Coal-mining productivity in - SAIMMin the form of tonnes per man year as a means of com n. The .. methods, namely surface mining and longwall underground mining, are .. The average output per employee in the ... but they still cut coal for only 20 to 40% of a shift. The short-.output per man shift in mining,Performance Measurement of OC Mines Using VRS Method - IJETTNov 5, 2014 . in coal mines all over the world is being measured in terms of output per man shift (OMS). Thus, productivity. (OMS) in underground mines is.
output per man shift in mining