Laserfiche WebLink
less than its maximum level in the early 1990's. Sulfate in wells GD -3, GF -7, GMP -1, GF -11 and P- <br />8 have likely been affected by mining while the remainder of the increases could be from natural <br />variation, mining or a combination of both. <br />The pH values for all of the Trapper wells are within the range of natural values for these <br />aquifers. The pH values for the four backfill wells are within the range observed in the other <br />aquifers. <br />High SAR values are naturally common in the Trapper ground water. Mining does not seem <br />to have affected the SAR values at this site. Sodium values at well GF -7 have varied significantly <br />but, overall, have been fairly steady over the last few years. <br />The minor constituent variations have been erratic. No changes in these constituents are <br />thought to be attributed to mining. The 2012 radium 226 concentrations have been small and the <br />variations in radium 226 concentrations are thought to be natural. <br />6.2 SURFACE WATER <br />Peak flows for the surface water sites at Trapper Mine in 2012 were generally early in the <br />year and higher than expected for a low precipitation year. The precipitation in 2012 was 10.70 <br />inches, or below the 35 -year average for the Trapper Project of 16.49 inches. The previous seven <br />years of annual precipitation to 2005 had been below normal precipitation prior to the larger <br />precipitation in 2005 through 2011 and then the very low precipitation in 2012. No failures or <br />monitoring site problems were encountered during 2012 and no compliance limits were exceeded in <br />2012. <br />Values of total suspended solids (TSS) were generally on the low side of ranges observed in <br />previous years. Total dissolved solids (TDS) were generally in an indirect relationship with flow rate <br />Trapper Mining Company 6 -5 <br />2012 Annual Report <br />