Laserfiche WebLink
<br />2.1 GROUND WATER-LEVEL CHANGES <br /> 2.1.1 SUMMARY <br /> Water-level changes in wells GD2 and GF6 are thought to be <br /> mainly attributed to natural variation in recharge to the QR <br /> aquifer. The stopping of the declines in these two wells is thought <br /> to be caused by the slightly higher precipitation the last two <br /> years (see Figure 2-1). Some of the water-level changes could be <br /> a result of mining. Water-level responses in wells GD2 and GF6 are <br /> very similar to those in well GPS, which are QR aquifer wells that <br /> are distant to any active mining in the QR seams and reflect these <br /> natural variations. Water-level changes in QR well, GA1, have <br />• continued to decline in 1990 similar to the natural decline in QR <br /> well GP1. Some of the change in well GA1 is likely due to the E <br />i and D pit mining. <br /> Upgradient mining can cause water-level rises in wells <br /> downgradient of the mining by allowing ground water to flow to the <br /> downgradient end of mining quicker. Also, the backfill aquifers <br /> are more permeable than the native aquifer which also allows ground <br /> water to flow faster through the backfill material resulting in <br /> more water to the aquifer at this location. The input of <br /> additional water to the native aquifer at the north end of the <br />-.. mining has decreased the affects mine.dewatering has had on water <br /> levels in this portion of the aquifers.. _ <br /> Levels in the backfill areas are depressed and are likely not <br /> to ever recover to pre-mine levels. Map 2-1 shows that the levels <br />2-2 <br />