A professional who operates rotary kiln in which cinnabar (mercuric sulfide ore) is volatilized to obtain free mercury. Respnsibilities include:

• Ignites oil burner and turns fuel and air pressure valves to heat kiln to specified temperature.
• Sets controls to regulate conveyor speed and rotation of kiln.
• Observes gauges and flow of ore into kiln and turns controls to maintain temperature and amount of ore in kiln.
• Lubricates and repairs kiln and equipment.