The north-south trending Benagerie Ridge, lying within the South Australian portion of the Curnamona Province 120-160 km to the west-northwest of Broken Hill, contains a number of magnetic complexes, some of which can be interpreted as domal structures. The present subject Benagerie Ridge Magnetic Complex (BRMC) in particular has been the focus of intensive exploration activity over the past five years, which has included the drilling of over 1600 holes along a strike length of 40 km. The drilling has led to the discovery of a number of mineralisation styles which range in age from about 1700-1670 Ma through to Tertiary. The mineralised sequence forms an annulus around the core of the BRMC, and essentially occupies a buried interface between the lower oxidised and upper reduced parts of the Willyama Supergroup. The complex, highly faulted and deeply weathered primary mineralised zone (Cu-Au plus also Pb-Zn) has been dated at 1702+/-6 Ma, and can be subdivided into a minimum of nine units. It is up to 200 metres thick, and is composed of variably altered meta-evaporitic shale and carbonate; it can also contain massive pyrite units, iron formations, stromatolitic horizons and tuff marker beds. Crosscutting domains of invasive albitisation often destroy many of the original chemical and mineralogical features of the units, and these albitised domains tend to host the Cu-Au mineralisation.