A professional who controls mixing machine and auxiliary equipment to blend ingredients for explosives, such as dynamite, smokeless powder, and solid-propellant rocket fuel. Respnsibilities include:

• Weighs out and charges specified quantities of solid materials into mixer, or feeds preweighed materials into mixing chamber.
• Meters prescribed quantities of liquid chemical agents, such as nitroglycerin, wetting agents, catalysts, or solvents into machine.
• Starts mixer to blend ingredients for specified time or until prescribed reaction occurs.
• Tilts mixer to discharge contents, moves dump lever, or shovels materials into containers for storage, shipment, or further processing.
• May compute quantities of chemical agents required for batch of given size, according to formula.
• May tend auxiliary equipment units, such as dissolving tanks, oven, or vibrating screens, to prepare or further process materials before or after mixing.
• When blending ingredients for pyrotechnic tracer shells, is designated Composition Mixer.
• When mixing nitroglycerin and dry ingredients to produce dynamite, regulating mixer speed and ingredients according to grade and type of dynamite specified, is designated Dope Mixer.