A professional who controls grinding mills, kettles, and conveyors to grind and dehydrate gypsum rock and transfer gypsum to storage bins or pulverizing machine. Respnsibilities include:

• Opens storage bin gates to admit rock into grinding mill and starts mill.
• Feels ground rock to determine consistency and adjusts mill as required to obtain specified consistency.
• Opens chute to allow ground rock to flow into kettle.
• Lights fire under kettle.
• Reads temperature gauge and regulates fuel feed valve to maintain specified temperature inside kettle.
• Collects sample of calcined gypsum for laboratory analysis.
• Opens chute after specified time and turns air valve to force calcined gypsum into hot pits for cooling.
• Starts bucket elevators and conveyors to move gypsum from pits to storage bins or to ball mill for pulverizing.
• May operate rotary drier to dry gypsum rock before calcination.