#7 DISCHARGE ELEVATOR ON THE OLD BALL MILL SYSTEM STOPPED AND WOULD NOT START. EE WAS CHECKING THE ELECTRICAL SYSTEM AND OPENED THE FUSE BOX FOR #7 DISCHARGE ELEVATOR. WHILE THE BOX WAS OPEN THERE WAS AN ELECTRICAL FLASH, SHORTING OUT THE ELECTRICAL SYSTEM. EE RECEIVED 1ST AND 2ND DEGREE BURNS TO BOTH OF HIS HANDS.