VMS potential

VMS Volcanogenic Massive Sulphide Deposits and Ni-Cu-Co Type Magmatic Massive Sulphide Deposits

Volcanic-associated massive sulphide (VMS) deposits occur throughout the world and throughout the geological time column in virtually every tectonic domain that has submarine volcanic rocks as an important constituent. VMS deposits are major sources of Cu and Zn and contain significant quantities of Au, Ag, Pb, Se, Cd, Bi, Sn as well as minor amounts of other metals. As a group, VMS deposits consist of massive accumulations of sulphide minerals (more than 60% sulphide minerals) which occur in lens-like or tabular bodies parallel to the volcanic stratigraphy or bedding.

http://earthsci.org/mineral/mindep/ma_sulp/ma_sulp.html