. Earth tones-- : the book : federal science for sustainable development . While mining companies collect and treat effluents and seepage from operating mines by using acid-neutralizing materials, such as calcite or lime, they can't continue to neutralize the acidic run-off that can persist for hundreds of years after mine closure. Operating treatment plants indefinitely isn't feasible, in part because they would generate an unmanageable volume of sludge. To find a solution, the Mine Environmental neutral Drainage (MEND) program was established in 1989 to develop scientifically based technolog
. Earth tones-- : the book : federal science for sustainable development . While mining companies collect and treat effluents and seepage from operating mines by using acid-neutralizing materials, such as calcite or lime, they can't continue to neutralize the acidic run-off that can persist for hundreds of years after mine closure. Operating treatment plants indefinitely isn't feasible, in part because they would generate an unmanageable volume of sludge. To find a solution, the Mine Environmental neutral Drainage (MEND) program was established in 1989 to develop scientifically based technologies to combat acidic drainage. Over the next 10 years, provincial and federal governments, together with the Canadian mining industry, spent over $ 17 million to reduce the costs associated with site clean-up by $400 million. Collaborative research has resulted in over 200 projects. Since it is difficult to stop seepage once sulfide mineral begins to react, prevention is the best strategy. ( J i .
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