Laserfiche WebLink
2.1 GROUND WA ER-LEVEL CHANGES • <br /> 2.1.1 SUMMARY <br /> Significant mine activities during 1999 included the continued expansion of the A <br /> and D pit areas. Mining also continued in the M and Q seams in the F (Flintlock) pit, which <br /> started in 1997. Pit D dewatering was 40.15 ac-ft in 1999, while the F pit dewatedng was <br /> 33.19 ac-ft. Dewatering did not occur in the A pit in 1999. <br /> Annual precipitation for 1999 was slightly less than normal at 15.64 inches, <br /> compared to the Trapper record and above the long-term record average (Figure 2-1). <br /> The last two years of precipitation have been near normal, relative to the Trapper average <br /> established since 1978 (see Figure 2-1). The three previous years were above the Trapper <br /> average. Recharge in this geographic setting is directly related to precipitation. <br /> The effects of natural recharge variations on the respective aquifers can be • <br /> observed in wells located in undisturbed areas away from the influence of mining activities. <br /> Well GC-3 exhibited the alluvial water level response with a gradual water-level decline <br /> due to less spring recharge in 1999. The effects on the 3rd White aquifer are observed in <br /> wells GC-2 and GP-9. These wells show a very gradual water-level decline in 1999, <br /> showing the natural response to two years of slightly below average precipitation. The HI <br /> aquifer (GC-1, GP-7) is characterized by fairly steady to gradual water level decline in this <br /> aquifer in 1999. The KLM aquifer (GP-2, GP-8) showed steady water levels in 1999 in well <br /> GP-8 and a significant decline in well GP-2. The QR aquifer water levels (GP-1) also <br /> declined significantly in 1999. <br /> Water-level increases in well GMP-1 are mainly due to the movement of Pit A to <br /> the east of this area. The gradual water-level declines in well GD-3 in 1999 are due to less • <br /> 2-2 <br />