By Pradipta Kumar Deb
An advent to Mine Hydrogeology briefly describes the topic of hydrogeology in order that this data may be built-in into mine improvement making plans. It emphasizes not just the hydrochemical but in addition the actual affects of the hydrogeological surroundings at the mine and its atmosphere. extra, it discusses the methodologies utilized in mine hydrogeological reviews, showcased by means of chosen stories on Indian mines.
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Additional resources for An Introduction to Mine Hydrogeology
As soon as the second bench is opened, groundwater seepage would take place from the static reserve in addition to the existing seepage from the dynamic reserve (Deb 1987). Further, during rainy season in addition to ground water seepage, there would be additional percolation from rainfall can be made from the following simple formula: QRF ¼ S Â Rf where QRF Flow due to rainfall within the excavated area in m3/day S Surface area of the excavated mining zone in and Rf Rainfall in meter (to be converted from mm) square meter on a particular rainy day.
Identification of potential aquifers can be made from the borehole logs. Aquifers may be sand and sandstone, limestone or Karstic limestone, highly fractured hard rocks like crushed quartzites basalt or granites. Confining materials on top and bottom of the aquifers like clay or shale beds are to be identified which acts as a confining medium and makes the aquifer confined or artesian one. For a running open cast mine, some times mine gets flooded by inrush of ground water flow hindering mining operation.
The recharge is mainly due to river flow percolations and rainfall. The recharge area has been computed to be 350–360 km2. The average annual rainfall in the area is about 1,100 mm and 15–20 % of it trickles down to the sub surface as recharge. The aquifer may be termed as a coastal aquifer as it occurs adjacent to the sea. The aquifer out crops in a NE–SW direction and it has been estimated that the length along the normal is about 30 km and the average width at right angles to normal is 12 km.
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