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Minillas, San German

Occurrence in Puerto Rico, United States with commodities Copper, Gold, Silver, Lead, Zinc
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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. Ore body information
  12. Controls for ore emplacement
  13. Economic information about the deposit and operations
  14. Ownership information
  15. Production statistics
  16. Workings at the site
  17. Links to other databases
  18. Bibliographic references
  19. General comments
  20. Reporter information

Geologic information

Identification information

Deposit ID 10085529
MRDS ID W701135
Record type Site
Current site name Minillas, San German
Alternate or previous names Quebrade Jicara

Geographic coordinates

Geographic coordinates: -66.9967, 18.06039 (WGS84)
Relative position 4 KM EAST FROM SAN GERMAN

Site location context

Political divisions (FIPS codes)

San Germán Municipio(county)

Puerto Rico(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Sabana Grande(quadrangle 1:24,000 scale)

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

Hydrologic units (watersheds)

Culebrinas-Guanajibo(hydrologic unit)

Puerto Rico(hydrologic accounting unit)

Puerto Rico(hydrologic subregion)

Caribbean(hydrologic region)

Geographic areas

Country State
United States Puerto Rico

Comments on the location information

  • SOUTH ALONG THE UNMARKED ROAD UP QUEBRADA, THREE ADITS AND A CONNECTING STAF ABOVE THE PIG FARM ALONG THE EAST SIDE OF THE VALLEY.

Commodities

Commodity Importance
Copper Primary
Gold Primary
Silver Primary
Lead Primary
Zinc Critical Primary

Materials information

Materials Type of material
Bornite Ore
Chalcocite Ore
Chalcopyrite Ore
Copper Ore
Gold Ore
Malachite Ore
Calcite Gangue
Iron Gangue
Quartz Gangue

Alteration

  • (Local) Minor Sercite Marginal To Vein

Analytical data

Result GOLD TO SEVERAL OUNCES PER TON COMMON IN SELECTED SAMPLES

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
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite

Nearby scientific data

(1) -66.9967, 18.06039
ListMap

Economic information

Ore body information

  • General form SINUOUS SHEAR / VEIN SYSTEM IN SPEPENTINITE
    Strike N 75 W
    Dip 90
    Thickness 20M
    Length 1000M
    Width 1M
    Depth to top 10M
    Depth to bottom 40M

Controls for ore emplacement

  • Fault

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1750
Discoverer Spanish

Ownership information

  • Type Owner
    Owner Codremi - 84, Cominco - 90

Production statistics

  • Year 1921
    Period 1918-1921
    Material CU, AU
    Accuracy Estimate
    Description Cp_Grade: ^Cu=2.3%, Au=0.892 Oz
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Gold Gold 25g/mt
    Major Copper Copper 2wt-pct

Comments on the reserve resource information

  • THE COPPER CONTENT IS TOO LOW EVER TO RESULT IN A PROFITABLE VENTURE AS A COPPER MINE, BUT SILVER AND ESPECIALLY GOLD SEEM TO BE PRESENT IN ENCOURAGING AMOUNTS, AND PERHAPS THE MINE COULD BE WORKED AS A JOINT COPPER-GOLD-SILVER PROJECT (MITCHELL, 1954, P. 108).

Workings at the site

  • Type of workings Unknown
    Length 50M
    Overall depth 10M
    Overall length 137.16M
    Overall width 1.5M

Comments on the workings information

  • THREE ADITS CONNECTED BY SEVERAL RAISES EXPLORE THE VEIN FOR 150 METERS.

Comments on development

  • EXTENSIVE SOIL SURVEY AND THREE DRILL HOLES BY CODRIME = NO EXTENSIONS FOUND.

Reference information

Bibliographic references

  • Deposit

    COX, DENNIS P., AND BRIGGS, REGINALD P., 1973, METALLOGENIC MAP OF PUERTO RICO: U.S. GEOLOGICAL SURVEY, MISCELLANEOUS GEOLOGIC INVESTIGATIONS MAP I-721, ACCOMPANIED BY EXPLANATORY PAMPHLET, 6 P.

  • Deposit

    LUDDEN, R.B., 1961, REPORT ON GEOLOGIC RECONNAISSANCE IN TEH CABO ROJO AND SAN GERMAN-SABANA GRANDE PERMIT AREA,PUERTO RICO: PHELPS DODGE PRIVATE REPORT ON FILE AT THE DEPARTMENT OF NATURAL RESOURCES, PUERTO RICO.

  • Deposit

    LAMPAYA, J. A., 1984, EVALUACION MINERO-METALURGICA DE MINILLAS I: CONSULTANT ENGINEERS AND ASSOCIATES PRIVATE REPORTS I & II ON FILE AT THE DEPARTMENT OF NATURAL RESOURCES, PUERTO RICO.

  • Deposit

    MITCHELL, R. C., 1954, A SURVEY OF THE GEOLOGY OF PUERTO RICO: PUERTO RICO UNIV., AGR. EXPT. STA. TECH. PAPER 13, 167 P.

General comments

Subject category Comment text
Deposit LONG POLYMETALLIC VEIN SYSTEM, ONLY WIDER THAN .5 METERS IN A VERY FEW PLACES. OXIDIZED TO 25 METERS.
Deposit Discovery Year: 1700'S
Deposit VEIN APPEARS FOLDED OR AT LEAST SINUOUS. POTENTIAL IS LIMITED TO THE WIDER PORTIONS OF THE VEIN. [PREVIOUS UPDATER AND DATE: MCKELVEY, G. E., 90 07.] ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT

Reporter information

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

Beyond USGS

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

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