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