 SedEx deposits are distinctive in that it can be shown that the ore minerals were deposited in a marine second-order basin environment, related to discharge of metal-bearing brines into the seawater.This is distinct from other Pb-Zn-Ag and other deposits which are more intimately associated with intrusive or metamorphic processes or which are trapped within a rock matrix and are not exhalative.The process of ore genesis of SedEx mineralization is varied, depending on the type of ore which is deposited by sedimentary exhalative processes.