Suspect Evgeny Bukharin, 40, offered Viktoria Reymer, 12, a ride on his snowmobile when she held up at a bus stop on a visit to her elder sister - reports gathered.
He took Viktoria Reymer, to his own home, where he sexually attacked her and threw her alive down a 330ft mineshaft.
"The accused was driving his snowmobile and saw the girl waiting at the bus stop," said a source in the Investigative Committee, Russian equivalent of the FBI.
"He offered to give her a ride to her sister's.
"Since she knew the man, she agreed.
"But the attacker took the victim to his house, where he raped her".
"Then he took the child to the air shaft and threw her into it."The girl died as a result of her injuries from the fall, police said.
At first the suspect claimed he had unintentionally hit theViktoria with his snowmobile, and she died.
Forensic examination of the body showed "that the girl was still alive when thrown into the shaft which contained dangerous level of methane gas", said law enforcement sources.
Viktoria died from injuries to the head, neck and chest.
Locals say that the man was a colleague of the girl's late father who had died at an accident at the same colliery.
The suspect was arrested and is now in detention as a criminal investigation into rape and murder commences.