Identification of dykes using measure while drill data

Dykes in the Pilbara region of Western Australia were identified using blast hole measure while drill (MWD) data. This allowed researchers to accurately model the thickness and orientation of dykes in active mining pits, which would otherwise require interpretation from exploration drill holes and pit wall mapping. The findings indicate that geologists can use MWD data to model structural features in mining pits, which in turn has implications for grade control, mine scheduling and geotechnical engineering. MWD data were obtained using automated blast hole rotary drill rigs with holes spaced between five to nine metres apart. Parameters analysed included rate of penetration, torque, rotary speed, weight on bit and air pressure. Dyke interpretations were validated using high resolution drone scans of pit walls.