Most preserved massive sulphide ores have undergone regional metamorphism and attendant deformation, and do, in consequence, express various degrees of remobilization. Particularly in high-grade metamorphic environments, deformation produces elongation effects, chaotic folding and foliation development, together with flowage structures and ductile injections of sulphides. Many such structures are, however, the product of deformational events concurrent with the waning portion of the metamorphic cycle. This is commonly indicated by an intense retrograde schistosity in wallrocks adjacent to piercement sulphide bodies. Irrespective of whether deformation accompanies prograde or retrograde metamorphism, there is evidence that most mechanical remobilization is fluid-facilitated. On the microscale, equidimensional, coarse-grained, annealed sulphide fabrics are characteristic. The annealed texture is commonly retextured by later events which result in preferred orientations, kinking and related evidence of crystal-plastic behaviour. In massive sulphide deposits an appreciation of the rheological contrast between most sulphides, altered silicate host rocks, and unaltered host rocks, will enable the mine geologist to see through deformation effects and recognize gross relationships characteristic of a submarine exhalative genesis. Recognition of such gross relationships is opposed to the concept of grossly discordant remobilization; maximum relative movements are usually in the order of 100 m, although transgressive remobilization in the order of 1000 m has been recognized. Metamorphism promotes chemical redistribution of components along local chemical gradients. This can result in migration of components across the wallrock/ore interface. There is substantial support for metahydrothermal redistribution, into veins, of certain components of an orebody undergoing high-grade metamorphism. There is some support for the formation of sulphide neomagmas and sulphide-silicate pegmatitic magmas, but the evidence is equivocal and remains contentious. Most chemical remobilization is on a scale of tens of metres, but it is also possible over considerably greater distances. In the Broken Hill area, Australia, chemical remobilization by hydrothermal processes accompanying regional metamorphism, has occurred over distances of kilometres and has formed new economic deposits.