RC Grade Control Drilling (in-pit grade control) is used in open cut mines to define ore grades and also provide knowledge for mine planning and blasting.

RC/GC is typical drilled to optimal depths of 48 meters using hole Ø 125-140mm.

This information is critical to reduce waste rock (dilution) in concentrator feed as dilution can vary greatly. RC grade control is the most cost effective and accurate way to define boundaries between waste rock and ore bodies.