NSW Attorney-General Mark Speakman is seeking advice from the Solicitor-General about the effect on controversial NSW anti-protest laws of a High Court decision that found similar laws in Tasmania were unconstitutional.

The decision could have ramifications for three protesters facing up to 14 years in jail after becoming the first people charged under laws introduced by the NSW government last year.

Bev Smiles was one of the first people charged with anti-protest laws in NSW. Credit:Ryan Osland

Bev Smiles, Stephanie Luke and Bruce Hughes were charged in April with rendering useless a road belonging to a mine and hindering the working of equipment belonging to a mine following a protest at Wilpinjong Coal Mine in the Hunter Valley.

Each charge carries a maximum sentence of seven years in jail.