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addition of alkaline alkaline solids bed volumes bentonite Bob Bay Bureau of Mines cattails chemical equilibrium chemical release cobalt copper and nickel drainage pH drainage quality drainage treatment Dunka effluent Eger and Lapakko examined exceeded Figure gabbro greenstone hydraulic conductivities Hydrology hydroxide inches indicated input iron sulfides laboratory experiments Lapakko and Antonson Lapakko and Eger leachate leaching liner magnesium hydroxide mass release mesh limestone mg/L mining wastes Minnesota minus 2.5-inch mitigation MN Dep neutralization potential neutralizing agent nickel concentrations nickel removal oxidation peat percent sulfur Precambrian produced drainage quality of drainage quantified Reclamation Regional Copper-Nickel Study release rate report Eger report Lapakko RK fines runoff samples scale field Sedimentology Seep sodium hydroxide solid phase stockpile capping stockpile drainage Strudell sulfate sulfide minerals sulfur content taconite tailings tions trace metal concentrations Trace metal removal treatment efficiency Unnamed Creek waste drainage waste rock stockpiles wetland treatment zeolite