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Figure 58B. 5 Mine Well <br />Conductivity <br />~ 1600 <br />U <br />cn 1400 <br />0 <br /> <br />~ 1200 <br /> <br />~ 1000 <br />, <br /> <br />-~. 800 <br />} <br />U <br /> <br />~ 600 <br />c <br />0 <br />U 400 <br />Jan-81 Jan-83 Jan-85 Jan-87 Jan-89 Jan-91 Jan-93 <br />Date <br /> <br /> <br />m <br />W <br />• ~ • <br />