Study of the parameters of spontaneous fire seats in coal pit rock dumps Sergey Protasov, Evgeny Seregin, Vyacheslav Portola, Alena Bobrovnikova and Marina Gorbacheva E3S Web Conf., 315 (2021) 02007 Published online: 28 October 2021 DOI: 10.1051/e3sconf/202131502007