Risk control management of safety in coal mines should be established on the basis of the identified root hazards and their corresponding status hazards. If the identified status hazards
are further divided, they can be divided into controlled status hazards and uncontrolled status hazards (status hazards which have gone out of control). Controlled status hazards refer to the
situation where the root hazards are managed within normal and safe operating parameters. On the contrary, the uncontrolled status hazards refer to the situation where the root hazards could
be operating out of safety control criterions, which are operating conditions that could trigger accidents under some conditions. An illustration of the above classification of hazards is shown in Figs. 1 and 2.