Working in Salt Mining..

A salt mine is an operation involved in the extraction of salt
from rock salt or halite, a type of evaporitic deposit. Areas
known for their salt mines include Kilroot near Carrickfergus,
Northern Ireland (over 100 years old and more than 25 km of passages),
Khewra in Pakistan, Tuzla in Bosnia, Wieliczka and Bochnia in Poland,
Hallstatt and Salzkammergut in Austria, Rheinberg in Germany,
Slănic in Romania, Provadiya in Bulgaria, Avery Island in
Louisiana, United States, the wich towns of Cheshire and Worcestershire
in England, and the Detroit Salt Company's 1,500-acre (10 km2)
subterranean complex 1,100 feet (340 m) beneath the city of Detroit.
The Sifto Salt Mine in Goderich, Ontario, Canada is one of
the largest salt mines in the world. It measures 1.5 miles (2.4 km)
wide and 2 miles (3.2 km) long.