Salt Production Process
General process information
Rock salt is mined and going through a primary crushing underground to obtain pieces smaller than about 9 inches (23 cm).
The salt is then transported outside the mine to a secondary crushing area to reduce the particle size to about 3.2 inches (8 cm).
At this point foreign matter is removed from the salt, a process known as picking.
Metal is removed by magnets and other material by hand. Rocky material may also be removed in a rotating metal drum with small holes in the bottom. Salt is dumped into the drum, breaks when it hits the bottom, and passes through the holes.
The picked salt then goes to a tertiary crushing area to produce particles about 1.0 inch (2.5 cm) in size. If smaller particles are needed, the salt is passed through a grinder. If purer salt is needed, rock salt is dissolved in water to form brine for further processing. Otherwisethe crushed or ground salt is passed through screens to sort it by size, poured into bags, and shipped to the consumer.