Laserfiche WebLink
<br />in the backfill and downgradient aquifers are close. Well pairs <br />GD3-GD2 and GF11-GF6 present water levels that are very close in <br />water-level elevation for the backfill and downgradient-QR--aquifer <br />well. <br />The rise in HI aquifer well, GBS, in 1984 through 1987 is <br />thought to be caused by higher recharge rates and recovery from <br />mine dewatering. The stabilization of water levels in 1988 through <br />1990 is thought to be caused by a decline in recharge and an <br />offsetting recovery from mining. The rise in water level in the <br />last four years in HI aquifer well, GF4, is thought to be caused by <br />recovery from mining upgradient. Water levels in this portion of <br />the aquifer could now be above pre-mine conditions due to the <br />• input of additional water just downgradient of the mining. <br />Each of the water levels in the three GE wells have been <br />recovering for several years from mine dewatering from the <br />adjacent operation. The rate of rise declined in 1988 and these <br />wells showed some stabilizing in 1989 and 1990. A decline in water <br />levels has been observed in the second and third white sandstones <br />at well GE3 during the last half of 1990. These affects are <br />thought to be due to the greater time since dewatering stopped. It <br />may also be partly attributed to lower recharge rates and/or the <br />mine dewatering that started in the C pit in 1988. <br />Water level rises were observed in 1990 in the HI and -KLM <br />wells (GP3 and.GP4) downgradient of the A pit mining... .This rise <br />• could be due to the mining but probably natural. The water level <br />in the QR well GP5 responded similarly. <br />2-3 <br />