HAMBACH, GERMANY - SEPTEMBER 1: One of the world's largest bucket-wheel excavators digging lignite (brown-coal) in of the world's deepest open-pit mines in Hambach on September  1, 2010.
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HAMBACH, GERMANY - SEPTEMBER 1: One of the world's largest bucket-wheel excavators digging lignite (brown-coal) in of the world's deepest open-pit mines in Hambach on September 1, 2010.