DEA is concerned about the ongoing mining activities occurring within the Greater Sydney Water Catchment, and the effects of this mining on the water security of over 5 million people. There is increasing evidence of damage to groundwater systems that supply Sydney’s drinking water from mining operations, and this expansion proposal comes at a time when dam levels are below 50% capacity and water restrictions are in place. The Dendrobium Mine Expansion will only further these damaging impacts, placing the water supply in even more precarious territory.