EE IS STATING THAT HE WAS OPERATING THE HITACHI EX1800 SHOVEL IN THE WEST END OF THE AREA #2 PIT STRIPPING SHALE AND LOADING END DUMPS. HE BACKED THE MACHINE UP AWAY FROM THE HIGHWALL TO ALLOW A DOZER TO CLEAN THE BOTTOM. AS HE STARTED TO MOVE UP A SECTION OF THE HIGHWALL FELL IN STRIKING THE CAB AND MACHINE.