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<br />' Since dewatering the mine pit area is a function of not <br />only reducing water levels in the area of the mine pit, but <br />also providing this water for mine operations as needed, some <br />assumptions have been made regarding mine operation water <br />' usage to evaluate how quickly this area should be dewatered. <br />The required make-up water is estimated to be 200 gpm. Based <br />on this requirement, initial water demands may be able to be <br />' met through the dewatering operations, while ultimate demands <br />will have to be met by a combination of dewatering and <br />' providing water from other sources. <br />i For purposes of these analyses, we have as:;umed a two- <br /> to 10-yr dewatering schedule, in an attempt to bracket aworst- <br /> case and best-case scenario. <br /> <br /> It is the intent of this dewatering plan to reduce the <br />' water levels in the ore zone aquifer as stripping progresses. <br /> Therefore, the dewatering operation should be designed to <br />' maintain a water level below the level which is being stripped. <br /> Dewatering, stripping, and water usage for minin5 operations <br /> can be coordinated to yield the most effective and efficient <br /> plan. As data are developed during this period, the initial <br /> dewatering plan may need to be modified based on aquifer <br />' response to the dewatering wells and the mine's need for water <br /> supplies from this source. <br />' <br /> Initially, it is proposed to install two dewatering <br /> wells, one on the south side of the West Pit and one on the <br /> west side of the West Pit, to eliminate the artesian pressure <br /> found in these areas. Based on the flow test data, the wells <br />bl <br />t <br />i <br />d <br />ti <br />t <br />f 100 <br />h <br />ld b <br />f <br />d <br /> a <br />pro <br />uc <br />on ra <br />e o <br />gpm <br />s <br />ou <br />e capa <br />e o <br />a sus <br />ne <br /> each. The proposed locations of these two wells a-e shown in <br /> Figure G-14. These locations were selected based on the known <br /> artesian pressure in this area and the judgments that these <br />' two wells are downgradient wells from the mine pit. Therefore, <br /> these wells could not only control the artesian {pressure in <br /> <br /> G-39 <br />1 <br />