Cleaning up (48 – 60 in.) wide coal conveyor belts once considered large have evolved to 1830 – 2440 mm (72 – 96 in.) wide. Suspended magnets have increased in size and magnetic field strength accordingly. l l l l l Cleaning up Daniel Norrgran and Jaisen N. Kohmuench, Eriez, US, detail advancements in coal preparation equipment.