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ABSTRACT
The increased volume of wastes that can be stored in a given impoundment is one of the most significant potential advantages of the co-disposal of coarse and fine mine wastes by combined pumping. This volume is determined largely by the porosity of the co-disposed wastes. The porosities attained immediately following down-slope deposition of co-disposed wastes on twenty trial and full scale beaches at coalmines in Queensland and New South Wales, Australia, are generally comparable to those of both natural sediments and coarse coal wastes. A method is presented of predicting the initial porosities of co-disposed coalmine wastes that is based on parameters commonly used to describe the wastes. The initial porosities of the wastes may be reduced significantly by consolidation under superimposed loads, and collapse settlements maybe triggered by saturation of the wastes. The reduction in porosity can be predicted by means of conventional geotechnical consolidation tests.