Underground mining is the second oldest method of producing salt, next to the solar evaporation technique. Like most mines, salt mines employ large machines to travel through vast cave-like passageways performing various functions. Unlike most mines, however, salt mines are comfortable to work in (average temperature stays around 70° F all year round) and offer a safer work environment than usual.
Salt mine in Goderich, Ontario
Deep under Lake Huron lies the largest salt mine in the world. Some 500 miners work in the mine, often cited as a massive and almost pure deposit that experts predict will be able to supply 100 years of mining. Compass Minerals is the company in charge of the mine, and if predictions are on point, the company is set for profit for many years to come.