What is the maximum distance temporary support is set from the location permanent support is being installed?

The correct answer is that temporary support must be set no more than 12 inches from the location where permanent support is being installed. This guideline is crucial for ensuring safety during the installation process.

When installing permanent support systems such as roof bolts, it is essential to minimize the risk of ground failure or collapse. By limiting the distance of temporary support to within 12 inches, the stability of the underground mine structure is maintained, protecting both the workers and the integrity of the installation site.

This close proximity allows the temporary supports to effectively counteract any potential shifts or movements that may occur as the permanent support is being put in place. It also ensures that the workers have adequate safety measures in place while they are handling the installation of the permanent supports.

In contrast, options that suggest larger maximum distances, such as 18, 24, or 36 inches, would increase the risk of unsafe conditions, as the temporary support may not provide adequate protection against ground movement during the installation of the permanent supports. Thus, maintaining this strict distance is a vital part of safe mining practices.