IMA on-line Fast Conveyor Analyzer (FCA) is used in sensing coarse primary crushed and/or fine crushed ore before it enters the grinding mills and concentrator. The role of the FCA is to fast track the ore grade and type for optimum processing by delivering immediate feedback of ore grade to loaders at the muck pile. The information is also fed forward for process optimization few hours before the ore enters mills and concentrator. Loading wrong ore type or waste rock is thus avoided, and ore blending is optimized, and different minerals can be treated with optimum and sustainable way. This reduces waste rock dilution and increases mill through put and metal recovery in the concentrator. Further ore losses can be reduced by more accurate reactive loading. All this improves mine economy and reduces mining costs.