Try here as a start
http://www.wvminesafety.org/electrical.htm You will be working heavily in hazardous environments with combustible gases and dusts so read up on NEC Chapter 5 and anything you can get your hands on for Hazardous Zone training, and explosion proof equipment.
I am not sure if mines have industry specific electrical programs or if you have to start with a regular electrical liscense and work up. You will have a lot of lives depending on how well you do your work.
Good luck on your search.
