Design improvements in box dredges to enhance the collection of manganese nodules

Abstract

Design of three box dredges along with the technique and modifications effected to anable bulk sampling of manganese nodules is presented. Incorporation of a sled, angled cutting edges, retention plates and increased size of the dredge resulted in significant increase of the dredge haul. Consequent field data is included. Design of a simple feeding concept to enhance the concentration of nodules at the dredge mouth is briefly dealt with for future application.