Rix's Creek coal mine in the Hunter Valley. Picture supplied

The Environmental Protection Agency has fined the Rix's Creek coal mine's operator over an illegal dump of groundwater from old underground workings at its Singleton mine.

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The environmental watchdog said high-salinity groundwater, which seeps into underground mine workings or is extracted to allow for mining operations, was discharged from an uncapped bore at the Hunter Valley mine in June.

The water spilled into a nearby dam, and from there flowed into Stonequarry Gully and into a tributary of the Hunter River.

The EPA

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