The Khewra Salt Mine (or Mayo Salt Mine) is located in Khewra, north of Pind Dadan Khan,an administrative subdivision of Jhelum District, Punjab Region, Pakistan, which rises from the Indo-Gangetic Plain.It is Pakistan’s largest and oldest salt mine and the world’s second largest.It is a major tourist attraction, drawing up to 250,000 visitors a year.Its history dates back to its discovery by Alexander’s troops in 320 BC, but it started trading in the Mughal era.The main tunnel at ground level was developed by Dr. H. Warth, a mining engineer, in 1872 during British rule. After independence, the Pakistan Mineral Development Corporation took over the mine, which still 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.
Khewra Salt Mine is situated in Pind Dadan Khan Tehsil of Jhelum District. Located about 200 km (125 miles) from Islamabad and Lahore, it is accessed via the M2 motorway, about 30 kilometers (20 miles) off the Lilla interchange while going towards Pind Dadan Khan on the Lilla road.The mine is in mountains that are part of a salt range, a mineral-rich mountain system extending about 200 km from the Jhelum river south of Pothohar Plateau to where the Jhelum river joins the Indus river.Khewra mine is about 288 meters (945 feet) above sea level and about 730 meters (2400 feet) into the mountain from the mine entrance. The underground mine covers an area of 110 km2 (43 sq. miles)