Navigate to KPIs in the Analysis menu and click Add/Configuration.
	Select the KPI Value Calculation Method as Weighted Average
	Click the Link KPI button to be presented with a field where you can select the KPI to link. This KPI will be used as the weight in the weighted average calculation.

A Weighted KPI can be used to achieve the following:

I.e Calculating a Head grade KPI (measured in grams of metal per tonne of ore), where:

• The daily value is = (grams metal contained for the day)/(tonnes mined for the day); and

• The weekly value is = (grams metal contained for the week)/(tonnes mined for the week); and

• The monthly value is = (grams metal contained for the month)/(tonnes mined for the month)

• In some cases, the KPI will be uploaded as the daily head grade value, but we need the weekly and monthly values to be weighted by the daily tonnes mined (in Excel you’d use SUMPRODUCT(grade,tonnes_mined)/SUM(tonnes_mined) – which is where the reference to weighted averages comes from

Other key examples are recoveries (% metal recovered by the process) and any throughput/rate KPI (tonnes milled per hour, dig rate, etc.). These KPIs all need the correct weighted average values to be reported to match existing site reporting (which itself is important as otherwise we risk calculating the incorrect grade for the month and thus the incorrect value of tonnes mined when using the monthly values).

The calculation applied is SUM([KPI] * [WeightedKPI]) / SUM([WeightedKPI])