Issue Date: January/February 2011


 GEOSTRATA, 2011, January/February, 44-50   “Plan B” worked! At 8 a.m. on Saturday, October 9, 2010, drillers from Kansas City-based Layne Christensen Company broke through into a remote gold and silver mine in northern Chile with a 26-in.-diameter hole, winning the three-way race to reach the 33 miners trapped 2,300 ft below ground since August […]

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Categorized as: Tunneling