A prototype rock separator designed to separate rocks greater than 2.5 cm was built and tested at Nicholson Murdie Machines Limited's operation. The prototype demonstrated that a rubber-belted conveyor can be used to separate rocks from woody material when operated with a side tilt and a speed and slope that are greater than normally used to transport wood waste. Rock separation rates greater than 90% with wood loss of 29% were achieved during the field tests. Average production rates of 8.8 tonnes per hour were achieved during prototype testing.