11. Gas explosions usually happen because of inadequate ventilation to draw out deadly fumes leaking from the coal bed . 12. Preparatory works are underway to explore and commercialize the abundant coal bed methane potential of our coal deposits. 13. Green Dragon Gas was incorporated in 2006 in Hong Kong, and mainly extracts coal bed methane in China. 14. The individual teeth were discovered in the coal bed over the course of about six or seven years. 15. Explosions are often blamed on a lack of ventilation to clear natural gas that seeps out of coal beds . 16. One coal bed , where the creek flows between Red Ridge and Green Ridge, has a thickness of up to. 17. The Pittsburgh rider coal bed , which overlies the lower bench, can range from 0 to 3 feet in thickness. 18. As of 2012, shale gas, like coal bed methane ( CBM ), is not yet being developed in Indonesia. 19. Since then the campaign has broadened out to a campaign against coal bed methane and underground coal gasification too. 20. A nearby coal bing ( spoil heap ) was used as a speedway training track in the late 1960s.
