Building a facility over a coal mine is tricky business, a balance of sorts. The facility must be very durable, since it is to be used 24 hours a day by hundreds of workers. But it will also have a shorter shelf life, which is dependent on the coal excavated from under ground. So the facility will shine bright for a few years and then burn out. It’s an odd balance, but it has been achieved in at least one mine facility in Western Pennsylvania. Arguably, without the use of epoxy on the floors, it wouldn’t have been possible.