EMPLOYEE WAS HOLDING UP A LOWBOY TONGUE BY HAND AS ANOTHER EMPLOYEE WAS OPERATING A LOCOMOTIVE THAT WAS PUSHING ANOTHER LOCOMOTIVE THAT WAS GOING TO BE COUPLED TO THE LOWBOY TONGUE. EMPLOYEE DROPPED THE LOWBOY TONGUE AND IT SMASHED HIS RIGHT ANKLE AGAINST THE TRACK RAIL. NO DAMAGE TO MINING OPERATION. INJURY DID NOT INVOLVE COMPLIANCE, JOB SKILLS, PROFICIENCY, TRAINING, ETC.