Sibai quarry, the second deepest in the world (15 photos)
Sibai mine - mine mednotsinkovokolchedannoe Russia, located in
Bashkortostan. Opened in 1913. Development began in the 1930s of the XX century.
Along with the development of the field the city was founded Sibai. Sibai pit depth
ranked second in the world. His depth of over 500 meters, with a diameter of 2 kilometers.