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  3. Mineral Resource Data System (MRDS)

San Francisco Mine

Occurrence in Alajuela, Costa Rica with commodities Gold, Silver
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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 10007934
MRDS ID CS00172
Record type Site
Current site name San Francisco Mine

Geographic coordinates

Geographic coordinates: -84.46382, 9.97192 (WGS84)

Site location context

Political divisions (FIPS codes)

Alajuela(province)

Costa Rica(country)

North America(continent)

Land(continent)

Geographic areas

Country State
Costa Rica Alajuela

Comments on the location information

  • ON SACRA FAMILIA VEIN.

Commodities

Commodity Importance
Gold Primary
Silver Primary

Materials information

Materials Type of material
Chalcopyrite Gangue
Galena Gangue
Pyrite Gangue
Quartz Gangue
Rhodochrosite Gangue
Rhodonite Gangue
Zeolite Gangue

Alteration

  • (Local) Silicification, Oxidation, Supergene. In Weathered Zone, Andesite Is Bleached, Kaolinitized, And Limonitized . Fe And Mn Oxides Stain Fractures. Sericite, Pyrite.

Mineral occurrence model information

Model code 151
USGS model code 25d
Deposit model name Epithermal vein, Sado
Mark3 model number 28

Host and associated rocks

  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite
    Rock unit name Aguacate Formation
    Rock description Aguacate Group;

Nearby scientific data

(1) -84.46382, 9.97192
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Nearly Vertical Fault

Ore body information

  • General form VEIN
    Strike N 45 E
    Dip 75 N
    Thickness 3M
    Length 2000M

Comments on the geologic information

  • COMB-TEXTURED, EUHEDRAL QUARTZ.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Significant No

Comments on the workings information

  • TRENCH ACROSS VEIN.

Reference information

Bibliographic references

  • Deposit

    VISITED BY USGS SCIENTISTS, 1986.

  • Deposit

    DIRECCION GENERAL DE GEOLOGIA, MINAS E HIDROCARBUROS (DGMH) UNPUBLISHED FILES VIEWED 1986.

  • 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 ORE OCCURS IN NEARLY VERTICAL TO SW-RAKING PODS IN A NE-TRENDING VEIN ALONG A NEARLY VERTICAL FAULT. THE PODS ARE ABOUT 60-100 M WIDE. VEIN MATERIAL IS BRECCIATED.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1986 Howe, Stephen S.; Bagby, William C.; Cox, Dennis P., Marsh, Sherman P. 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.

Maps centered on this site