For Class C, what are the maximum numbers of underground and surface workers?

For Class C, what are the maximum numbers of underground and surface workers?

• A. 50 underground and 75 surface
• B. 25 underground and 50 surface
• C. 150 underground and 250 surface
• D. 75 underground and 100 surface

Answer: (A)

Safety limits on crew size are set to ensure quick evacuation, clear communication, and effective supervision in different mine classifications. For Class C, the maximum numbers are fifty underground workers and seventy-five surface workers. Keeping underground crews to fifty helps maintain manageable evacuation routes, reliable radios or other communications, and enough supervisors to coordinate actions during an emergency. The surface crew is capped at seventy-five to ensure the incident command can efficiently organize ventilation, signaling, rescue readiness, and overall coordination with the underground team. These limits strike a balance between productive operations and safety, preventing scenarios where too many people could overwhelm escape routes or hinder rapid rescue and decision-making. The other listed options exceed or fall short of the established safety thresholds for this class, which is why the fifty underground and seventy-five surface configuration is the correct choice.

Safety limits on crew size are set to ensure quick evacuation, clear communication, and effective supervision in different mine classifications. For Class C, the maximum numbers are fifty underground workers and seventy-five surface workers. Keeping underground crews to fifty helps maintain manageable evacuation routes, reliable radios or other communications, and enough supervisors to coordinate actions during an emergency. The surface crew is capped at seventy-five to ensure the incident command can efficiently organize ventilation, signaling, rescue readiness, and overall coordination with the underground team.

These limits strike a balance between productive operations and safety, preventing scenarios where too many people could overwhelm escape routes or hinder rapid rescue and decision-making. The other listed options exceed or fall short of the established safety thresholds for this class, which is why the fifty underground and seventy-five surface configuration is the correct choice.