A professional who tends equipment that separates gold or silver from ground ore by mercury amalgamation process, using either of following methods. Respnsibilities include:

• (1) Turns valves or opens gates to regulate flow of ore and water over mercury-coated plates.
• Adjusts angle of plates to facilitate collection of amalgam.
• Scrapes accumulated amalgam from plates and coats plates with mercury.
• (2) Turns valves or opens gates to charge ground ore and mercury into rotating-type barrels or agitating-type tanks.
• Starts equipment and observes accumulation of amalgam.
• Discharges or drains barrel or tank to recover gold or silver amalgam.