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Locating and Abating Sources of Acid Mine Drainage At Reclaimed Strip Mines.
Proceeds 1990 Mining & Reclamation Conf & Exhibition West Virginia Univ Pub Serv 1990 2:1 pages
Surface and ground water pollution is a common problem associated with post-surface-mining operations and can lead to many costly problems such as (1) a long-term treatment commitment, (2) sludge disposal, (3) re-excavation and relocation of acid-producing materials, (4) forfeiture of bond monies, and (5) bankruptcy. The U.S. Bureau of Mines is studying a reclaimed strip mine in Upshur County, West Virginia, with the objective of developing an effective, economical, and permanent method that abates postmining water pollution problems. Historical water quality, terrain conductivity, and flow data from this site, dating back to 1983, supplement more recent hydrologic baseline data. Magnetometry, which has recently been proven capable of locating some types of acid-producing materials by means of magnetic anomalies, was used to target grouting efforts. A thin cement and fly ash slurry (density of about 87 lb/cu ft) was injected under pressure into boreholes as a means of infusing the entire target zone. The magnetic properties associated with the fly ash also served as a tracer for identifying slurry propogation through the use of postgrouting magnetometry surveys. As the result, the grouted zones of acid-producing materials were transformed into a relatively impermeable and inert mass of subsurface material. The long-term water quality monitoring of the existing 12 wells and surface seep will be used to evaluate the effectiveness of this water pollution abatement technique.
Proceeds 1990 Mining & Reclamation Conf. & Exhibition. West Virginia Univ. Pub. Serv., V. 2, P. 503
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division