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r~ <br />Orchard Valley Mine <br />"1988 Semi-Annual Subsidence Report" <br />page 2 <br />Monitoring <br />Station No. <br />58 <br />66 <br />201 <br />202 <br />203 <br />204 <br />205 <br />206 <br />207 <br />208 <br />209 <br />17 <br />218 <br />219 <br />220 <br />221 <br />222 <br />223 <br />Vertical <br />Movement <br />+0.25' <br />+0.30' <br />+1.01' <br />+0.88' <br />+0.90' <br />+0.80' <br />+0.92' <br />+0.89' <br />+0.92' <br />+0.92' <br />+0.86' <br />+0.60' <br />+0.75' <br />+0.78' <br />+0.80' <br />+0.59' <br />+0.86' <br />+0.87' <br /> <br />Control <br />Station No. <br />210 +0.35' <br />211 +0.38' <br />212 +0.43' <br />213 +0,40' <br />214 +0.34' <br />215 +0.33' <br />216 +0.42' <br />217 +0.38' <br />TEMP-3 <br />306 <br />250 <br />In reviewing the above data I suspect that either an error in location of the <br />control station survey occurred, or the control monuments have moved due to <br />some other influence. In either case I recommend that we require CWI to <br />verify the survey elevations for control stations 46, 250 and 306, in order to <br />determine whether the documented subsidence movements are apparent or actual. <br />Considering the current status of mining at the Orchard Valley Mine, I do not <br />believe the resolution of this question to be an urgent matter. Verification <br />survey of these monuments can be completed next spring or summer, as melt off <br />of the snow cover allows. <br />cc: Sue Mowry <br />