Wind and splice wires at different lengths for different jobs.
Tends ball mill that grinds ore and classifier that separates coarse from fine particles: Turns pump valves and moves conveyor-control levers to feed soda ash, starch, lime, water, ore, and other materials into ball mill to make slurry. Adds chemical reagent to slurry that causes fine particles to float and enables classifier to separate fine from coarse particles and to return coarse ones to mill for regrinding. Obtains sample of slurry in bucket from mill and classifier. Weighs sample and calculates density of mixture or titrates sample to measure alkalinity. May examine ore tactually or observe its color to ascertain size of particles. May set automatic device to regulate amount of ore passing on conveyor belt to ball mill.