lead-zinc underground mining at song toh thailand from exploration

labour underground The work which may be harmful to health and safety of the employee are, viz : work to be done underground or underwater or in a cave, tunnel or foul air

The work which may be harmful to health and safety of the employee are, viz : work to be done underground or underwater or in a cave, tunnel or foul air  labour bkk 01 boilers, exhausted ducts, tunnels, underground utility vaults and pipelines Some workers who were not fit for work would not get work permit and be stopped