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  3. Mineral Resource Data System (MRDS)

Los Bolillos Mine

Occurrence in Guanacaste, Costa Rica with commodity 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. Mineral occurrence model 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 10007851
MRDS ID CS00080
Record type Site
Current site name Los Bolillos Mine
Alternate or previous names Roberts 1944 Reports That Mine May Formerly Have Been Called El, Pavo Or Las Masas. Sears 1919 Calls These Deposits El Pavo and Las, Mesas, As Prospects In the Lagarto Area. Includes the Pozo Azul and Pozo, Norte Workings.

Geographic coordinates

Geographic coordinates: -85.70274, 10.1358 (WGS84)
Elevation 164

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 5 KM E OF EL ESPAVELAR MINE (MRDS REC. NO. 81).

Commodities

Commodity Importance
Manganese Critical Primary

Analytical data

Result SAMPLES FROM DUMP HAD 28.03 % MN
Result 12.45 % FE
Result AND 27.10 % INSOLUBLE MATTER

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 Volcanic Rock (Aphanitic) > Mafic Volcanic Rock > Basalt

Nearby scientific data

(1) -85.70274, 10.1358
ListMap

Economic information

Ore body information

  • General form POCKETS AND VEINLETS IN JASPER ZONE
    Length 18M
    Width 2.5M

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant No

Mining district

District name Rio Seco-Lagarto District

Ownership information

  • Type Operator
    Owner E. W. Creevy

Comments on the production information

  • NO ORE SHIPPED, BUT CONSIDERABLE EXPLORATORY ACTIVITY.

Comments on the reserve resource information

  • ABOUT 75 METRIC TONNES HAVE BEEN PILED ON DUMPS. A SMALL TONNAGE MIGHT STILL BE FOUND BY FURTHER EXPLORATION, BUT PROBABLY NOT ENOUGH TO JUSTIFY CONSTRUCTION OF BETTER ROAD.

Comments on the workings information

  • SURFACE CUTS AND TRENCHES UP TO 24 M LONG; SHAFT AT POZO AZUL.

Comments on development

  • CONSIDERABLE EXPLORATORY WORK ON SITE: TRENCHES AND SHAFT ON WEST SIDE DUG BY H. MANN CO. IN 1918, OPEN CUTS ON EAST SIDE BY E. W. CREEVY IN 1940.

Reference information

Bibliographic references

  • Deposit

    SEARS, J. D., 1919, DEPOSITS OF MANGANESE ORE IN COSTA RICA: U.S. GEOL. SURV. BULL. 710-C, P. 71-72.

  • Deposit

    ROBERTS, R. J., 1944, MANGANESE DEPOSITS IN COSTA RICA: U.S. GEOL. SURV. BULL. 935-H, P. 403.

  • 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.

  • Production

    ROBERTS (1944)

General comments

Subject category Comment text
Deposit SMALL OREBODIES OF SMALL POCKETS AND VEINLETS OF MN OXIDE IN IRREGULAR JASPER ZONES TRENDING N AND E AND REPLACING BASALT. THE 18-M-LONG, 2.5-M-WIDE OREBODY EXPOSED IN A CUT 60 M E OF POZO AZUL EXTENDS ONLY A FEW METERS BELOW THE SURFACE. THE OREBODIES EXPLORED TO THE NE OF THIS CUT ARE ALSO SHALLOW.

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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