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