https://www.circleofblue.org/wp-content/uploads/2018/06/Circle-of-Blue-Water-Speaks-600x139.png 0 0 Circle of Blue https://www.circleofblue.org/wp-content/uploads/2018/06/Circle-of-Blue-Water-Speaks-600x139.png Circle of Blue2013-07-15 16:01:222013-07-15 16:01:22To tap an underground coal vein, the rock and dirt, called overburden, must be removed. At Southeastern Coal Ltd.’s massive open-pit mine in Gevra, the thick coal seam lies below the gray overburden. (Image © Aubrey Ann Parker / Circle of Blue)
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