Overburden to coal ratio

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The overburden-coal ratio , also overburden-to-coal ratio , overburden / coal ratio ( A: K ratio ) is a term from mining , it is used in the field of opencast coal mining. It describes the ratio of "overburden to coal", i.e. how many parts of overburden (m³), i.e. overburden and intermediate materials such as sand, gravel or loess , must be cleared aside over and between the coal seams to be mined in order to remove one part of coal ( t) to win. Lignite is considered economically viable up to an A: C ratio of 10: 1 .

Individual evidence

  1. ↑ Tina Bielig: Unintended outputs in the extraction and conversion of lignite into electricity . Universitätsverlag der TU Berlin, Berlin 2010, ISBN 3-7983-2232-5 ( limited preview in Google book search).
  2. ↑ Stephan Lenk: Groundwater quality and hydrogeochemical processes in Rhenish lignite tailings and in their effluent . (Dissertation, series Bochum Geoscientific Work ; Issue 13). Ruhr University Bochum , 2008 ( full text [PDF; 8.1 MB ]).