VANS WERE PREPARING TO DEPART THE MINE SITE AND RETURN TO HOME (ELY, NV). EE WAS SITTING IN THE VAN AND STARTED HAVING TROUBLE BREATHING. HE BECAME UNRESPONSIVE, WITH NO VITAL SIGNS. CPR WAS S TARTED. LIFE FLIGHT ATTENDANTS ARRIVED AND CONTINUED CPR UNTIL A DOCTOR AT THE HOSPITAL IN ELKO ADVISED THAT THEY COULD STOP CPR.