House Natural Resources Committee Chairman Doc Hastings (R-Wash.) will again blast the Obama administration Friday over planned regulations aimed at curbing environmental damage from Appalachian coal mining.

Hastings is briefing reporters Friday afternoon on his investigation into the regulations, which haven’t been proposed yet.

Hastings and committee Republicans have spent a year probing the Interior Department’s plans to rework coal-mining rules issued at the end of the George W. Bush administration.

The Bush-era rules restrict the dumping of debris from mountaintop-removal coal mining into nearby waterways.

Republicans argue the Obama administration’s planned rules could cost jobs and burden the coal industry. But environmental groups and others say the Bush-era regulation, known as the Stream Buffer Zone Rule, does not adequately protect streams and other waterways from mountaintop-removal mining.