Barrio Pasto Deposits

Occurrence in Puerto Rico, United States with commodities Copper, Silver
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. Controls for ore emplacement
  11. Economic information about the deposit and operations
  12. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10085438
MRDS ID W701029
Record type Site
Current site name Barrio Pasto Deposits

Geographic coordinates

Geographic coordinates: -66.43363, 18.28955 (WGS84)
Relative position ABOUT 4 MILES SOUTHWEST OF MOROVIS AND THE SAME DISTANCE SOUTHEAST OF CIALES

Site location context

Political divisions (FIPS codes)

Morovis Municipio(county)

Puerto Rico(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Ciales(quadrangle 1:24,000 scale)

Puerto Rico C(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Puerto Rico(hydrologic accounting unit)

Puerto Rico(hydrologic subregion)

Caribbean(hydrologic region)

Geographic areas

Country State
United States Puerto Rico

Commodities

Commodity Importance
Copper Primary
Silver Primary

Materials information

Materials Type of material
Bornite Ore
Chalcocite Ore
Chalcopyrite Ore
Pyrite Ore

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Late Cretaceous
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite
    Rock unit name Avispa Formation
    Rock description Avispa Formation

Nearby scientific data

(1) -66.43363, 18.28955

Economic information

Controls for ore emplacement

  • The Andesite Is Highly Fractured, And Presumably The Disposition Of The Ore Has Been At Least Partially Conditioned By These Fractures. The Richest Concentrations Of Ore Occur Where Fractures Intersect.

Comments on the geologic information

  • THE ROCKS OF THE REGION CONSIST OF PORPHYRITIC AND BRECCIATED ANDESITES FORMING AN APOPHYSIS OR DYKE WHICH INTRUDES WARPED CALCAREOUS CLAYS AND CALCAREOUS TUFFS.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant No

Comments on the production information

  • ABOUT 60 TONS OF GRADED ORE WERE SHIPPED TO THE UNITED STATES FOR SEPARATION AND REFINING, BUT NOTHING FURTHER HAS BEEN DONE TO EXPLOIT THE REGION (MITCHELL, 1954, P. 108).

Comments on the reserve resource information

  • IN CERTAIN PARTS OF THE VEINS, THE COPPER CONTENT REACHES 3 PERCENT, ALONG WITH NATIVE GOLD AND SILVER; NO ESTIMATES HAVE BEEN MADE OF AVAILABLE TONNAGE, NOR HAVE ENOUGH SAMPLES BEEN ANALYZED TO ESTABLISH TENOR OF ORE (MITCHELL, 1954, P. 108).

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit TWO TYPES OF ORE ARE PRESENT: (1) PRIMARY SULFIDES, INCLUDING PYRITE, CHALCOPYRITE, AND BORNITE, CLOSELY RELATED TO QUARTZ AND CALCITE; (2) OXIDATION AND SECONDARY ENRICHMENT HAS RESULTED IN FORMATION OF CHALCOCITE, MALACHITE, AZURITE, CHRYSOCOLLA, LIMONITIC PRODUCTS, AND SMALLER QUANTITIES OF RARER SECONDARY MINERALS. IN PLACES THERE IS TOTAL SUBSTITUTION OF CHALCOCITE FOR CHALCOPYRITE AND BORNITE, AND THROUGHOUT, VARIOUS STAGES OF SUBSTITUTION ARE EVIDENT.
Deposit [PREVIOUS UPDATER: SCHELLEKENS, J.H., 91 07, UPR.]

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JAN-1990 Paidakovich, Matthew E. U.S. Geological Survey
Updater 01-SEP-1991 Paidakovich, Matthew E. U.S. Geological Survey

Beyond USGS

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