STUDY ON CUTOFF GRADE IN A FOREIGN UNDERGROUND COPPER MINE

Use maximum net present value as an optimum target with consideration of t他twophase factors mining and milling,a dynamic optimum method for optimizing cutoff grade of underground mine deposit is given.Base on this,Offer the idea of total and part of the mine optimization consider of the grade distribution and mining methods,then implement it by computer software system.The result can instruct mine's long,mid and short term plan and production.