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Carol Russell -2- Alarch 17, 1982 Overburden-Temporar^ Stockpiles and material Balance Zn response to comments in our Preliminary Adequacy Review, the applicant has amended the application text and tfap No. IS of the application to provide additional detail concerning material moverent during the proposed mining sequence. However, cahile this represents a significant improvement over earlier submittals, some additional information will he necessary in order to verify the applicant's projections of post-mining topography. On cage 2.05-22a the applicant observes that 1/3 of temporary stockpile No. 1 (155,000 cubic yards) was originally derived from Dorchester's adjoining surface facility area and should be returned to that area in order to complete reclamation of both sites. The applicant should provide proof of agreement with Dorchester to accomplish this transfer of material at the appropriate time. Further, no mention is made of the final disposition of the remaining 2/3 (310,000 cubic yards) of the material reported to be in temporary stockpile No. 1. On page 2.05-22b, the applicant observes that 3/5 of temporary stockpile No. 2 (234,000 cubic yards) will be backfilled into the final pit area of the "current pi.t area" at the end of 1982. However, no discussion of the final disposition of the remaining 2/5 (155,000 cubic yards) of the material in temporary stockpile No. 2 is made within the amended permit documents. Further, the amended hermit annli~cation commits to the reconfiguration and reclamation of additional disturbed areas, such as the tdagpie Creek drainage near the "North Pit" and the Unnamed drainage between the "Current Pit" and "East Pit" ridges. However, no material balance information is presented to indicate the material reeuirements involved in completing this reclamation of these previously disturbed areas. Zn order to completely define the projected movement of overburden and inter- burden material within the proposed mining operation, the applicant should further detail the quantities of material involved. A complete discussion of overlooked portions of temporary stockpile No. 1 and No. 2 should be included within the application. Further, Map No. IS should be amended to indicate logical areas of disturbance, including Afagpie Creek and the Unnamed drainage betcieen the "Current Pit" and the "East Pit" ridges. Material cal- culations should be presented for each of the areas designated, including arrows indicating movement of material, such as those used in the most recent amendment of A1ap No. 15. Zn addition, a tabulated material balance, presented bu area and scheduler] ti rung, would be extremely helpful. The objective of presenting this material balance is to demonstrate to our satisfaction that the proposed post-mining topographic configuration correctly accommodates the materials derived during the mining operation. This material balance [vi 11 also be extremely useful in determining appropriate bonding amounts during various periods of the permit span.