INDONESIAN COAL INDUSTRY OUTLOOK
114 CHAPTER 7 Coal is an organic rock (as opposed to most other rocks in the earth's crust, such as clays and sandstone, which are inorganic); it contains mostly carbon (C), but it also has hydrogen (H), oxygen (O), sulfur (S) and nitrogen (N), as well as some inorganic constituents (minerals) and .Underground Coal Mine Disasters 1900 - 2010: Events, Responses, and a Look to the Future . Michael J. Brnich, Jr., BS, CMSP . NIOSH Office of Mine Safety and Health . Pittsburgh, PA, USA . Kathleen M. Kowalski-Trakofker, Ph.D. NIOSH Office of Mine Safety and Health . Pittsburgh, PA, USA . ABSTRACT: This paper captures almost 110 years of .