| Deposit ID | 10085468 |
|---|---|
| MRDS ID | W701059 |
| Record type | Site |
| Current site name | Helecho Deposit |
| Geographic coordinates: | -66.79947, 18.24455 (WGS84) |
|---|---|
| Relative position | ALONG THE RIO COABEY 1 KM SOUTH OF THE TANAMA DEPOSIT |
Political divisions (FIPS codes)
Utuado Municipio(county)
Puerto Rico(state)
United States(country)
North America(continent)
Land(continent)
USGS map quadrangles
Monte Guilarte(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)
| Country | State |
|---|---|
| United States | Puerto Rico |
| Commodity | Importance |
|---|---|
| Copper | Primary |
| Gold | Primary |
| Silver | Primary |
| Materials | Type of material |
|---|---|
| Chalcopyrite | Ore |
| Anhydrite | Gangue |
| Magnetite | Unknown |
| Pyrite | Unknown |
| Model code | 78 |
|---|---|
| USGS model code | 20c |
| Deposit model name | Porphyry Cu-Au |
| Mark3 model number | 34 |
| Host or associated | Associated | ||||
|---|---|---|---|---|---|
| Rock type | Plutonic Rock > Granitoid > Tonalite | ||||
| |||||
| Host or associated | Host |
|---|---|
| Rock type | Volcanic Rock (Aphanitic) > Felsic Volcanic Rock |
| Host or associated | Host |
|---|---|
| Rock type | Volcanic Rock (Aphanitic) > Mafic Volcanic Rock > Basalt |
| (1) | -66.79947, 18.24455 |
|---|
| Type of structure | Regional |
|---|---|
| Structure description | Pluton Is In Elongate Cluster Of Stocks Aligned Perpendicular To The Regional Grain Of The Island. Fractures Striking N.18 W. And N.2 E. In The Helecho Porphyry Match Mineralized Fractures In The Tanama Deposit. The N.30 E.-Striking Fractures Match The Trend Of The Elongate Cluster Of Stocks Of Which Helecho And Tanama Are A Part. |
| Type of structure | Local |
| Structure description | Veins And Mineralized Fractures Show Difference In Orientation Between The Porphyry And Metavolcanic Country Rocks. N.30 E.-Striking Fractures Predominate In The Volcanic Rocks But Are Rare In The Porphyry. |
| Development status | Occurrence |
|---|---|
| Commodity type | Metallic |
| Deposit size | Medium |
| Significant | No |
| Discovery year | 1958 |
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| USGS | Mineral Resources Data System | MRDS | W701059 |
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.
BARABAS, A. H., AND QUINN, E. J., 1980, ALTERATION, MINERALIZATION, AND FLUID INCLUSIONS IN THE HELECHO PORPHYRY COPPER PROSPECT, WEST CENTRAL PUERTO RICO [ABST.]: 9TH CARIBBEAN GEOL. CONF. SANTO DOMINGO TRANS., P. 2-3.
| Subject category | Comment text |
|---|---|
| Deposit | DEPOSIT IS SIMILAR TO THE TANAMA DEPOSIT, AND IS COEXTENSIVE WITH A TONALITE PORPHYRY STOCK. MOST OF DEPOSIT IS MANTLED BY A THICK SAPROLITE LAYER, BUT IS WELL EXPOSED IN THE RIVER. COPPER ORE GENERALLY CONFINED TO PORPHYRY PLUTON NOT ASSOCIATED WITH SPECIFIC ALTERATION ASSEMBLAGE. |
| Deposit | [PREVIOUS UPDATERS: BAWIEC, WALTER J., 90 08, USGS; SCHELLEKENS, J.H., 91 07, UPR.] |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 01-JAN-1990 | Paidakovich, Matthew E. | U.S. Geological Survey | |
| Updater | 01-AUG-1991 | Paidakovich, Matthew E. | U.S. Geological Survey |
Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.