Lyall has nearly five decades of experience, including more than three decades as a mining consultant. He specializes in blasting, slope stability, and mine engineering for coal, phosphate, copper, gold, and iron mines. He has worked with clients in the United States, Canada, Australia, South Africa, Mexico, Brazil, Chile, Zimbabwe, Turkey, Bermuda, and the Cayman Islands. Since joining Barr, Lyall has been involved with mine planning, blasting, and mine pit stability on highwalls. This work has been primarily for the open-pit mining of coal, iron, and other minerals.