Ore grade in primary crushed rock has been representatively measured in real time in the minerals sector in conveyed flows since early 2000s. That capability has been developed and successfully implemented in gold ores for direct gold grade measurement. This paper discusses the Prompt Gamma Neutron Activation Analysis (PGNAA) technique and its capabilities and limitations providing site data as examples. Major resource companies have installed these units to measure average gold grade for each five to ten minutes of flow with data used for ore reconciliation, metal accounting and ore blending to improve mill feed quality.