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Acid Mine Drainage Prevention & Water Management Checklist

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Verify acid-generating material characterization, drainage controls, and treatment for a mine site to prevent and manage acid mine drainage (AMD) and metal leaching.

Clean Water Act NPDES40 CFR 434State AMD PermitsGARD Guide

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Geochemical Characterization

  • Has acid-base accounting (ABA) and/or humidity cell testing characterized the acid-generating potential of waste rock and tailings? *
  • Are potentially acid-generating (PAG) and non-PAG materials segregated and tracked? *
  • Is metal leaching potential assessed in addition to acid generation? *

Source Controls

  • Are PAG materials encapsulated, covered, or subaqueously disposed to limit oxygen and water contact? *
  • Is clean run-on diverted away from mine waste and contact water contained separately? *
  • Are alkaline amendments or blending used where appropriate to neutralize acid generation? *

Water Collection & Treatment

  • Is contact water collected and routed to treatment (active or passive) before discharge? *
  • Is treatment sized to meet effluent limits for pH, iron, manganese, and total suspended solids? *
  • Are treatment residuals (sludge) managed and disposed of appropriately? *

Monitoring & Discharge Compliance

  • Are NPDES-permitted outfalls sampled at the required frequency for permitted parameters? *
  • Is upstream/downstream and groundwater monitoring conducted to detect AMD impacts? *
  • Record the most recent discharge pH result. *
  • Are exceedances reported and corrective actions documented? *

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