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-28- <br />trending faults which are located along the southwestern Paradox <br />Valley side. Some of these faults are expected to have a potential <br />for slow creep deformation. Evidence of creep has not been observed <br />along the mine faults since mining was started in 1976, indicating <br />that the mine faults are probably stable or their movement is <br />extremely slow at the present time. <br />The northeastern mine fault crosses through the leaching plant <br />site at the approximate location shown on Fig. 2. Based on the field <br />evidence, we judge that the probability of landslide or fault <br />deformations to be very low within the operating life of the leaching <br />facility. Because of the potential for future small scale surface <br />movements, we recommend that some precautionary measures be taken at <br />the plant site. Retention berms are recommended around facilities <br />where spillage could occur. it is recommended that subsurface piping <br />be minimized. If it is necessary to have subsurface piping, the <br />operator should be aware that damage may occur as a result of <br />differential ground movements. The plant should be periodically <br />inspected with this in mind. A system of check valves should be <br />provided so that in the event of a pipe break, leakage could be kept <br />to a minimum. <br />Our analysis of the earthquake exposure for the short term <br />operation of the plant indicates that the plant may be subjected to <br />shaking associated with small to moderate sized earthquakes. <br />tructures should be designed for earthquake loads in <br />with Seismic Zone 1 of the Uniform Building Code. <br />of stockpiles and earth embankments can be evaluated using a <br />Eficient of 0.025g. <br />