[1] The mine opened in 1910 and covers 1,500 acres (610 ha) underground.
[2] In the beginning, the leather and food industries were the primary customers.
Today, road deicing salt is the primary product.
[4] The mine was closed from 1983 to 1998, when production was restarted to produce road deicing salt.
[3] In October 2010, the Detroit Salt Co., LLC, was acquired by the Kissner Group of Canada for an undisclosed price.