How frequently should the mine foreman or his assistant examine each working face?

The correct answer indicates that the mine foreman or their assistant should examine each working face at least every 2 hours. This frequency is essential for maintaining safety and ensuring that any hazards or changes in the working environment are promptly identified and addressed. Regular inspections help in monitoring the stability of the mine, assessing air quality, and ensuring compliance with safety regulations. By conducting these examinations at least every 2 hours, the foreman can effectively manage risks that could endanger miners and equipment.

In the context of mining operations, faces can change and develop hazards rapidly due to geological conditions or ongoing work. Therefore, more frequent examinations contribute to a safer working environment and align with best practices within the industry. Other suggested frequencies may not provide adequate oversight, potentially allowing unsafe conditions to persist longer than acceptable.