Underground, Geodrill provides mineral exploration and grade control drilling using a fleet of LM 90 drill rigs. The LM 90 modular diamond drill rig features easily interchangeable components, allowing for space constraints without sacrificing depth requirements. The standard modular design includes a mobile platform in order to service larger underground mines, making movement between drill sites efficient.

Underground diamond drilling aims to effectively delineate and sample underground mineral resources at various scales and stages whilst providing advanced information from which mine designs and excavation strategies can be developed. Diamond drilling (DD) aims to test multiple domains within the established mineral resource at wide and close-spacings.