The proposed state legislation seeks to update and streamline environmental regulation for nine Queensland mine sites - including those run by Xstrata, BHP Mitsubishi Alliance, Anglo Coal and Rio Tinto - which are currently covered by special agreement acts.

The remaining Queensland mines have been subject to the stricter requirements for a number of years.

The bill, expected to be passed in three weeks' time, includes standards relating to emission levels, air quality and pollutants.

The bill does not affect any other aspects of the special agreement acts and will not affect the right to mine.

While supportive of the proposed legislation, Xstrata has reportedly indicated to the State Government it may cost up to $100 million to meet the new environmental requirements.

If made law, the legislation will be phased in over three years.

Xstrata could not be contacted before publication.