Looks a lot like the open pit copper mine in my hometown, Ajo, Arizona.
On earth, blasting sends debris along parabolic arcs that quickly return to earth. On an asteroid, a lot of the rocks and dust would be sent into orbit about the rock. It would result in a permanent debris cloud that would make landing and leaving the rock more difficult.
I believe blasting will be done under blast blankets. Or perhaps the mines will be tunnels burrowed underground instead of open pit. If humans are present, they would need to be underground to protect them from radiation.
Fair points. But it was just an idea, perhaps the asteroid/dwarf planet was big enough to have a strong gravitational pull to get the debris back on the surface or maybe its neighbouring planet pulled it back, and perhaps the open pit mining was a cheaper and more efficient way of getting resources. As for the radiation maybe the asteroid is orbiting a gas giant with a big magnetic field that shields humans from harmful rays, not sure . But again it all can be a debate, thank you for the comment!