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Cerro Grande Occurrence

Occurrence in Guanacaste, Costa Rica with commodities Iron, Manganese
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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. Ore body information
  11. Economic information about the deposit and operations
  12. Mining district
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10007852
MRDS ID CS00082
Record type Site
Current site name Cerro Grande Occurrence

Geographic coordinates

Geographic coordinates: -85.4444, 10.13164 (WGS84)
Elevation 99

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

  • 2.5 KM SSE OF NICOYA, ON THE ROAD TO DULCE NOMBRE.

Commodities

Commodity Importance
Iron Primary
Manganese Critical Primary

Comments on the commodity information

  • OXIDES CONTAIN APPROX. EQUAL PERCENTAGES OF FE AND MN.

Materials information

Materials Type of material
Pyrolusite Ore

Mineral occurrence model information

Model code 97
USGS model code 24c
Deposit model name Volcanogenic Mn

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Mafic Volcanic Rock > Basalt
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Late Cretaceous
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Shale

Nearby scientific data

(1) -85.4444, 10.13164
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Economic information

Ore body information

  • General form LENTICULAR
    Length 9M
    Width 2M

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant No

Mining district

District name Nicoya-Pavones District

Comments on the reserve resource information

  • SMALL SIZE AND LOW GRADE OF OREBODIES DISCOURAGE FURTHER EXPLORATION.

Reference information

Bibliographic references

  • Deposit

    ROBERTS, R. J., 1944, MANGANESE DEPOSITS IN COSTA RICA: U.S. GEOL. SURV. BULL. 935-H, P. 412.

  • 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 ACCORDING TO ROBERTS (1944), "FOUR LENSES OF SILICEOUS IRON-MANGANESE OXIDE STRIKING N 50 W ARE EXPOSED NEAR THE ROAD, AND A FIFTH IN THE STREAM TO THE NORTHWEST." THE LARGEST LENS IS 9 M LONG AND 2 M WIDE. LOCALLY, THE ORE CONTAINS POCKETS AND VEINLETS OF PYROLUSITE. THE MN OXIDES APPEAR TO REPLACE SHALE.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAR-1986 Howe, Stephen S. U.S. Geological Survey

Beyond USGS

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

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