A professional who supervises and coordinates activities of workers engaged in maintenance and repair of mobile battery-powered mining equipment. Responsibilities include:

• Reviews list of mobile battery-powered equipment needing repairs.
• Examines defective equipment and equipment batteries to determine malfunctions, using electrical and hydraulic schematics.
• Assigns personnel to perform repairs.
• Inspects repaired equipment for conformance to company and federal safety standards.
• Notifies supervisor when equipment is back in service.
• Trains new employees.
• Tests air in mine shafts for presence of methane or lack of oxygen, using hand held testing devices, and notifies shift supervisors of hazards.
• Observes work area for defective equipment and hazardous electrical conditions, according to federal and state regulations.
• Completes accident reports.
• Performs other duties as described under supervisor master title.