Aug. 17, 2012
At dawn, miners line up to take a bus to the mines of the Rich Mountain in Potosi, Bolivia. There are 600 mines, according to veteran engineer Nestor Rene Espinoza, and 65 miles of tunnels. His study, which was unveiled in August, showed that five large areas of the mountain’s upper levels have a high risk of collapse. The best solution, he said in an interview, is to pump cement into the abandoned shafts, an operation that would cost at least $300 million and take more than a year.
For The Washington Post