Coal 1 : (a) Anthracite, bituminous coal, lignite, oil shale, peat, and sub-bituminous coal; and (b) includes every other substance worked or normally worked with coal
Ministry of Business, Innovation and Employment, Glossary of terms and acronyms, Wellington, New Zealand 2010. http://wwwsosh.govt.nz/resources/glossary-u.shtml, (Occupn Hlth and Sfty - Brit) {530}