Earth Resistivity Investigations in Reclaimed Surface Lignite Mine Spoils.
For Reference Only At Bureau Libraries :98 pages
Earth resistivity surveys using the wenner electrode configuration were made in unmined areas and reclaimed spoils at three surface lignite mines in western North Dakota. Automatic interpretation of the curves was accomplished with the method of zohdy and bisdorf. Overburden materials become more homogeneous with respect to resistivity during the mining and reclamation process. The spoils curves show localized heterogeneities probably related to discontinuous moisture content variations in the spoils. Consistent resistivity differences in spoils occur between mines with overburdens of different mineralogic compositions. Ground water chemical compositions in terms of total dissolved solids (tds) is inversely correlated with apparent resistivity at the 80-ft spacing from a survey centered at a piezometer screened near the base of the spoils. Better inverse correlation is probably prevented by high variability in tds within the spoils ground water. A useful predictive relationship may be the plot of mean apparent resistivity at the 80-ft spacing for an entire mine against mean tds for all wells in spoils at that mine.
CP; Final Contract Report;
For Reference Only At Bureau Libraries
North Dakota Geologic Survey