What is the minimum number of surface workers required for Class B classification?

• A. 75
• B. 50
• C. 150
• D. 25

Answer: (A)

Staffing levels for surface operations are defined by classification, and for Class B the minimum surface workforce is 75. This ensures enough personnel to cover all essential surface roles across shifts—supervision, safety monitoring, fire watch, first aid, maintenance, and emergency response—so safety coverage remains constant as crews rotate. With fewer workers, such as 50 or 25, essential safety duties and shift coverage could be compromised, which is why those numbers align with smaller classifications. If there are about 150 surface workers, the operation would typically fall into a larger category with stricter or different requirements, not Class B.