Since 2010/11 GRL has been operating a network of 7 dust deposition gauges, 2 high volume samplers which collect PM10 data for a 24 hour period on a 6 day rotational cycle, and 2 TEOMs which continuously monitor PM10 and PM2.5 particles in the air. PM10 and PM2.5 particles are particles which are less than 10 microns and 2.5 microns in diameter, a micron being 1 thousandth of a millimetre. The monitors have been positioned to assess existing local air quality and reflect the prevailing wind conditions.

Additional monitoring stations will be installed to verify compliance with the relevant criteria during the life of the mine.