Planted Tank Enthusiast
Join Date: Feb 2011
Location: Jerseyville, IL just on the other side of the Mississippi river from St. Louis MO.
Coal slag is the left over material of coal being burnt in power plants. I used to unload coal trains and seen hills of the stuff. They sell it for other things as well like for ash trays, putting down on snow and ice, as well as blast media. The chances of getting metal in your bag is good because most coal burning power plants burn a small (compared to the amount of coal burnt) percentage of shredded tires. And tires contain wire and would then possibly not be consumed in the burning process. Also sand or stone fragments would contain silica which would turn to glass given the high heat that the coal is burnt at. Actually, a lot of elements and compounds could fuse to form glass like material given the extreme temps they would be subjected to.