Where is the mine/mill changeover point? Surprisingly, it’s not always at the same place at every mining operation. The logical point for the end of the mine recording (claimed tonnage and grade) is when ore goes into the primary crusher, but in some cases the ‘mine’ stream stops at the crushed ore stockpile (the cone) and in others the mill stream starts at the ROM pad. Once this transition point is fixed and understood then a deeper understanding of ‘claimed’ and ‘actual’ ensues.
This 30 Seconds of Info is from Ian Glacken – Director of Geology: