UC-355
Block Re-Estimation & Grade Reconciliation
Compares predicted against delivered metal block by block, ranks which blocks to re-estimate, and issues the pack before the next mine plan.
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The Challenge
Mines routinely deliver less metal than the block model promised, and the gap is argued over months later at quarter end. Grade control, survey and metallurgical data sit in three systems with no single owner.
How It Works
- Reads drillhole assay certificates, block models, grade control polygons and mill feed logs.
- Compares predicted tonnes, grade and metal against surveyed and milled actuals per block.
- Issues a ranked re-estimation shortlist to the resource geologist before the plan is re-cut.
What It Removes
- Manual quarter-end reconciliation spreadsheets
- Chasing assay certificates across three systems
- Re-keying survey volumes into the mine plan
Input Data RequirementsAssay certificates, block model exports, grade control polygons, survey pickups, mill feed logs, metallurgical accounting records, mine plan schedule
Output FormatRanked shortlist of blocks to re-estimate before the next mine plan, with the reconciliation factor and the variance trail behind each call
“We argue about the reconciliation factor every quarter and nobody can show where the metal actually went”