Equip the mission specific gun, Miss Moxxi's Grog Nozzle. Aim and fire on any of the Dwarf Miners in the area. When you hit them with this gun they will become a Drunk Dwarf which will be chasing you.
Lure them up to the Mining Equipment and then hit the green button just off to the side of it. Timed right it will crush any dwarves between its presses.