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