AFTER BLASTING A NORMAL ROUND, THE CREW WENT BACK INTO THE SHAFT APPROX 1 HR LATER. THEY NOTICED SMALL BLUE FLAMES ON THE MUCK PILE. CREW EVACUATED IMMEDIATELY. UPON RE-ENTRY 30 MIN LATER, THE FLAMES WERE GONE. MSHA & DMME WERE NOTIFIED. METHANE WAS NEVER DETECTED.