What is the difference between Part 46 and Part 48 training?

What is the difference between Part 46 and Part 48 training?

 Part  46  regulates  the  training  and  retraining  of  miners  engaged  in  shell  dredging  or employed  at  sand,  gravel,  surface  stone,  surface  clay,  colloidal  phosphate,  surface limestone,  marble,  granite,  sandstone,  slate,  shale,  traprock,  kaolin,  cement,  feldspar, and lime mines only. Part 48 is for all other mines not listed above to include coal and metal mines.

If you are a contractor and will be working a multiple mines it is best to obtain the Part 48 certification. This will allow you to work on all Part 48 and Part 46 mines in the US. With just a Part 46 certification you can not work on Part 48 mine sites.