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La Mina, Rio Blanca

Occurrence in Puerto Rico, United States with commodities Iron, Copper, 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 10085459
MRDS ID W701050
Record type Site
Current site name La Mina, Rio Blanca
Alternate or previous names Spanish Adit

Geographic coordinates

Geographic coordinates: -65.80945, 18.26177 (WGS84)
Elevation 152

Site location context

Political divisions (FIPS codes)

Naguabo Municipio(county)

Puerto Rico(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

El Yunque(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)

Federal lands

El Yunque National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

El Toro Wilderness(Wilderness)

Wilderness FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State
United States Puerto Rico

Comments on the location information

  • LIES WITHIN LUQUILLO NATIONAL FOREST

Commodities

Commodity Importance
Iron Tertiary
Copper Tertiary
Gold Tertiary
Silver Tertiary

Comments on the commodity information

  • PYRRHOTITE PREDOMINANT SULFIDE

Materials information

Materials Type of material
Chalcopyrite Ore
Pyrite Ore
Diopside Gangue
Garnet Gangue
Quartz Gangue
Wollastonite Gangue
Pyrrhotite Unknown

Alteration

  • (Local) Mainly Silicification In Tuffs;Limestones Of Garnet,Clinozoisite,Wollastonite

Analytical data

Result ASSAYS .2-.5% CU

Mineral occurrence model information

Model code 59
USGS model code 18b
Deposit model name Skarn Cu
Mark3 model number 8

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Stratigraphic age (youngest) Early Cretaceous
    Stratigraphic age (youngest) Early Cretaceous
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate
    Rock unit name Tabonuco Formation
    Rock description Tabonuco Formation

Nearby scientific data

(1) -65.80945, 18.26177
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Granodiorite Intruded Along A North-East Trending Anticlinal Axis
Type of structure Local
Structure description Northwest Trending Regional Faults

Ore body information

  • General form TABULAR
    Plunge direction NORTH
    Length 914.4M
    Width 30.48M
    Depth to top 0M
    Depth to bottom 60.96M

Comments on the geologic information

  • AT LA MINA, LIMESTONE ALONG THE SOUTH CONTACT OF A QUARTZ DIORITIC INTRUSIVE HAS BEEN METAMORPHOSED TO A CALC-SILICATE ROCK. PYRRHOTITE IS THE PRINCIPAL SULFIDE AND OCCURS IN THE INTRUSIVE ROCK AS WELL AS IN ASSOCIATED VOLCANIC ROCKS AND THE ALTERED LIMESTONE. LOCALLY, CONSIDERABLE CHALCOPYRITE IS PRESENT IN THE LIMESTONE NEAR THE BORDER OF THE INTRUSIVE MASS, AND PYRRHOTITE IS LESS COMMON. POTASSIUM FELDSPAR VEINS WERE ALSO OBSERVED. (PEASE, 1966, P. 110.)

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1958
Discoverer Caguas Copper Company

Comments on the reserve resource information

  • AT LA MINA, ECONOMICALLY IMPORTANT AMOUNTS OF GOLD AND SILVER OCCUR IN THE COPPER-RICH ZONES (PEASE, 1966, P. 110). EVEN THOUGH THE CHANCES THAT THE RIO BLANCO DEPOSIT WILL PROVE RICHER AND MORE EXTENSIVE THAN THE OTHER COPPER PROSPECTS IN PORTO RICO ARE NOT VERY GREAT, IT DESERVES A CAREFUL FIELD STUDY TO EVALUATE ITS POSSIBILITIES (MEYERHOFF, 1931, P. 316).

Comments on development

  • MINERAL OCCURRENCE ; ECON.COM: CRAGO BELIEVES THERE IS 1 MILLION TONS OF ORE IN THE JUNCOS-TORRES DISTRICT. GRADE IS THOUGHT TO BE 49% FE2O3.

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

    BERGEY, W.R.,1960, REPORT ON LA MINA PROJECT, CAGUAS COPPER COMPANY, INC., COMMONWEALTH OF PUERTO RICO, AD.FRAZIER PRIVATE REPORT ON FILE WITH THE DEPT. OF NATURAL RESOURCES, PUERTO RICO.

  • Deposit

    BERGEY, W.R.,1958, REPORT ON THE MINERAL DEPOSITS OF LUQUILLO AREA, CAGUAS CONCESSION, PUERTO RICO; A PRIVATE REPORT AT THE DEPT. OF NATURAL RESOURCES, SAN JUAN, PUERTO RICO.

  • Deposit

    CRAGO, WILLIAM H.,1945, REPORT ON IRON ORE DEPOSITS IN PUERTO RICO FOR PUERTO RICO DEVELOPMENT CO.; DEPT. OF NATURAL RESOURCES, PUERTO RICO.

  • Deposit

    PEASE, M. H., JR., 1966, SOME CHARACTERISTICS OF COPPER MINERALIZATION IN PUERTO RICO, IN CARIBBEAN GEOL. CONF., 3D, KINGSTON, JAMAICA, 1962, TRANS.: JAMAICA GEOLOGICAL SURVEY PUB. 95, P. 107-112.

  • Deposit

    MEYERHOFF, H. A., 1931, THE GEOLOGY OF THE FAJARDO DISTRICT, PORTO RICO: NEW YORK ACAD. SCI., SCI. SURVEY OF PORTO RICO AND THE VIRGIN ISLANDS, V. 2, PT. 3, P. 201-360.

  • Deposit

    COX, D. P., MARVIN, R. F., M'GONIGLE, J. W., MCINTYRE, D. H., AND ROGERS, C. L., 1977, POTASSIUM-ARGON GEOCHRONOLGY OF SOME METAMORPHIC, IGNEOUS, AND HYDROTHERMAL EVENTS IN PUERTO RICO AND THE VIRGIN ISLANDS: U.S. GEOLOGICAL SURVEY JOUR. RESEARCH, VOL. 5, NO. 6, P. 689-703.

General comments

Subject category Comment text
Deposit DEPOSITS OCCUR ALONG A BROAD ANTICLINAL FLEXURE WITH ITS AXIS PLUNGING TO THE NORTH.
Deposit KNOWN OCCURRENCES OF MINERAL DEPOSITS; PRESENCE OF STRONG AEROMAGNETIC ANOMALY(500 GAMMAS). [PREVIOUS UPDATERS: BAWIEC, WALTER J., 90 07, USGS; SCHELLEKENS, J.H., 91 07, UPR.] ; 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-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.

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