What On Earth Is This !!??!?!?!!?

I really have no idea what on Earth is the. Anyone been to Russia or going to visit Russia. Please don't miss this spot and take some picture for me.....

No wonder the Earth is sick so badly...imagine someone dig a hole like that on you body.....buekkk!!!

*Source from http://www.usmra.com/photos/bigpit/

Huge open pit mine near Mirny, Russia, East Siberia

525 m deep, 1200 meters in diameter. The air zone within this mine is closed for helicopters - a few accidents occurred when they were "sucked in" by downward air flow...

Track dimensions are:Length 13,360 mm, Width 7,780 mm, Height 6,650 mm

What is a Open Pit Mine?

Ans from Wikipedia : Open-pit mining, or opencast mining, refers to a method of extracting rock or minerals from the earth by their removal from an open pit or borrow.