Includes driving of wells and pumping.

Code 4568 applies to employers engaged in the production or refining of borax, potash or salt.  The raw materials such as salt ores, amines, caustic soda and soda ash are received from others.  Raw brines also may be received from others or the brines may be pumped from salt wells or lakes by the employer.  This classification includes the driving of wells and the pumping of the raw brines.  Raw brines are partially evaporated and salt ores are dissolved in water to produce a brine of the desired concentration for processing.