Allmineral has specialised in machines for sorting harmful impurities from sand and gravel. Those impurities usually consist of wood- and coalparticles but Allmineral also has lots of experience in fields like gold, iron-ore, coal etc.
The Alljig is a very reliable machine for deligniting gravel up to 64 mm. Even coalparticles with a high specific gravity can be washed out. The machines are available in various types with capacities up to 250 tons/hour.