Two Pennsylvania environmental groups scored a legal victory in an ongoing challenge to the expansion of the Bailey Mine Complex, the largest underground coal mine in the U.S.

The state Environmental Hearing Board (EHB) sided with the Center for Coalfield Justice and the Pennsylvania chapter of the Sierra Club Tuesday, overturning a permit revision granted to coal company Consol by state environmental regulators in 2015.

The groups argued the state Department of Environmental Protection essentially gave Consol a pass to cause extensive damage to Polen Run, a stream flowing into Ryerson Station State Park in Greene County. The EHB agreed, and found it violated the Pennsylvania Clean Streams Law and Article I, Section 27 of the Pennsylvania Constitution, known as the the environmental rights amendment.

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