Education: Secondary (high) school graduation certificate. Tasks: Determine depth and diameter of blast holes. Direct explosive trucks to load holes. Drive and operate tracked or truck-mounted rotary drilling to bore large blast holes to specified depths at staked positions in open-pit mine or quarry. Load explosives in blast holes by hand. Read instructions or diagrams and lay out drill patterns. Operate tracked or truck-mounted drill equipped with auger or other attachment to drill holes for building foundations or pilings. Connect electrical wires, detonating cords or fuses into series and connect series to blasting machines; press handle or button to detonate charges. Measure location and stake out pattern of holes to be drilled, load blast holes with explosives and detonate explosives to dislodge coal, ore or rock. Operate air-track, rotary, down-the-hole or other drilling machines to drill blast holes or may direct drilling of blast holes. Handle, store and transport explosives and accessories in accordance with regulations and ensure that safety procedures are observed. Drive and operate air-track or other drilling machines to bore large blast holes to specified depths at staked positions in open-pit mine or quarry. Operate drilling machines to drill blast holes in rock at road or other construction sites. Assemble or direct other workers to assemble primer charges using selected detonators, fuses, detonating cords and other materials. Experience: 2 years to less than 3 years.