Keene Engineering has been providing quality mining equipment to the public for over 50 years. Family owned and operated for half a century, we are proudly the world's largest manufacturer of portable mining equipment.. Dredges,Power & Dredge Sluices,Dry Washers,Diving Equipment,Recovery Equipement,Engines & Pumps,Jet Flares,Jets,Flotation,Winches,Gold Pans,Sieves & Hand Sluices,Prospecting Tools,Rock Crushers,Books,Videos