Rock salt is necessary as it is the most efficient and economical way to eliminate the ice. This is true of the roads as well as our driveways and sidewalks. However, when we can, we need to be ...

Nowadays, some of those rock salt deposits can be found at a depth of about 330ft (100m), while others are much deeper - well over a mile ... about 3,610 ft (1,100m) deep and lead to hundreds ...