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Onverdacht

Producer in Suriname with commodities Aluminum, Silica, Ferrosilicon, Iron
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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. Mineral occurrence model information
  8. Host and associated rocks
  9. Nearby scientific data
  10. Geologic structures
  11. Ore body information
  12. Economic information about the deposit and operations
  13. Mining district
  14. Ownership information
  15. Reserves and resources
  16. Workings at the site
  17. Links to other databases
  18. Bibliographic references
  19. General comments
  20. Reporter information

Geologic information

Identification information

Deposit ID 10068727
MRDS ID W001967
Record type Site
Current site name Onverdacht
Alternate or previous names Billiton

Geographic coordinates

Geographic coordinates: -55.19618, 5.59046 (WGS84)
Relative position 35 KM SOUTHWEST OF PARAMARAIBO, BETWEEN ROAD TO ZANDERY AND SURINAME RIVER. 10 KM SOUTH OF LELYDORP.

Site location context

Political divisions (FIPS codes)

Suriname(country)

South America(continent)

Land(continent)

Geographic areas

Country
Suriname

Commodities

Commodity Importance
Aluminum Critical Primary
Silica, Ferrosilicon Secondary
Iron Secondary

Comments on the commodity information

  • COLLUVIAL BURIED.

Materials information

Materials Type of material
Bauxite Ore
Boehmite Ore
Gibbsite Ore
Hematite Gangue
Kaolinite Gangue
Zircon Gangue

Analytical data

Result BAUXITE IS VERY HIGH GRADE TRIHYDRATE TYPE WITH LITTLE BOEHMITE OR SILICA. GENERAL COMPOSITION: AL2O3 = 53.15-59.60%, SIO2 = 3.26-6.53%, FE2O3 = 1.12-13.61%, TIO2 = 1.77-2.00%, H2O = 28.21-30.75%. PATTERSON AND OTHERS (1986) REPORT METAL GRADE OF AL2O3: 60.0%, 59.1%, 58.5%, 58.6%, 55-59.2%
Result SIO2: 3.4%, 3.8%, 4.3%, 3.9%
Result FE2O3: 2.7%, 3.4%, 4.0%, 4.4%, 3.8-10%
Result TIO2: 2.5%, 2.7%, 2.4%, 2.4%: H2O: 31.4%, 31.0%, 30.8%, 30.7%, AND CHEMICAL GRADE OF AL2O3: 60.8%, 60.1%, 59.3%
Result SIO2: 3.6%, 4.6%, 6.1%
Result FE2O3: 1.2%, 1.4%, 1.2%
Result TIO2: 2.8%, 2.6%, 2.5%
Result H2O: 31.6%, 31.3%, 30.9%. (VALUES GIVEN IN WEIGHT PERCENT).

Mineral occurrence model information

Model code 111
USGS model code 38b
Deposit model name Bauxite, laterite type

Host and associated rocks

  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock
    Stratigraphic age (youngest) Eocene
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Sandstone
    Rock unit name White Sand Formation;Berbice Formation
    Rock description White Sand Formation;Berbice Formation

Nearby scientific data

(1) -55.19618, 5.59046
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Dip South.

Ore body information

  • General form TABULAR, BLANKET
    Thickness 17M
    Depth to top 25M
    Depth to bottom 42M

Comments on the geologic information

  • GEOL.COM: BAUXITE OF SEDIMENTARY ORIGIN, BAUXITIZATION OF ARKOSIC OR SILTY MATERIAL. THE DEPOSIT IS IN SEDIMENTARY BEDS IN THE COASTAL PLAIN AND IS BURIED BENEATH LATE OLIGOCENE-MIOCENE PURE QUARTZ SANDS, CLAYS, PEATY CLAYS, AND KAOLINITIC SANDS, ALL UNCONSOLIDATED. BED COVERED BY COROPINA FM. TYPICAL STRAT SECTION: LELYDROP SAND, 1.5-4.5 M; COROPINA CLAY, 6-16.0 M; TRANSITION ZONE: UNCONSOLIDATED SANDS, SILTS AND CLAYS, 0.8-1.5 M; BAUXITE FERRITE, 5.0-17.0 M; SED. CLAY (KAOLINIZED), 11.0-16.0 M; COARSE SAND. SURFACE OF BAUXITE BED IS SLIGHTLY DOMED, FLAT TOPOGRAPHY WITH INCISED CREEKS.

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Significant No
Year of first production 1942

Mining district

District name Paranam

Ownership information

  • Type Operator
    Owner N. V. Billiton Maatschappij
  • Type Owner
    Owner Billiton Maatschappij Surinam

Reserves and resources

  • Type In-situ
    Estimate year 1979
    Total resources 60000000000mt ore
    Commodity Subtype Grade units Group Importance Year
    Aluminum Al2O3 50 wt-pct Aluminum Major 1979
    Silica, Ferrosilicon SiO2 5 wt-pct Silica Minor 1979
    Iron FeO3 4 wt-pct Iron Minor 1979

Workings at the site

  • Type of workings Surface
    Overall depth 30M
    Overall length 914.4M
    Overall width 50M

Comments on the workings information

  • DEPTH TO TOP HAS INCREASED FROM FIVE METERS TO 25 METERS, WILL CONTINUE TO INCREASE AS MINING MOVES DOWNSLOPE (N.)

Comments on development

  • SURFACE BELOW SEA-LEVEL.

Reference information

Bibliographic references

  • Deposit

    ALEVA, G.J.J., MONTAGNE, D.G., AND VAN GINKEL, IR.R., 1967, GEOLOGY AND MINING OF THE ONVERDACHT BAUXITE DEPOSIT, SURINAM: N.V. BILLITON MAATSCHAPPIJ SURINAM, 44 P., ILLUS, (INCL. SKETCH MAPS).

  • Deposit

    VAN KERSEN, J.F., 1956-58, BAUXITE DEPOSITS IN SURINAME AND DEMERATA (BRITISH GUIANA), FROM LEIDSE GEOLOGISCHE MEDEDELINGEN, DEEL 21, AFLEVERING 1, P. 286-299, ILLUS. (INCL. SKETCH MAP).

  • Deposit

    KROOK, L., 1969, THE ORIGIN OF BAUXITE IN THE COASTAL PLAIN OF SURINAM AND GUYANA: IN CONTRIBUTIONS TO THE GEOLOGY OF SURINAM, SURINAM GOVT. GEOL. AND MINING SERV., DEPT. MINES, FORESTS AND LANDS, PP. 173-179, ILLUS.

  • Deposit

    PATTERSON, S.H., KURTZ, H.F., OLSON, J.C., AND NEELEY, C.L., 1986, WORLD BAUXITE RESOURCES: U.S. GEOLOGICAL SURVEY PROFESSIONAL PAPER 1076-B, 151 P.

  • Deposit

    ECONOMIC GEOLOG, V. 76, P. 1142-1152.

  • Deposit

    DIXON, C.J., 1979, ATLAS OF ECONOMIC MINERAL DEPOSITS: ITHACA, NEW YORK, CORNELL UNIVERSITY PRESS, P. 16-17.

  • Production

    DIXON, 1979

General comments

Subject category Comment text
Deposit MUSHROOM-SHAPED OREBODY. CONTINENTALLY DERIVED DETRITAL

Reporter information

Type Date Name Affiliation Comment
Reporter 01-APR-1973 Bannigan, Jane L. U.S. Geological Survey
Updater 01-APR-1988 Leonard, Kenneth R. U.S. Geological Survey
Updater 01-AUG-1993 Gray, Floyd U.S. Geological Survey

Beyond USGS

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

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