EE BACKED HAUL TRUCK #2082 UNDER THE 1214 XPB SHOVEL & RECEIVED THE 1ST BUCKET LOAD OF MATERIAL (120 TONS). ON THE 2ND PASS, THE OPERATOR WAS JOLTED BY THE MATERIAL BEING LOADED INTO THE HAUL TRUCK AND SUSTAINED LOWER BACK INJURY. SECOND BUCKET OF MATERIAL WAS ALSO 120 TONS OF OVERBURDEN. OPERATOR WAS WERAING HER SEATBELT.