How far should the highwall face be examined before and during shifts?

The correct answer is that the highwall face should be examined 25 feet before and during shifts to ensure safety and operational efficiency. This distance is significant because it allows for a comprehensive assessment of potential hazards, such as loose rock, instability, or other geological issues that could impact worker safety and equipment operation.

Examining 25 feet of the highwall face provides a buffer zone for foremen and crew members to identify and mitigate risks before commencing work. It allows for thorough observation and the ability to take preemptive measures to address any issues that may arise. This practice is aligned with best safety standards in the mining industry, promoting continuous monitoring and proactive management of the highwall conditions.

While shorter distances like 10 or 15 feet may seem adequate, they do not provide enough margin for detection of issues that could be present beyond those limits. A distance of 50 feet might be excessive in some contexts, potentially leading to unnecessary delays without significantly enhancing safety. Hence, the 25-foot examination is the most balanced and effective approach for ensuring the safety of personnel and operations on the highwall face.