In mining, OMS is one of the measures of efficiency for the production.

Details of OMS Calculation

(i) Calculation for UG OMS = Coal Production/ Manshift

(ii) Calculation for Open Cast OMS =  {Coal production+(1.4*OBR)} / {Manshift+(Manshift*Average Stripping Ratio*1.4)}

                                                    Coal Production of UG + Coal Production of OC

 (iii)  Overall OM                =      ------------------------------------------------------------                                              

                                                  Manshifts of UG + Adjusted Manshifts of OC



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