The Romero Cu-Au-Zn Deposits, Cordillera Central, Dominican Republic: Preliminary Data on the Mineralogy and Geochemistry of Mineralization

The recently discovered Romero deposits, hosted by the Cretaceous Tireo Formation in the Dominican Cordillera Central, has indicated resources of 2.4 M oz. gold. Here we present data on the mineralogy and geochemistry of these deposits for the first time. Gold-Cu-Zn mineralization is divided into: 1) an upper domain with disseminated sulfide mineralization in spatial correlation with a 20m thick anhydrite nodule-hosting volcanogenic unit; and 2) a lower domain with conspicuous high-grade stockwork mineralization. Centimeter-scale veins show open space fillings with chalcopyrite (+/- electrum) and less abundant pyrite and sphalerite. Preliminary sulfur isotope data on sulfides is consistent with a magmatic origin for the sulfur. Further work is needed for a proper understanding of the Romero deposits.