About this Calculator
When using the calculator be sure to select the appropriate pricing units (oz. or lbs.) and the assay units (% or grams per tonne). You can calculate Eq for up to 5 precious or base metals using this calculator. Note that g/t is the same as ppm.
We’ve updated this calculator! It now factors in metallurgical recovery rates and smelter returns using industry standard calculation methods.
Results are calculated using the following formula:
MetalEq (percent) = Gpri + (Gpri × [∑i Ri Si Vi Gi ]/(Rpri Spri Vpri Gpri))
where R is the respective metallurgical metal recovery rate, S is the respective smelter return rate,
V is metal price/tonne, and G is the metal commodity grade for the suite of potentially recoverable commodities (i) relative to the primary metal (pri)