The impact of longwall mining on the hydrologic balance: premining data collection.
Evans GA; Hailu T; Weagraff HM; Warner JW; Lowry GS
Spokane, WA: U.S. Department of the Interior, Bureau of Mines, J0218025, 1983 Jan; :1-14
This report documents a preliminary hydrologic investigation of an area where longwall mining methods are to be used. The scope of work includes determination of physical and chemical characteristics of major soil types in the area; determination of physical and chemical properties of surface water bodies; collection of geologic characteristics, including stratigraphy, structure, and detailed aquifer descriptions; a 10-year collection of meteorological data and installation of a weather station; and a detailed ground water investigation that includes completion of observation wells, aquifer testing, water quality sampling, and analysis using a 3-d computer model. Input data from eight multiple-completion monitor wells were used to model an area of approximately 10 square miles. Two confined layers, coal and overburden, were simulated. Model results showed good agreement with known piezometric data, desaturated areas, and flow from springs.
Caving mining; Hydrology; Surface waters; Ground water; Coal mining; Stratigraphy; Meteorological data; Longwall mining; Computer applications
CP; Final Contract Report
NTIS Accession No.
OFR 187-83; Contract-J0218025
Spokane, WA: U.S. Department of the Interior, Bureau of Mines, J0218025
J. F. Sato and Associates