Steve Wolken's Powder River Basin Pictures   URSA MAJOR (Bucyrus-Erie  2570WS)   Arch Coal claims that Ursa Major is "North Americas largest operating dragline".  It weighs in at 14.7 million pounds, has a 170 CuYd bucket and a 360 ft boom.  Acquisition cost was $50 million.     Notice the man walking behind Ursa.        NEXT