Results of a restudy of superior polished specimens of representative nickel-cobalt-silver ores from Cobalt and South Lorraine, Ontario, are presented in seventeen paragenetic diagrams. Typical textures such as tubercle texture, rhythmic banding and dendritic texture are described and are interpreted as replacement textures developed through the diffusion of mineralizing solutions of changing compositions through highly calcitized wall rocks.The unusual characters of irregular veinlets of silver that traverse some of the arsenides in all directions are interpreted as indicating that they are fillings of ruptures produced by hydraulic pressures within the mineralizing solutions and potentially operative in all directions.The late stages of mineralization were characterized by extensive and varied replacements of early ore minerals by later ones. Silver was the mineral most abundantly replaced and calcite the principal replacing mineral. Thus the closing episode of the mineralization reversed the order of the initial phase in which silver abundantly replaced calcitized wall rocks.

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