A proposed Baird government crackdown on anti-mining protests could expose anti-CSG protesters across NSW to criminal penalties and up to seven years' jail.

It has previously been reported the government's proposed anti-mining interference bill would expand police powers to search protesters intent on attaching themselves to mining equipment, seize their materials and levy heavy fines greater than $5000 upon them.

But the bill also potentially exposes a wave of anti-coal seam gas protesters across NSW to criminal penalties and a maximum custodial sentence of seven years' jail.

The bill would amend the state's Crimes Act to extend the crime of "interfering with a mine site" - including hindering a mine's equipment - to CSG extraction and exploration sites instead of an existing focus on coal mines.