Both are simply salt. The only difference is the size of the crystals and the amount and type of trace minerals or additives that are included. Table salt usually contains iodine. Rock salt, which is very coarse, often includes an additive to prevent clumping. In most instances, table salt is evaporated out of ocean water or a brine solution.

Halite is another word for salt.

To melt ice, salt lowers the freezing point of water. When rock salt is applied properly, small amounts of salt partially melt the ice and form a brine solution. This solution flows under the ice and breaks the bond between the ice and the pavement. This enables the snow plows to remove the ice from the roads.

The salt bed that we mine is approximately 400 million years old. 

We produce over three million tons of salt a year. 

Currently, more than 225 million tons are available to mine over the decades to come. 

Sodium Chloride, NaCl, or salt, is found naturally throughout the earth, in rocks and in the sea. It is the only rock consumed by people.

Salt companies would use a well to pump out brine (salty water) from the earth, then would evaporate the water to form the salt. 

in 1998, American Rock Salt built a production shaft that reaches 1,433 feet into the earth. This is the shaft that brings our dedicated miners underground everyday to work. 

The first construction of a shaft salt mine in western New York was completed in Livingston County in 1884. Previously, all other facilities were wells sunk for evaporation of salt.

The extraction process begins with undercutting the mine walls level with the floor. A self-propelled undercutter carves a massive channel at the base of the deposit and across the entire room. This channel allows for a more efficient explosive blast and also helps create a smooth mine floor.
Once the mine wall is undercut a special drilling machine bores small holes into the face of the salt. Then miners will prime these holes with explosive materials and prepare to start blasting.
Miners ignite the explosives, creating a blast that dislodges 800 to 900 tons of rock salt in less than three seconds. The depth of the mine and cushion of the overburden absorbs the blast vibrations, preventing any surface damage to immediate and surrounding areas.
Huge front-end loaders transport the blasted rock salt to the primary crusher. Loaders dump their loads of salt into a powerful spinning crusher, where large pieces are quickly crushed and screened down to small pieces. The salt is then transported to the hoisting shaft where skip hoists bring the loads to the surface in a matter of seconds.
Upon reaching the surface, the salt is stored here at the mine in our huge stockpile where it is loaded and sent out to customers by rail car or by truck.
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