AN IGNITION OF A BLASTING AGENT OCCURRED. A HOLEWAS DRILLED & THE STEEL GOT STUCK IN THE HOLE. WHEN THE STEEL BROKE LOOSE & WAS TAKEN OUT OF THE HOLE, STEAM & FLAMES CAME OUT OF THE HOLE. APPROX. 1 HOUR LATER, HOLE WAS CHECKED FOR HEAT,NO HEAT WAS DETECTED SO HOLE WAS LOADED. ABOUT 10-20 MINUTES LATER, THE HOLE IGNITED.