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Monitoring and investigation of water inflow into a coal mine in New South Wales, Australia

Abstract The Dams Safety Committee is responsible for ensuring the safety and integrity of all substantial dams and storages in New South Wales. Coal mining is currently taking place beneath the Sydney Water Board catchment where a system of five reservoirs constitute part of the urban water supply for the cities of Sydney and Wollongong. Pillar extraction of the Wongawilli seam adjacent to Avon storage resulted in an unexpected inflow of water into the mine workings. Algal analysis indicated that a proportion of this inflow may have originated from a surface source. The paper outlines the events which occurred, the monitoring initiated and the results of the investigations.