A dredge (10) includes a primary grizzly (18) with a sieve for separating dredged material initially into recoverable and discharge portions. A second or auxiliary grizzly (44) and sieve are also provided on a chute extending from the primary grizzly (18) to further remove remaining recoverable material from the portion of material discharged from the primary grizzly (18). A gate is provided for selectively opening and closing access to the auxiliary grizzly (44) depending upon the make-up of the material discharged from the top of the primary grizzly (18). The combination of the primary and auxiliary grizzly (18,44) provide for increased efficiency and effectiveness in recovering a larger percentage of recoverable material from a water-based dredging operation.