White and Blue

Apparently a large vein of limestone runs through Shelby County, Alabama and all along the vein there are very large open pit mines, hidden to some extent behind twenty foot earthern berms, but clearly visible in Google satellite photos, like here and here, and occasionally from the road.  The plant above is one of several where the limestone is processed into lime for use by numerous industries, and is located near the first link above.  Everything around the plant is covered in white dust, including the plant itself.