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Deposit No. 3

Occurrence in Puerto Rico, United States with commodities Iron, Limestone, High Calcium
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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. 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. Mining district
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10085524
MRDS ID W701127
Record type Site
Current site name Deposit No. 3

Geographic coordinates

Geographic coordinates: -65.84167, 18.19566 (WGS84)
Relative position 1/2 MILE SOUTHEAST OF DEPOSIT NO. 2

Site location context

Political divisions (FIPS codes)

Las Piedras Municipio(county)

Puerto Rico(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Humacao(quadrangle 1:24,000 scale)

Puerto Rico(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Eastern(hydrologic unit)

Puerto Rico(hydrologic accounting unit)

Puerto Rico(hydrologic subregion)

Caribbean(hydrologic region)

Geographic areas

Country State
United States Puerto Rico

Commodities

Commodity Importance
Iron Primary
Limestone, High Calcium Primary

Materials information

Materials Type of material
Hematite Ore
Limestone Ore
Magnetite Ore
Calcite Gangue
Chlorite Gangue
Garnet Gangue

Analytical data

Result CHIP ASSAYS: 0.40 OZ AG
Result 0.03% CU
Result 66.5% FE. QUALITATIVE ANALYSES INDICATE THAT THE LIMESTONE SHOULD YIELD A GOOD GRADE OF LIME (FETTKE, 1924, P. 1035).

Mineral occurrence model information

Model code 62
USGS model code 18d
Deposit model name Skarn Fe

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite
    Stratigraphic age (youngest) Early Cretaceous
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone

Nearby scientific data

(1) -65.84167, 18.19566
ListMap

Economic information

Controls for ore emplacement

  • The Magnetite Deposit Occurs In The Upper Portion Of The Limestone, Just Below Its Contact With The Overlying Andesite.

Comments on the geologic information

  • THE OUTCROP OF THIS DEPOSIT, THOUGH NOT VERY CONSPICUOUS AT THE SURFACE, IS OF CONSIDERABLE INTEREST BECAUSE THE RELATIONSHIP OF THE MAGNETITE, AND CONTACT METAMORPHIC MINERALS ASSOCIATED WITH IT, TO THE COLLORES LIMESTONE IS BROUGHT OUT MORE CLEARLY THAN AT DEPOSITS NO. 1, 2, 4, AND 5. THE SAN LORENZO BATHOLITH LIES ABOUT 1/3 MILE TO THE SOUTHWEST.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Both
Deposit size Small
Significant No

Mining district

District name Humacao District

Comments on the production information

  • LIMESTONE HAS BEEN QUARRIED; QUALITATIVE ANALYSES INDICATE THAT THE LIMESTONE SHOULD YIELD A GOOD GRADE OF LIME (FETTKE, 1924, P. 1034-5).

Comments on development

  • A SMALL QUARRY HAS BEEN OPENED FROM WHICH LIMESTONE HAS BEEN TAKEN FOR BURNING INTO LIME FOR LOCAL USE.

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., 196X, REPORT ON GEOLOGIC RECONNAISSANCE IN THE NAGUABO-HUMACAAO PERMIT AREA; BY SHOWLOW MINING CORP, IN DEPT. OF NATURAL RESOURCES,PUERTO RICO.

  • Deposit

    FETTKE, C. R., 1924, MAGNETITE DEPOSITS OF EASTERN PORTO RICO: AM. INST. MINING METALL. ENG. TRANS., V. 70, P. 1024-1042.

General comments

Subject category Comment text
Deposit THE MAGNETITE ASSOCIATED WITH METAMORPHOSED LIMESTONE OCCURS NEAR THE TOP OF A NORTHWEST-SOUTHEAST RIDGE. NUMEROUS OUTCROPS OF NEARLY PURE CRYSTALLINE LIGHT GRAY AND WHITE LIMESTONE APPEAR ON THE SOUTHWEST FLANK OF THIS RIDGE. THE STRIKE OF THE FORMATIONS IS N 54 W AND THE DIP 32 NE. IT IS ESTIMATED THAT THE LIMESTONE IS AT LEAST 250 FT. THICK.
Deposit [PREVIOUS UPDATER AND DATE: BAWIEC, WALTER J., 90 07.]

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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