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The island of Hispaniola, shared by the Dominican Republic and the Republic of Haiti, is located near the central portion of the Greater Antilles. The island, composed geologically of regional metamorphic rocks, sedimentary rocks of Cretaceous to Recent in age, and various kinds of igneous rocks, is well featured by both folds and faults of NW to WNW trends.<BR>Copper ore deposits so far known on the island are grouped into following three types:<BR>1) Chalcopyrite (or chalcocite)-quartz veins, mostly found both in Upper Cretaceous pyroclastics and regional metamorphics immediately adjacent to a quartz-diorite batholith, and very rarely in porphyry or along a contact between quartz-diorite and metamorphics.<BR>2) Contact metasomatic deposits, accompanied in parts by calcite-garnet-epidote-tremolite-wollastonite skarn, in Eocene limestone intruded by quartz-diorite dikes.<BR>3) Disseminated ore deposits (porphyry copper type) in a porphyry mass intruding Upper Cretaceous pyroclastics.<BR>Almost all those mineralizations are believed to have occurred during the Laramide Orogeny in close association with igneous activities of quartz-diorite and porphyry mentioned above.
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