This six minute video (home made by the MMS commissioning engineer!) shows the installation, commissioning and operation of an Aachen Reactor system at a large West African Gold operation. It demonstrates the extreme action of the Aachen Reactors taking the dissolved oxygen levels from 1.2 mg/L before start up of the Aachen’s to 28.7 mg/L immediately after start up. The mine indicated that after start up of the Aachen Reactors, gold recovery measurably increased whilst cyanide consumption dropped appreciably.