Khewra Salt mine was discovered, however, not by Alexander, nor by his allies, but by his army's horses, when they were found licking the stones. Ailing horses of his army also recovered after licking the rock salt stones.

The Khewra Salt Mine in Pakistan is the world’s 2nd largest salt mine. The Khewra Salt Mine is also known as Mayo Salt Mine, in honor of Lord Mayo, who visited it as Viceroy of India. The salt reserves at Khewra were discovered when Alexander the Great crossed the Jhelum and Mianwali region during his Indian campaign.

During the Mughal era, the salt was traded in various markets, as far away as Central Asia. On the downfall of the Mughal empire, the mine was taken over by Sikhs. Hari Singh Nalwa, the Sikh Commander-in-Chief, shared the management of the Salt Range with Gulab Singh, the Raja of Jammu. The former controlled the Warcha mine, while the latter held Khewra. The salt quarried during Sikh rule was both eaten and used as a source of revenue. In 1872, sometime after they had taken over the Sikhs' territory, the British developed the mine further

After independence, the Pakistan Mineral Development Corporation took over the mine, which remains the largest source of salt in the country, producing more than 350,000 tons per annum of about 99% pure halite. estimates of the reserves of salt in the mine vary from 82 million tons to 600 million tons.

There are many different sights to see within the salt mines. The salt itself has beautiful colors which include transparent, red, pink, and white shades. The formations of the minerals on the ceiling and elsewhere are guaranteed to be eye candy. The curators and artists have also created structures like the Badshahi Mosque, Replicas of World Monuments, Salt Fountain, Brine Ponds, etc.

Khewra has led to over 40 kilometers of underground tunnels and produces over 325,000 tons of salt each year. Amazingly, this isn’t even a dent into the salt that’s stored here, which is estimated to be about 6.687 billion tons. The mine is 748 feet deep with 11 stories, the mine is filled with tunnels that run nearly half a mile into the mountain. Only 50% of what is mined is taken out, the other 50% is used as support columns in the enormous mine.