OBSOLETE. Enables the directed movement of heavy metal ions into, out of or within a cell, or between cells. Heavy metals are those that can form a coordination bond with a protein, as opposed to an alkali or alkaline-earth metal that can only form an ionic bond; this definition includes the following biologically relevant heavy metals: Cd, Co, Cu, Fe, Hg, Mn, Mo, Ni, V, W, Zn.