Salt has been mined at Khewra since 320 BC, in an underground area of about 110 sq. km. Khewra salt mine has estimated total of 220 million tones of rock salt deposits. The current production from the mine is 325,000 tons salt per annum.
The mine-head buildings have 17 stories, with 11 below ground. The salt-mine is 945 feet above sea level and extends around 2,400 feet inside the earth from the mine-mouth. There are 17 working levels and the cumulative length of all tunnels is more than 40 km.
Salt occurs in the form of an irregular dome like structure. There are seven thick salt seams with a cumulative thickness of about 150 meters. At places the rock salt is 99% pure. Salt is transparent, white, pink, reddish to beef-color red. There are beautiful alternate bands of red and white color salt.
Afterwards this mine was wholly purchased by a local Raja and from that era to Independence of Pakistan this mine remained property of locally living Raja's who were sons of Raja Mal.
They are linked to the nearest place called Malot Fort created by Raja Mal.
In March 1849, the British captured the salt mines and a resistence movement began against the poor conditions and prices imposed upon the miners.
From 1849 - 62 there were strikes which were heavily suppressed and in 1872, new methods of measurement and pricing were introduced which increased workload. Mines were locked so miners couldn't leave without fulfilling their quotas. Men, women and children all worked in the mines and some children were even born in the mines due to the conditions imposed.
Further strikes were carried out by the workers from 1872 - 76. This time, the Chief mine engineer Dr. Warth got Delhi Head Office Collecter H.Wright to bring in British soldiers. 12 of the workers representatives were shot at the front of the mines. Their names were:
Their graves are outside the middle gates of the mines.
More recently the miners won an important environmental case against the ming company for the provison of unpoluted drinking water. This case is internationally recognised as important in showing the relationship between the environment and humanity.