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natural variations for this aquifer. The water quality in HI well GMP -1 may have been affected by <br />mining. Its concentrations were within the range of natural concentrations until the increase in the <br />last seven years. The water quality in HI well GC -1, downgradient of the mining in this area, <br />increased in 2005 but returned to previous level in 2006 through 2012. The water quality in HI well <br />GP -7, which is east of the areas mined, has not been affected. <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 2012 are similar to previous natural changes. TDS in <br />3rd White Sandstone well P -8 were large in 1996 through 2012 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 2n White Sandstone well P -5 did not contain enough water to sample this year. The <br />2011 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 2012, but is very similar to the natural levels in the COY alluvial well. The <br />variations in 2012 TDS in Pyeatt alluvial well P -1 are thought to be natural because they are similar <br />to those observed prior to mining in this drainage. <br />Sulfate concentrations in well GF-4 were fairly steady in 2012 while the sulfate <br />concentrations in well GD -3 increased in 2010 and 2011 prior to a decrease in 2012. Sulfate <br />concentration in well P -8 had decreased in the last eleven years prior to a small increase in 2012. <br />Concentrations have overall been steady in well GF -11 for the last six years after declining from a <br />peak. Sulfate concentrations have overall increased during 2006 through 2012 in well GMP -1. <br />Sulfate concentrations in well GF -7 were variable but overall steady for the last few years at a level <br />Trapper Mining Company 6 -4 <br />2012 Annual Report <br />