Alhamdulellah Pakistan is rich of Natural resources, amongst these resources salt is the one big natural resource of Pakistan. Pakistan is one of the biggest producer of Salt.
That is Khewra salt Mines, Karak Bahadur Khail Salt mines etc. there are two way to produce salt,
1. Rock salt Mining.
2. Brine .
Initially, salt production start in the coastal area from brine. An excess of wood products at the time (late 1800's) provided the raw materials required to "dewater" the brine. When the lumber industry fell off, so did the salt brine industry. Those old wells simply drew the brine up, and evaporated the water. Today, all brine operations inject steam or hot water into dry salt beds and extract the brine.Halite salt (NaCl) can be mined in two different ways: as a solution or in dry mining. In solution mining, fresh water is injected through a pipe into deep shafts that end in the salt beds, and salty water (brine) is drawn upward and dried, to recrystallize the salt. Or, salty brine found in shallow wells can simply be pumped to the surface and dried there, to make salt. In dry mining (below), the salt is mined in large underground caverns; much like one would mine coal or iron ore. Dry mining is only practiced in the Developing countries as well as in District Karak, Khyber Pakhtunkhwa, Pakistan. Salt worth millions of Rupies comes (or at least used to come) from District Karak, Khyber Pakhtunkhwa, Pakistan each year.