The Matchless Member of the Damara Sequence is a relatively thin but laterally continuous belt of metamorphosed, subalkaline, tholeiitic, ocean-floor basalt within metapelitic schist. The Matchless Member is also the locus of a major shear zone with a southeastward movement direction. Several lines of evidence indicate that the belt is stratigraphically inverted over most of its length. There are 18 known base metal sulphide deposits, grouped into four clusters, along the length of the Matchless Belt. Although deformed and metamorphosed, these cupriferous pyrite deposits have features such as cupriferous massive sulphide mineralization, alteration haloes and associated magnetite quartzites that are used to classify them as Besshi-type volcanic-hosted massive sulphide deposits. It is argued that they formed in a regionally extensional setting rather than in the typical compressive island arc setting. The water depth at the time of their formation is estimated to have been at least 1 km.