The enormous and ancient Salt Mines of .
In 1870, the Khewra Salt Mine was renamed as the Mayo Salt Mine, in honor of Lord Mayo, the Viceroy of India who paid a visit to the site. The British continued mining salt, and improved mining techniques. In 1872, Dr. H. Warth, a British mining engineer, developed the main tunnel at ground level. Warth proposed that only 50 percent of the salt should be mined, while the other 50 percent ...