A program of soil and stream sediment sampling was conducted along the Dawesley - Bremer Catchment to determine the extent and magnitude of potential heavy metal contamination downstream from the Brukunga Pyrite Mine. Arsenic, cadmium, copper and zinc were found to be consistently elevated above ANZECC'92 investigation levels, and require further detailed study. Antimony, lead, nickel and tin were also found to be occasionally elevated above investigation levels. The distribution of metals in soils throughout the Dawesley - Bremer catchment has shown that the majority of heavy metal contamination is confined to the top 20 cm of the soil profile. The only exception to this distribution is in the region between the Aclare Mine and the junction of Mount Barker Creek and the Bremer River, where soil contamination was found to the maximum depth of sampling (1.0 m). At this site, mixing of the acidic, contaminated mine drainage water with naturally alkaline water of the Mount Barker Creek has precipitated metals at high levels (up to 42 ppm Cd and 5000 ppm Zn). However, heavy metal concentrations in soils quickly drop to background values downstream from this site. Sporadic Cd values, warranting further investigation, occur along the Bremer River south of Callington. These are interpreted to be related to floods transporting sediment from contaminated sites further upstream. Slightly elevated metal levels (As, Ag, Cd, and Sb) were also found in the vicinity of the mineralised Angas Garnet Member at one site (B19). Other metals (As, Pb, and Cu) are found at naturally higher levels within soils developed over pyritic schists, which are commonly found in the area. Cu and Pb are not elevated to levels significant enough to pose a risk to human or livestock health, but As is highly elevated in some sites and bioavailability of As in these areas should be investigated. It is recommended that infill sampling of the contaminated areas be undertaken to determine the exact nature and distribution of heavy metal contamination. In addition, vegetation and water samples should be collected from the infill sites and the previously sampled areas to determine the potential translocation of the metals into the food chain.