By Paul L. Younger, Paul L. Younger, N. S. Robins
This publication is a set of keynote stories and special case-studies overlaying the significant components of lively learn and state of the art commercial perform within the box of mine water administration. It addresses either problems with water volume (such because the effect of longwall mining at the piezometry and hydraulic homes of overlying aquifers) and water caliber (spanning an array of websites from deep coal mines to open-pit base steel mines), in addition to a wealth of hybrid, built-in reviews within which hydrogeological and geochemical features are thought of (and controlled) together.The papers offered during this booklet are meant for training geologists and engineers focused on the administration of energetic and deserted mine websites world wide. it's also of curiosity to educational geoscientists and scholars with pursuits in low-temperature aqueous geochemistry and the hydrogeology of complicated, quasi-karstic groundwater movement structures.
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Additional resources for Mine Water Hydrogeology and Geochemistry
The steep hydraulic gradient at the edge of the panel indicates that it is the low transmissivity of the sandstone, rather than any influence of later mining to the south, that is most responsible for the lack of recovery. Geochemical results at the Saline County site. Water in the shallow drift wells off the panel was fresh (TDS <1000mgr 1 ) with mixed cations and bicarbonate- or sulphate-dominated anions. In the shallow piezometers over Panel 5 it was slightly more mineralized (TDS 600^OOmgl" 1 ), and the only apparent change due to mining was a slight increase in bicarbonate relative to sulphate.
Sulphate was almost zero in R18, and about 200mg I-1 in P350. During the post-mining recovery, the water in P350 became more brackish (TDS in the range 1990–2620mg I - 1 ) with an increase in sulphate to 800–1272 m g l - 1 (Fig. 10). Sodium increased from about 400 to about 600 m g l - 1 , but bicarbonate levels remained approximately the same. The changes were greater in P350, open through the whole aquifer, than in piezometer P411, which was screened only in the lower bench of the sandstone. Two possible sources for the increase in sulphate were identified: leakage Fig.
Slug tests of the piezometers over the panel were conducted before, after and, in some cases, during subsidence. The hydraulic results are summarized in Table 2 (Booth et al. 2000). The two shallow drift piezometers, which were screened in thin sand and gravel within 6 m of the land surface, had hydraulic conductivities in the range 10- 71 0 - 6 m s - 1 , which did not change significantly after mining. The four deep drift piezometers Table 2. 7x 10 9 l . 1 X 10 - 8 _ _ 7 7 8 8 EFFECTS OF LONGWALL COAL MINING ON AQUIFERS were screened just above the bedrock surface.