John Doyle has worked principally in the Southern Coalfield as a geologist within the BHP operations. He has extensive experience in underground and exploration geology. In recent years his work has led him to develop techniques and competencies relating to the placement of instrumentation in deep exploration boreholes. Concurrently he has developed skills in the grout closure of exploration boreholes, particularly those bores with instrumentation. John was employed for the majority of his professional life by BHP but in more recent years he is a Director of Geosensing Solutions and now provides geological, instrumentation and grouting services to the mining companies of the Southern Coalfield.