The use of a grade control system is essential to enable better selectivity to optimize grade above cut-off, minimize waste/low-grade rock dilution, and maximize mining recovery. This can be achieved by following the rules of an effective and efficient grade control program, There are: 1. High precision modelling system. 2. Clear and accurate geological mapping. 3. Effective definition of ore and waste base on block models and grade control samples. 4. Strict supervision of stockpile management. 5. Evaluated the models and design of stope by conducted reconciliation.