The Grizzly Feeder is suitable to feed primary jaw crushers, selecting the large sizes which require primary crushing, the smaller sizes, and any fines which must be eventually rejected. The Grizzly vibro feeder consists of a very large vibrating body made of thick plate, with inside lining of anti-abrasive plate. The Grizzly vibro feeder is driven by two or four vibrating motors. The vibro feeder which may either be placed on a steel or concrete base rest on springs.