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• 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 OR <br /> aquifer. Some of the water-level changes could be a result of <br /> mining . The water-level declines in these wells relates to the <br /> lower precipitation rates at the Trapper Mine (see Figure 2-1 ) . <br /> Water-level responses in wells GD2 and GF6 are very similar to <br /> those in wells GP1 and GP5, which are OR aquifer wells that are <br /> distant to any active mining and reflect these natural variations. <br /> Water-level changes in OR well , GA1 , have responded similarly , but <br /> • some of the change in this well is likely to be caused by E pit <br /> 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 <br /> ground water to flow faster through the backfill material <br /> resulting in more water to the aquifer at this location . The <br /> input of additional water to the native aquifer at the north end <br /> of the mining has decreased the affects mine dewatering has had <br /> on water 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 /> • in the backfill and downgradient aquifers are close. Well pairs <br /> 2-2 <br />