Witnessed recently at Bulga open cut coal mine.
If there is a blast nearby to where you are working at the time, you are evacuated to a safe position, where you can sometimes witness the shot being fired. Sentries are placed at the perimeter of the safe distance so that nobody can enter the shot zone. Radio silence is called, so that all two-way communications are ceased except for the shot firers. You can tune in and listen to it all being called and counted down while you sit back and watch.
The best thing here for me is that not only am I being paid while I have been evacuated from my workplace, I get to see some truly awesome sights (not to mention pass them on as best I can)!
Once the sentries are in place - which are just guys in four-wheel drives at every entry point to the shot zone - an all clear is given and the shot is counted down from ten. Depending upon your proximity to the shot and how deep it is into the cut you will hear it go off as a boom and a rumble. The higher up it is (this one is on the top of the cut) the better the sound seems to travel. The ground will shake for a period. Then it's called as all clear and off we all go back to work.