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La Cuesta De Matambu Occurrence

Occurrence in Guanacaste, Costa Rica with commodities Manganese, 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. Alteration
  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. Links to other databases
  15. Bibliographic references
  16. General comments
  17. Reporter information

Geologic information

Identification information

Deposit ID 10090459
MRDS ID CS00085
Record type Site
Current site name La Cuesta De Matambu Occurrence
Alternate or previous names La Cuesta De Matamba Occurrence

Geographic coordinates

Geographic coordinates: -85.44302, 10.11914 (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 3 KM SE OF NICOYA, ON THE ROAD TO MATAMBU. ACCORDING TO ROBERTS (1944), THE DEPOSIT IS ABOUT HALFWAY UP THE N SLOPE OF A HILL RISING 200-250 M ABOVE THE RIO POTRERO VALLEY, THE FIRST HIGH HILL S OF THE RIVER, AT THE FARM OF VINCENTE FAJARDO. THERE ARE OTHERS SHOWINGS JUST N OF MATAMBU.

Commodities

Commodity Importance
Manganese Critical Primary
Iron Primary

Comments on the commodity information

  • OREBODIES APPEAR TO BE SMALL, LOW GRADE, AND SILICEOUS. SOME FLOAT PIECES ARE HIGH GRADE.

Alteration

  • (Local) Silicification

Mineral occurrence model information

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

Host and associated rocks

  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Shale

Nearby scientific data

(1) -85.44302, 10.11914
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Slickensided Surfaces On Boulders Of Light-Colored And Red Metamorphic Rock

Ore body information

  • General form VEIN, LENTICULAR
    Length 3M
    Width 1M

Comments on the geologic information

  • SEARS (1919) CLAIMS THAT THE HOST ROCK IS A HIGHLY WEATHERED IGNEOUS ROCK, WHILE ROBERTS (1944) STATES THAT THE HOST ROCKS ARE SHALE AND CHERT INTERCALATED WITH BASALT. SEARS (1919) ALSO NOTES SOME LIGHT-COLORED AND RED METAMORPHIC ROCK NEARBY.

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 workings information

  • ROAD CUT AND STREAM CUT.

Reference information

Bibliographic references

  • Deposit

    SEARS, J. D., 1919, DEPOSITS OF MANGANESE ORE IN COSTA RICA: U.S. GEOL. SURV. BULL. 710-C, P. 79.

  • Deposit

    ROBERTS, R. J., 1944, MANGANESE DEPOSITS IN COSTA RICA: U.S. GEOL. SURV. BULL. 935-H, P. 411.

  • 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 SEARS (1919) STATES THAT THE DEPOSIT CONSISTS OF A VEIN CUTTING IGNEOUS ROCK AND OF FLOAT PIECES AND BOULDERS DOWNSLOPE AND IN A STREAM GULLY. ROBERTS (1944) STATES THAT MN OXIDES OCCUR IN SMALL LENSES REPLACING SHALE AND CHERT. ONE OF THE LENSES IS 3 M LONG AND 15 CM TO 1 M WIDE, AND ANOTHER IS 1.5 M LONG AND 30 CM WIDE.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAR-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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