN THE FIELD ARE THOUGHT TO HAVE OPERATED MARGINALLY.

Reference information

Bibliographic references

  • Deposit

    GAIR, J.E., 1962, GEOLOGY AND ORE DEPOSITS OF THE NOVA LIMA AND RIO ACIMA QUADRANGLES, MINAS GERAIS, BRASIL: U.S. GEOLOGICAL SURVEY PROFESSIONAL PAPER 341-A, 67 P.

  • 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.

  • Other Database

    CIMRI

  • Production

    GAIR (1963)

General comments

Subject category Comment text
Deposit MODELING NOTES: REPORTED TIN CONCENTRATES PRODUCED IN THE FIELD IS ABOUT 407.4 TONS; THIS IS ABOUT 259 MT OF TIN METAL; THE TIN GRADE IS ESTIMATED TO BE 0.14 KG PER CM USING THE REPORTED PRODUCTION DATA FROM 1904,1908-1909,1910-1911, AND 1914; NO DATA ARE AVAILABLE FOR GOLD PRODUCTION BUT GRAVELS WORKED IN THE EARLY YEARS ARE REPORTED AS CONTAINING 8 GRAINS GOLD FOR EVERY 7 LB OF CASSITERITE; THIS SUGGEST THAT A GOLD GRADE OF 0.023 G PER CM; TOTAL REPORTED TIN PRODUCED SUGGESTS THAT THE TOTAL VOLUME WORKED IS 1,840,000 CM; NO RESERVES SUGGESTED.
Deposit TIN GRAVELS LENTICULAR, UNCONSOLIDATED; LOCALLY MAY BE CEMENTED BY IRON OXIDE ACROSS BEDDING; PRELIMINARY ASSIGNMENT TO STEAM PLACER SN MODEL TYPE.

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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