How many workers must a class "A" mine underground have at a minimum?

In underground mining operations, the classification of a mine as "Class A" typically indicates that it is one of the more extensive and complex types of mines, requiring a larger workforce to manage the various operations effectively. The minimum requirement of 150 workers ensures that there is sufficient manpower available to handle tasks such as extraction, ventilation, safety checks, maintenance, and emergency preparedness.

Having a minimum of 150 workers also facilitates the implementation of safety protocols, monitoring, and the presence of adequate supervisory staff. This workforce size is considered essential to ensure compliance with safety regulations and to provide a sustainable operational environment in the challenging conditions underground. Overall, the requirement reflects an industry standard aimed at maintaining both productivity and safety within Class A mines.