Having completed his apprenticeship in Adelaide, Harrison pursued his career in the mining sector in Roxby downs where he specialized as a Maintenace mechanical leading hand in the refinery at Olympic dam.
Mark completed his Fitting and Machining Apprenticeship in Adelaide and there after returned to his hometown of Kalgoorlie, WA, where he worked for a family owned and operated company specializing in line boring and machining for mining equipment within the goldfield's region.