Abstract Stratiform exhalative sulphide deposits are generally concordant, massive to semi-massive accumulations of sulphide (primarily iron sulphide) – sulphate minerals (barite, anhydrite) that formed on or immediately below the seafloor penecontemporaneously with their host rocks. They range in age from those that are actively forming within modern oceanic spreading ridges and back-arc basins, to those preserved in ca. 2.0 Ga sedimentary basins, and in ca. 3.4 Ga oceanic crust. Canada is particularly well endowed with classical examples of all subtypes, as well as with deposits that may be regarded as hybrid or of mixed character between the different subtypes.