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B-7

Occurrence in Guanacaste, Costa Rica with commodity Chromium
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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. Mineral occurrence model information
  9. Host and associated rocks
  10. Nearby scientific data
  11. Geologic structures
  12. Ore body information
  13. Economic information about the deposit and operations
  14. Links to other databases
  15. Bibliographic references
  16. General comments
  17. Reporter information

Geologic information

Identification information

Deposit ID 10007790
MRDS ID CS00001
Record type Site
Current site name B-7

Geographic coordinates

Geographic coordinates: -85.76107, 10.88715 (WGS84)

Site location context

Political divisions (FIPS codes)

Guanacaste(province)

Costa Rica(country)

North America(continent)

Land(continent)

Geographic areas

Country State
Costa Rica Guanacaste

Comments on the location information

  • ABOUT 65 M SE OF ELENA (489 M ELEVATION). LOCATION B-7 OF JAGER (1977).

Commodities

Commodity Importance
Chromium Critical Primary

Materials information

Materials Type of material
Chromite Ore

Alteration

  • (Local) Ore Consists Of Massive And Altered, Or Laterized, Chromite. Lateritic Soil Is Less Completely Developed, Fe Oxides Less Abundant, And Serpentinization More Intense At This Prospect Than At The Prospects Of Mrds Rec. Nos. 3-8 (Area A Of Jager (1977)).

Analytical data

Result GRADES OF 5 SAMPLES: 25.50-32.44 % CR
Result AVERAGE GRADE: 28.23 % CR

Mineral occurrence model information

Model code 15
USGS model code 8a
Deposit model name Podiform chromite (minor)
Mark3 model number none

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock
  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Dunite

Nearby scientific data

(1) -85.76107, 10.88715
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Numerous Generally S-Dipping Fractures. Mafic Dikes Appear To Limit Mineralization Towards The E.

Ore body information

  • General form POD
    Strike N 74 W
    Dip 68 N

Comments on the geologic information

  • THE HARZBURGITE AND LHERZOLITE ARE CUT BY MAFIC DIKES TRENDING N 5 E AND N 10 W. A FAULT TRENDING N 20 E AND DIPPING 41 NW CUTS THE DIKES.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant No

Comments on development

  • LIMITED TO CLEARING OFF OUTCROP.

Reference information

Bibliographic references

  • Deposit

    JAGER C., GERARDO, 1977, GEOLOGIA DE LAS MINERALIZACIONES DE CROMITA AL ESTE DE LA PENINSULA DE SANTA ELENA, PROVINCIA DE GUANACASTE, COSTA RICA: TESIS DE GRADO, UNIVERSIDAD DE COSTA RICA, 136 P.

  • Deposit

    KUYPERS, E. P., AND JAGER C., G., 1979, MINERALIZACIONES DE CROMITA EN LA PENINSULA DE SANTA ELENA, COSTA RICA: CIENC. TEC., V. 3, NO. 1, P. 99-108.

  • Deposit

    U.S. GEOLOGICAL SURVEY, DIRECCION GENERAL DE GEOLOGIA, MINAS E HIDROCARBUROS, UNIVERSIDAD DE COSTA RICA, 1987, MINERAL RESOURCE ASSESSMENT OF THE REPUBLIC OF COSTA RICA: U.S. GEOLOGICAL SURVEY MISCELLANEOUS INVESTIGATION SERIES MAP I-1865, 75 P.

General comments

Subject category Comment text
Deposit SMALL POCKETS OF CHROMITE IN SERPENTINIZED HARZBURGITE AND LHERZOLITE ARE EXPOSED IN AN OUTCROP. THE CHROMITE AND PERIDOTITE ARE HIGHLY FRACTURED.
Deposit JAGER (1977) COLLECTED CHIP SAMPLES. ; INFO.SRC : 1 PUB LIT

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1986 Howe, Stephen S. U.S. Geological Survey PARSED HOST ROCK AND ASSOCIATED ROCK INFORMATION FROM OLD SINGLE VALUED FIELD TO NEW MULTIVALUED FIELD
Editor 27-APR-1995 Mosier, Dan U.S. Geological Survey

Beyond USGS

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

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