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.
| Check | Expected | Actual | Result |
|---|---|---|---|
| Bond specific energy, Wi=12.7, F80=10000um, P80=100um | 11.43 kWh/t | 11.4300 kWh/t | PASS |
| cut-off grade, $38/t mining + $22/t processing, $1950/oz @ 91% recovery | 1.0517 g/t | 1.0517 g/t | PASS |
| 1186 block model grades are finite and non-negative | 0 bad values | 0 bad values | PASS |
| tonnage at 1.5 g/t cut-off = block count x block volume x density | 10,428,000 t | 10,428,000 t | PASS |
| lithology correlation lines all connect identical rock codes | 0 mismatches, > 0 correlations | 0 mismatches, 39 correlations | PASS |
Running the browser block model against the server block model…