Most professionals and managers at the mines here in Nevada work 4-10's, M-Th or T-F.
Some are on 8/6 instead of 4-3.
My miners work 7/7, 12 hour shifts. Some of the other mines work 5/4 - 4/5, or a super 7 which I have never worked myself and don't really understand. Rumor has it many are moving to the 7/7 we've been doing for the last few years. The guys seem to like it. Many of them live in Idaho or Montana and travel down here for work.