| Lat / long: | 18.25899, -66.79086 |
| Primary: | Copper, Gold |
| Ore: | Chalcopyrite, Magnetite, Pyrite |
| Discovery year: | 1958 |
| Operation type: | Unknown |
| Production size: | None |
| Development status: | Occurrence |
| Host type: | Tonalite |
| Associated type: | Tonalite |
| Structure: | The Mineralized Pluton Is In An Elongate Cluster Of Stocks Aligned Perpendicular To The Regional Grain Of The Island. |
| Tectonic: | Gold-Rich Porphyry System In Low-Potassium Island-Arc Environment |
| Alteration processes: | Three Alteration Zones Are Present:(1)An Inner, Amphibole-Dominated Assemblage Containing Abundant Magnetite And Of Low Copper Grade;(2)An Outer, Chlorite-Dominated Assemblage, Locally Containing Traces Of Hydrothermal Biotite And Potassium Feldspar And Abundant Chalcopyrite Replacing Magnetite; And (3)An Upper, Sericite-Clay-Calcite-Pyrite Zone |
| MRDS | W701014 |
| DEP | 10085423 |
| Reference | {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:: NELSON, A. E., AND TOBISCH, O. T., 1968, GEOLOGIC MAP OF THE BAYANEY QUADRANGLE, PUERTO RICO: U. S. GEOLOGICAL SURVEY MISC. GEOL. INV. MAP I-525.}{Deposit:: COX, DENNIS P., 1985, GEOLOGY OF THE TANAMA AND HELECHO PORPHYRY COPPER DEPOSITS AND VICINITY, PUERTO RICO: U.S. GEOLOGICAL SURVEY PROF. PAPER 1327, 59 P.} |
| Reporter | Paidakovich, Matthew E. |