top 5 ways to die in a mine shaft

I'm finally doing some much-needed research into mining towns and mining techniques of the 19th century for to finish the end of my Boz and Lily story. I knew mining was dangerous but Holy Hera. Here are some of the leading contenders, in no particular order:

Heat exhaustion. At depths greater than 1000 feet the air temperature could be 120º or more. 
Falls. Sometimes when men were brought up