Amol Lanke and Hadi Hoseinie and Behzad Ghodrati, Mine Production Index (MPI): New Method to Evaluate Effectiveness of Mining Machinery. journal = {International Journal of Geological and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology. November 2014, vol. 95(11). 755 - 759 [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/9999723.