Talk by Professor Carl E. Nelson, consulting economic geologist.

Title: Genetic Models for the Pueblo Viejo Au-Ag-Cu-Zn district, Dominican Republic.

Lecturer: Carl Nelson.

Date: Monday Novembre the 3^st 2014, 13hs.

Place: Room 2.

Abstract: The origin of the Pueblo Viejo deposit has long been a subject of debate. Published models refer to Pueblo Viejo as a Tertiary porphyry copper deposit (Hollister, 1978), a Cretaceous epithermal deposit (Kesler et al., 1981), a Cretaceous maar-diatreme (Sillitoe and Bonham, 1984; Russell and Kesler, 1991); a Cretaceous high sulfidation deposit (Sillitoe et al., 1996), a Cretaceous volcanic dome field (Nelson, 2000a); and a Tertiary porphyry copper lithocap (Sillitoe et al., 2006).  A link to VMS deposits is supported by the presence in the Moore pit of massive sulfide layers adjacent to a baked intrusive contact with a dacite volcanic dome (Nelson, 2000b). Surrounding mineral occurrences include both traditional bimodal mafic massive sulfide deposits and epithermal deposits with high sulfidation mineral assemblages similar to Pueblo Viejo (Nelson, 2000). Pueblo Viejo is perhaps best described as a hybrid deposit, with both epithermal and VMS characteristics, in effect, a submarine volcanogenic massive sulfide that formed at shallow depth.