The geophysicists went on to conduct a second test in an abandoned coppermine in Arizona, using 25 iron plates spaced at various intervals in tunnels up to 45 metres below ground.
In 2003, Angulos was driving excavation equipment in a large coppermine when he felt a rush of air.
2003年，安格洛斯在一个大型铜矿矿山驾驶采掘设备时，突然感到了一股气体扑面而来。
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Mining minister Laurence Golborne said miners would start being individually evacuated 68 days after the collapse of part of the gold and coppermine in the Atacama desert.