Thirty Siberian coal miners are buried so deep in Russia's largest underground coal mine that rescuers use up most of their oxygen tanks trying to reach them and can't spend much time searching for the missing men, the regional governor said Tuesday...The death toll from the two explosions that hit the mine in the Siberian region of Kemerovo rose to 60 after rescuers found eight more bodies...Both the explosions are being blamed on methane...Mine explosions and other industrial accidents are common in Russia and other former Soviet republics, and are often blamed on inadequate implementation of safety precautions by companies or by workers themselves.