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Table 1 Exploitation quantity of coal from 2007 to 2014

From: Evaluation of groundwater pollution in a mining area using analytical solution: a case study of the Yimin open-pit mine in China

Year Exploitation quantity (tons) Year Exploitation quantity (tons)
2007 9.41 × 106 2011 1.50 × 107
2008 1.383 × 107 2012 1.53 × 107
2009 1.42 × 107 2013 1.55 × 107
2010 1.453 × 107 2014 1.23 × 107