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Interesting article link below, it gives a new approach on how to measure assets productivity. I think is more "real" than OEE. For commutation normally I would use a logic where OEE = (availability or run-time) * (Avg TPD/max TPD) * (recovery %). This might bring new decision models on "what to do" in order to maximize in a better way. How does it apply to grinding mills?
http://www.mckinsey.com/insights/energy_resources_materials/productivity_in_mining_operations_reversing_the_downward_trend