PDF-Surface mining ground control is covered in nine subsections within Pa

Author : luanne-stotts | Published Date : 2015-10-13

Severity Commodity Lost time Coal 1807 23 1830 Metal 140 5 145 Nonmetal 15 0 15 Stone 14 9 23 Subtotal 1976 37 2013 lost time Coal 777 9 786 Metal 269 3 272 Nonmetal

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