Mining Method Optimization of Difficult-to-Mine Complicated Orebody Using Pythagorean Fuzzy Sets and TOPSIS Method

In Suichang gold mine, the altered rock type deposits were cut by faults and joint fissures, leading to complex resource endowment characteristics, large changes in occurrence, a serious of ore vein branches great difficulty mining. order select suitable mining method for such difficult complicated orebody, multi-factor multi-index comprehensive evaluation system involving benefits, costs, safety other aspects was constructed using Pythagorean fuzzy sets TOPSIS method. Taking mine as an example, weighted aggregation matrix constructed, closeness index four schemes 0.8436, 0.3370, 0.4296 0.4334, mechanized upward horizontal layering determined optimal scheme. This overcame comparison economic technical indicators directly, but converted them into corresponding numbers obtain accurate optimization. The application this not only ensured safe, efficient environment-friendly effect, also provided reference optimization scheme severely branched composite orebody.