21. Mild amounts of acid mine drainage affect the West Branch and its tributaries. 22. The Tioga River's acidity is caused by acid mine drainage . 23. During this time period acid mine drainage ( AMD ) began contaminating Leviathan Creek. 24. Many of these tributaries are affected by acid mine drainage . 25. There, acidic mine drainage containing toxic metals is projected to go on for centuries. 26. There are six locations in the Solomon Creek watershed where mine drainage is discharged. 27. Many abandoned mines throughout Colorado are known to have problems with acid mine drainage . 28. The acid mine drainage came from mines in and near the city of Hazleton. 29. Acid mine drainage is caused by both abandoned mines and mines in current excavation. 30. They would be suitable for relatively small flows or less complex acid mine drainage .
