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floor of the Bear and Edward_c Mines for more than 2 milts withotn undergoing <br />substantial cooling. This is very unlikely becaux: 1}temperature measurements of water <br />in the wEM clearly demonstrate that thermal groundwater, even when buffered against <br />tempenttae loss by large volumes, quickly cools 10 to 20 °F in the mine environment, <br />and 2) there is no evidence for heating in the bear or Edwards Mixes. The 5ra fault <br />` water stored in the NW Panels sealed sump, BEM fault water, had a discharge <br />temperature only 3 °F greater than the discharge temperanue of Edwards Mine portal <br />spring wazer. This BEM fault water most certainly underwent some cooling prior to <br />storage is the NW Panels sealed sump wad may have undergone some cooling during is <br />the Nw Panels sealed camp. <br />The temperature of water discharging from the Edwards Mme portal spring requires a <br />heating source. In the WEM we found that fault-related thermal groundwater dixharges <br />originate in the uppermost sandstone horizon of the Rollins Sandstone. It is platuible that <br />a similar faalt mechanism in Tither the Bear or Edwards Mmes is the source of thermal <br />discharge from the Edwards Mme portal spring. Such a fault source could easily have <br />ban overlooked during mining operations because the volume of water discharging from <br />the Edwards Portal spring is small. <br />Respectively submitted, <br />~ Alan L~yo, PhD., RG, PH <br />x ICidc Mueller <br />Ica~y wilt <br />~~•vCsad« ason~ <br />• <br />