Creating Waves of Awareness
How Products Are Made: An excellent page with information on the origins of salt use, source and manufacturing states:
The earliest method of salt production was the evaporation of seawater by the heat of the sun. This method was particularly suited to hot, arid regions near the ocean or near salty lakes and is still used in those areas. Solar evaporation was soon followed by the quarrying of exposed masses of rock salt, which quickly developed into the mining of underground deposits of salt. Two thousand years ago the Chinese began using wells to reach underground pools of salt water, some of which were more than 0.6 miles (1.0 km) deep.
In areas where the climate did not allow solar evaporation, salt water was poured on burning wood or heated rocks to boil it. The salt left behind was then scraped off. During the time of the Roman empire, shallow lead pans were used to boil salt water over open fires. In the Middle Ages these were replaced with iron pans which were heated with coal. In the 1860s a procedure known as the Michigan process or the grainer process was invented, in which salt water was heated by steam running through pipes immersed in the water. This process is still used to produce certain types of salt. By the late 1880s open pans were replaced by a series of closed pans, in a device known as a multiple-effect vacuum evaporator, which had been used in the sugar industry for about 50 years.
Today the United States is the world's largest producer of salt, followed by China, Russia, Germany, the United Kingdom, India, and France.
UNDERCUT MINING: When a site is selected for mining, shafts are sunk into the center of the salt deposit. Then a machine that looks like a gigantic chain saw is used to cut a slot about 6.0 inches (15 cm) high, about 66 feet (20 m) wide, and about 10 feet (3 m) deep into the salt at floor level. This process is known as undercutting. A series of holes are drilled into the undercut salt with an electric drill containing a tungsten carbide bit. These holes are filled with an explosive such as dynamite or ammonium nitrate. Electric blasting caps connected to long wires are attached, and the explosive is detonated from a safe distance. Cutting and blasting are repeated in a pattern that leaves pillars of salt standing to support the roof of the mining area. This is known as the room-and-pillar method and is also used in coal mines.
HIMALAYAN SALTS: Salts obtained from this 250 million year old salt range located on the foothills of the Himalayas contains no toxins or pollutants. Himalayan salt is entirely extracted by hand, with dynamite blasting prohibited. The Himalayan salts contain 84 natural minerals that are present in our body in trace amounts, which adds to their beneficial effects.
I'm looking forward to additional information about the use of natrum muriaticum for high blood pressure. We all know that we're told to reduce or monitor our salt intake.
PDF FIle by Gary Taubes on the Political Salt Controversy
Frontline Interview with Gary Taubes