A professional who tests and repairs ore-crushing and ore-transporting machinery. Responsibilities include:

• Starts machines and equipment, such as feeders, jaw crushers, conveyor belts, and suction dust collectors.
• Observes machines and equipment in operation for defects and malfunctions.
• Turns valves to regulate flow of water into cooling system.
• Breaks up clogged ore, using iron bar or pneumatic hammer.
• Repairs machines and equipment, using handtools.