1989-12-18_REVISION - M1988112 (8)

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~, Exhibit G, Water Resources 47. The water balance identifies the three (3) sources of water to be obtained from: (1) offsite, (2) recycled tailings slurry, and (3) pit dewatering. The offsite supply is dependent upon a water court decision on change of use yet to be finalized. Aplan-for-augmentation is also a part of this ruling. A second court case is pending to adJudicate nontributary water. At this time, please discuss the following for clarification purposes: a. As the tailings disposal area is to be lined and designed to recycle incident precipitation from a 205 acre area, is this amount of water considered in the plan-for-augmentation or temporary substitute supply plan? b. How is the amount of moisture retained in the tailings considered from a water rights perspective? Exhibit L, Reclamation Costs 48. Based upon Exhibit D and Figures C-11 and C-13, it would appear that a point of maximum disturbance within the tailings disposal facility is reached near the end of the life of the facility. At that point in time, the configuration of the tails is such that a slope toward the center of the facility has been created. Please include an estimated cost to grade the entire facility to achieve a 1.5~ grade toward a central, armored ditch. which would convey water off the facility surface to the spillway. 49. Clearly describe how topsoil will be transported and placed on the graded tailings and slopes of the embankments. For purposes of the cost estimate, we will assume that the topsoil will be placed by machinery. 50. In order to graded the facility, it would be necessary to allow tailings to dry so that equipment could work efficiently. Please include the cost of dust control during the grading of the facility. Please provide an approximate square footage of the mill facility for purposes of estimating its removal cost. 51. Please include the costs of continued monitoring of the wells, piezometers and leak detection system (including water levels, obtaining, preparing and analyzing samples) for a period of at least five years after site reclamation is complete. Please include the cost to remove the 48 inch culvert from the south embankment. 52. The cost to deliver and place riprap in the collection pond upon site reclamation should be included. /ern 2353E -7-