Application of the fuzzy method in selecting the applied blocks of cobalt-rich crust

In order to selecting the best applied blocks of cobalt-rich crust, the fuzzy method was used. The average thick, the average percent of cobalt, the ore field area, the average slope, the average water depth and the number of valid stations were selected as the indexes for deciding the quality of the applied blocks of cobalt-rich crust, and the quality of the applied blocks of cobalt-rich crust was divided into three classes, and the fuzzy evaluation model was setting, then an instance was done. The result could be fundamental for selecting the best applied blocks of cobalt-rich crust. The fuzzy evaluation results were inconsistent with the resource quantities for some applied blocks of cobalt-rich crust, so both of them should be considered when the applied blocks of cobalt-rich crust were selected.The result would benefit the selection of the applied blocks of cobalt-rich crust in the future.