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A significant milestone.
"Modelling that includes the increased seismic activity shows a loss-causing quake in Oklahoma could now be expected about once in seven years, compared with once in 100 years previously."
Mine voids: big party, now for the hangover July 25, 2016 SHARE Facebook Twitter Mining companies and regulators have gravely underestimated the costs of mine rehabilitation, leaving taxpayers in the gun for billions of dollars in clean-up costs, says Rick Humphries. He should know. Humphries was Ri...