Description
Kennecott Copper Corp.
Commodities
PrimaryCopper, Gold
Commodity typeM
Deposit
Model78: Porphyry Cu-Au
Deposit sizeN
Ore controlChalcopyrite Is More Commonly Disseminated Than Veinlet Controlled
Materials
Ore mineralsChalcopyrite, Magnetite, Pyrite
Geology
Host rockTonalite
Associated rockTonalite
StructureThe Mineralized Pluton Is In An Elongate Cluster Of Stocks Aligned Perpendicular To The Regional Grain Of The Island.
Tectonic settingGold-Rich Porphyry System In Low-Potassium Island-Arc Environment
AlterationThree 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
Economic & production
Development statusOccurrence
Discovery year1958
Identification
Deposit ID10085423
MRDS IDW701014
RegionCR
Data scoreC
Coordinates18.25899, -66.79086
References
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.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.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.