Mines try to reduce dilution or the amount of waste rock entering the production stream in the pit. After all, tailings storage is a cost, and in some cases, an environmental liability. The object is to leave as much barren rock in the pit as possible, but working with an excavator and truck has its limitations when it comes to quality control. Once the ore for coal) reaches the plant feed, it's now the plant's responsibility to safely recover the most minerals, cost effectively.
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