Before booking your work group on a guided tour of a coal mine, you should probably do a little homework.
You might google the tour company and find out if previous groups have returned from the tour alive. Or just read their brochure. If it says something like, "Your thrilling trip to the coal mine ends with a blaze of glory as your guide slings the mine cart caroming into the flames of the smelting pit!" then you might plead a tight schedule and ask for the abridged version.
Or just don't go at all, because I don't think coal mines are even supposed to have smelting pits.
Death by immolation is one thing. Being misinformed on an educational fam trip? Completely unacceptable.