A professional who tends equipment that precipitates gold or silver from cyanide solution. Respnsibilities include:

• Packs zinc shavings into compartments of zinc boxes.
• Regulates flow of solution through boxes where gold or silver precipitates on zinc.
• Shuts off flow of solution and turns on water.
• Agitates shavings to remove precipitate.
• Pulls plugs and draws off slime (precipitate and water) from boxes.
• Treats slime with sulfuric acid.
• Turns slime solution into filter press that filters solution and removes precipitate residue.
• Washes precipitate with water under pressure, and dries it with compressed air.