What is "kan-i-gut"

Kan-i-Gut (or Kanigut or Kani-Gut, "mine-of-loss") cave is a geological protected area (nature monument) located at north slopes of Turkestan Range in Batken Region of Kyrgyzstan. The cave consists of 18 large caverns, deep cavities, narrow passageways and tunnels. Its length is more than 1 km. From the 6th to the 11th century the cave served as a lead and iron mine.