YAKUTIA, RUSSIA - APRIL 17, 2017: A piece of coal at the Neryungrinsky coal mine of Yakutugol, a part of Mechel Group of Companies. The Yakutugol Holding Company, one of the largest coal company in Russia and one of Russia's few hard coking coal producers, mines mostly high-quality K9-grade coal. Artyom Geodakyan/TASS (Photo by Artyom Geodakyan\TASS via Getty Images)