Where the gap opens
Reconciliation compares grade and metal across four stages: the reserve model, the ore-control model, delivered to mill, and received at mill. Over-optimistic models, poor selectivity, and unplanned dilution open the gap, and each stage carries a direct dollar value.
Measure the mine-call factor
The factors track it: F1 for orebody knowledge and selectivity, F2 for dilution and ore loss into the mill, and the mine-call factor F3 for how much reserve metal you actually recover. A persistent F3 below one is leaking revenue. The framework is set out by bodies like AusIMM.
Where the ERP closes the loop
On Hudace, grade-control assays, weighbridge and conveyor tonnage, and mill metallurgical accounting feed one system, so the factors compute continuously instead of in a monthly spreadsheet. Xenon AI shows where dilution or ore loss concentrates, by bench, blast, or shift, and flags drift.
A geologist or metallurgist investigates and signs off. AI does not re-classify reserves.
The numbers to watch
Reconcile the chain, do not average it away.
Mine-call factor (F3)
Received-at-mill metal / reserve metal depleted. How much you actually recover.
F1 factor
Ore-control metal / reserve metal. Orebody knowledge and selectivity.
F2 factor
Received / delivered metal. Unplanned dilution and ore loss into the stream.
Grade variance
Modelled vs delivered grade. Where the reconciliation gap concentrates.
See live reconciliation on Hudace
Talk to our team about computing the mine-call factor continuously.