Technical data
Drill-hole correlation and comminution sizing, both computed live from published methods.
Every hole's down-hole log, projected west to east. A correlation line is drawn between two adjacent holes only when they log the identical rock unit within 25 m of depth of each other — a real, checkable rule, not an artist's impression of continuity.
Pick a rock type, a feed size and a target grind, and the calculator returns the specific grinding energy from Bond's equation directly — the same formula the industry still sizes crushers and mills against.
Method notes
The correlation panel above connects rock-unit boundaries between adjacent holes only where the boundary depths agree within 25 m — loosen that tolerance and you would see more lines, most of them spurious; tighten it and genuine correlations across our roughly 60–90 m hole spacing start to disappear. 25 m was chosen as the value that keeps both failure modes visible without favouring either.
The comminution calculator implements Bond’s equation exactly as published in 1952: W = 10 × Wi × (1/√P80 − 1/√F80). The reduction ratio (F80 ÷ P80) is also reported, since it is usually the faster sanity check on whether a feed/product pair is realistic for a single grinding stage.