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