Various methods of treating oxidised copper ore remaining in the abandoned open cut mine and surrounding waste dumps at Burra have been investigated using more representative, recently gathered samples, and the results are here summarised. Ore concentrates for processing can be produced by either flotation or gravity means, but the recoveries are too low to justify the adoption of either of these methods. Both agitation and percolation leaching with sulphuric acid can achieve leaching efficiencies of 90%, with acceptable acid consumption. Since the capital cost of percolation leaching equipment is lower than that for agitation leaching equipment, the former system is preferred. Because of the small proportion of ore of a suitable size, the use of a photoelectric ore sorting machine cannot be contemplated. Leaching tests carried out with either sodium cyanide or ammoniacal solutions gave only low recoveries, so neither of these methods would be of value. Direct precipitation of copper in the leach liquor, with subsequent recovery by flotation, was shown to be feasible, but the recovery of copper and the grade of product obtained were not sufficiently high to show any advantages over conventional leaching processes. The estimated cost of a plant treating 1000 tonnes daily of ore containing 1.7% Cu is $1.3 million when using the standard leach-CCD-cementation procedure. For a plant using the leach-precipitation-flotation route, the estimated cost is $1.1 million. Operating costs are estimated to be $3.30-$3.60 per ton of ore, with a surplus of return over cost of approximately $4 per ton of ore, by either process. The break-even grade, based on direct costs alone, is 0.65% Cu.