They did not use a magnet to get the broken drill bit out. In fact they had to manufacture on site what they call a spider drill. It had a open spiral teeth design at the end of the drill, to try to surround the bit. Using the pressure of the down force, the teeth would collapse on itself and capture the drill bit.
Mamani recalls that the land the mine is located was Bolivian and was taken by Chile in 1881. He references the War of the Pacific (1879-1884), between Chile and an alliance between Peru and Bolivia. However, in common discussions about this subject, Chileans and Bolivians would reference the year 1879, when it began, instead of 1881.