This place was once called the copper mountain. Not far from the village of Tuim, in the first half of the XXth century, non-ferrous metals were mined - wolfram, copper, molybdenum. All work in the mountain was carried out underground using explosives and jackhammers. Ore was taken out on trolleys and sent to the non-ferrous metal factory in Tuim. Having devastated the mountain, the mine was closed, its further development was considered inefficient.
The devastated mountain did not seem to pose any danger. The children continued to run there. The inhabitants of the village grazed their cattle there. But over time, the cattle began to fall under the ground. Gradually, a hole with a diameter of about 6 meters formed on the mountain, and it was decided to blow up the mountain. As a result of the explosion, a huge failure with a diameter of up to 200 meters was formed, and below there appeared a lake with emerald-coloured water. The distance from the top of the cliff to the water makes about 120 meters. If you look closely, you can see adits and trolley rails.
Popularity for the Tuim failure came after the filming of Yuri Senkevich's TV show "Club of Travelers" and the TV game "Fear Factor". Not only residents of Khakassia come to look at the huge failure, but also tourists from other regions traveling around the republic.
