In {TAIL ~ a preferred embodiment}, {HEAD ~ a comparison} between the current pit volume and the previous recorded pit volume may be graphically displayed to the drilling operator in real time 
In { TAIL ~ a preferred embodiment } , { HEAD ~ a comparison } between the current pit volume and the previous recorded pit volume may be graphically displayed to the drilling operator in real time
REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH