30 CFR § 50.20-5
Criteria--MSHA Form 7000-1, Section B.
Code 01--A death of an individual at a mine;
Code 02--An injury to an individual at a mine which has a reasonable potential to cause death;
Code 03--An entrapment of an individual for more than 30 minutes;
Code 04--An unplanned mine inundation by a liquid or gas;
Code 05--An unplanned ignition or explosion of dust or gas;
Code 06--An unplanned mine fire not extinguished within 30 minutes of discovery;
Code 07--An unplanned ignition of a blasting agent or an explosive;
Code 08--An unplanned roof fall at or above the anchorage zone in active workings where roof bolts are in use; or a roof or rib fall on active workings that impairs ventilation or impedes passage;
Code 09--A coal or rock outburst that causes withdrawal of miners or which disrupts regular mining activity for more than one hour;
Code 10--An unstable condition at an impoundment, refuse pile, or culm bank which requires emergency action in order to prevent failure, or which causes individuals to evacuate an area; or, failure of an impoundment, refuse pile, or culm bank;
Code 11--Damage to hoisting equipment in a shaft or slope which endangers an individual or which interferes with use of the equipment for more than thirty minutes; and
Code 12--An event at a mine which causes death or bodily injury to an individual not at the mine at the time the event occurs.