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|The Boddington Gold Mine, operated by Worsley Alumina Pty Ltd, is located about 100 km south of Perth and is one of the largest-producing gold mines in Australia.Multiple open pits are planned and several extend below the water table, through the deeply weathered lateritic profile and into the underlying Archean bedrock. Groundwater related mining problems, such as poor trafficability, wet floor conditions and slope instability began to occur early in 1990.The mine is located within Archean greenstones which are steeply dipping and faulted. Rock types include mafic to felsic volcanics, pyroclastics and sediments. These rocks have been regionally deformed and metamorphosed and are intruded by quartz micro-diorites and post-mineralisation dolerite dykes. Deep weathering has produced a typical oxide profile consisting of laterite, clay and saprolite zones underlain by weathered to fresh bedrock.|