Yeah they run on channel 10, its for the drivers who pick up rock, and they also run it for their loaders but I think their blasting and quarrying operations are on VHF. I had an odd job to do a few weeks ago and I just happened to have a handheld in my backpack, alot better than hollering out the window.
Metal recyclers often use CB also. These 2 things are about the only productive things left on CB, I just let em be and use one of the other 39 channels, or the 40 up or down or those few befre you hit 28.000.