Laserfiche WebLink
The water quality in HI aquifer well GP -3, which is close to the reclaimed A pit, has not <br />been influenced by mining. TDS concentrations were steady for the last few years in well GF -4 <br />after a slight increase for several previous years. This small change may be due to mining but is <br />within natural variations for this aquifer. The water quality in HI well GMP -1 likely has been <br />affected by mining. Its concentrations were within the range of natural concentrations until the <br />increase in the last eleven years. The water quality in HI well GC -1, downgradient of the mining in <br />this area, increased in 2005 but returned to previous level in 2006 through 2017. The water quality <br />in HI well GP -7, which is east of the areas mined, has not been affected. The TDS for the first <br />sample in 2014 for well GP -7 seems to be an outlier based on the values measured in 2015 through <br />2017. The TDS from the new HI aquifer well GLEV-3 indicates the natural level in this aquifer can <br />be higher at some locations. <br />The 3rd White Sandstone wells GC -2 and GP -9 are downgradient of mining starting in 2000 <br />and changes in water quality in these wells in 2017 are similar to previous natural changes. TDS in <br />3rd White Sandstone well P-8 were large in 1996 through 2017 and the magnitude and timing of this <br />increase makes it likely that it was caused by upgradient mining in the A pit. <br />The 2nd White Sandstone well P-5 contained enough water to be sampled once in 2017. The <br />2017 TDS value falls within the range of historic values. <br />Significant changes in TDS concentrations have been observed in the alluvial wells GC -3, P- <br />1, J-1, and COY. The changes in the Flume alluvial wells had to be natural prior to 2000, while <br />some of the changes in J-1 water could be due to mining. Overall, the TDS for J-1 were higher than <br />normal from 2000 to 2017 and is slightly higher than the natural levels in the COY alluvial well. <br />The variations in 2017 TDS in Pyeatt alluvial well P-1 are slightly higher than natural levels <br />observed for the alluvial aquifers and could be slightly affected by mining. The full range of TDS in <br />Trapper Mining Company 6-4 <br />2017 Annual Report <br />