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US Steel Minntac Tailings Basin

This study compares sulfate concentrations and mass in rivers to those in the Minntac Tailings Basin in US Steel. Observations from the past two decades and seep flow rates are analyzed. Seepage Collection and Return System data are considered for accuracy.

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US Steel Minntac Tailings Basin

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  1. US Steel Minntac Tailings Basin 1 mile

  2. Observed Average Sulfate Concentration and Mass in Rivers and Seeps Average Sulfate Mass • Calculations are based on observations from approximately 2000 to present except for the Dark River Stream which are from 3 measurements from November 2011 to September 2012 • * 545 gpm at conc of 811 mg/L (Flow from Table 6.2 "Simulated Versus Estimated Seep Flow Rates and Groundwater Discharge Rates" - CRA June 2013 Report:) • SCRS = Seepage Collection and Return System

  3. Comparison of Observed Sulfate Mass in Rivers to Basin Seepage Estimates

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