Effects of Strip Mining the Abandoned Deep Anna S Mine on the Hydrology of Babb Creek, Tioga County, Pennsylvania

摘要

Daylighting (strip mining of coal seams previously deep mined) operations are being conducted on the Anna S Mine, That underlies about 850 acres that are drained by three major discharges. The Hunter Drift drain an underground area of about 400 acres, the Anna S 1, main entry, an area of 330 acres, and Mitchel 2 discharge an area of about 120 acres. As of August 1, 1979, about 55 acres (15 percent) had been daylighted in the Hunter Drift basin, about 15 acres (5 percent) in the Anna S main entry basin and about 30 acres (25 percent) in the Mitchel basin. The acidity of the Mitchel 2 discharge changed the most, from 176 milligrams per liter (as CaCO3) in 1975-76 to 1,190 in 1978-79, an increase of 580 percent.