Jochen S Rohr

US Patent:

6186336, Feb 13, 2001

Filed:

Oct 29, 1999

Appl. No.:

9/429885

Inventors:

Jochen Rohr - Orinda CA

International Classification:

B07B 100

US Classification:

209233

Abstract:

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