What is the maximum distance that temporary supports can be placed apart in unsupported crosscuts?

The maximum distance that temporary supports can be placed apart in unsupported crosscuts is critical for maintaining safety in mining operations. In this context, the correct answer reflects the regulations that are designed to minimize the risk of rock falls and ensure the stability of the mine structure.

When temporary supports are set too far apart, the risk of geological instability increases, as the weight of the rock can exceed the load-bearing capacity of the support structures. By adhering to the guideline of placing supports no more than 4 feet apart, miners can create a safer environment during operations and reduce the potential for accidents.

This specific distance aligns with industry standards and practices that are informed by both engineering principles and practical experience in underground mining operations. It's essential for mine foremen and workers to understand these safety regulations and implement them effectively to protect themselves and their colleagues.