A conservation group has launched an appeal into a NSW court decision that's allowing a coal mine to release contaminated water into Sydney's drinking catchment. A court decision earlier this year allowed the Springvale mine west of Sydney to continue to pump waste water into a river that flows through the heritage-listed Blue Mountains. There's a plan to send the water to a nearby power plant for cooling, but environmentalists say overflows can still find their way into rivers that feed Sydney's water supply.