The Khewra Salt Mine is located in Khewra, north of Pind Dadan Khan, an administrative district in Jhelum District, Punjab Province, Pakistan. It is the largest and oldest salt mine in Pakistan and the second largest in the world. It is a major tourist attraction, attracting 250,000 tourists every year. Its history dates back to 320 BC when Alexander’s army discovered it. But started to sell during the Mughal era. Additionally, the main tunnel at the ground level was built by Dr. H. Warth, a mining engineer during British rule in 1872. After the spin-off, the mine was acquired by the Pakistan Mineral Development Corporation and remains the country’s largest exporter of salt, producing more than 350,000 tonnes of 99% pure halite per year. Hence, the mine’s salt reserves are estimated to be between 82 and 600 million tonnes.

Khewra Salt Mine is located at Pind Dadan Khan Tehsil in Jhelum District. It is about 200 km (125 miles) from Islamabad and Lahore, accessible via the M2 highway, and about 30 km (20 miles) from the Lilla Junction when you go to Pind Dadan Khan on the Lilla Road. Furthermore, the mine is located in a mountain range that forms part of the Salt Mountains, a mineral-rich mountain system that stretches approximately 200 kilometers from the Jhelum River south of the Pothohar Plateau to its confluence with the Indus River. However, the Khewra mine is located at an altitude of 288 meters (945 feet), approximately 730 meters (2,400 feet) from the mine entrance to the mountain. The underground mine covers 110 kilometers (43 square miles).

Source: https://travelpakistani.com/blogs/khewra-salt-mine–world-second-largest-salt-mine/70