EMPLOYEE WAS SITTING ON SUPPLY TRACTOR WHILE FILLING TRAILER. HE WAS PAGED ON THE MINE PHONE, AND TRIED TO EXIT THE TRACTOR ON THE RIGHT SIDE, GOING FACE FIRST DOWN THE STEPS. HE LOST HIS FOOT ING AND FELL APPROX 30"" TO THE GROUND. HE LANDEDON HIS LEFT FRONT SIDE. HE FRACTURED HIS LEFT SCAPULA.