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1 <br />' Battle Mounuin Raourca, lnc. L1? Permit Modification <br />' INTRODUCTION <br />' This permit modification is being submitted for the San Luis Project by Battle Mountain Resources, <br />Inc. (BMRn for review by the State of Colorado, Division of Minerals and ,Geology, Office Of <br />Mined Land Reclamation (The Division). The modification addresses a change in waste rock <br />' disposal plans to include partial backfilling of the West Pit to a level which will $Ilow free drainage. <br />The improved plan results in eliminating one waste rock disposal area, reducing the size of another <br />' waste rack disposal azea and providing temporary waste rock storage at a third disposal area before <br />eventual removal and placement in the pit. All other aspects of the approved $an Luis permit, as <br />amended, remain the same. <br />' The San Luis Project Permit, File No. M-88-112, was issued on March 22, 1989. The permit <br />' called for the beneficiation of 13 million tons of ore, 6.5 million tons through !a conventional mill <br />circuit and 6.5 million tons through cyanide heap leaching. In Novemb$r, 1989, a permit <br />amendment was submitted which eliminated the heap leaching operation and ez~anded the scope of <br />the milling operation to include all the ore. The 1989 amendment was approved in Mazch, 1990. <br />The approved permit boundary will not change as a result of this permit modification. The size of <br />' certain waste rock disposal facilities has been revised as shown on revised Fig re C-1 included in <br />Exhibit C. Overall net disturbance of land will decrease as a result of the mo~ificadon. <br />' Mining will continue in the West Pit as discussed in Section D.2 of the approv~rl permit, however, <br />the scheduling of waste rock disposal will change in order to partially bat;kfill the West Pit <br />' concurrent with mining operations. Prior to commencement of pit backfilling, same waste rock will <br />be temporarily stockpiled in preparation for backfilling after the completion oP~ mining operations. <br />' Pit backfilling eliminates the long-term stability concerns associated with the south wall adjacent to <br />the Rito Seto. <br />' Six waste rock disposal areas were approved in the 1989 amendment, Proposed pit backfilling will <br />decrease the amount of waste rock that would be disposed of on the surface. A$ a result, the South <br />' Waste Rock Disposal Area will be reduced in size from 125 acres to 50 acres. Waste Rock <br />Disposal Area A, originally designed to cover approximately 19 acres, will the eliminated. The <br />stockpiling of waste rock on Waste Rock Disposal Area B will temporarily inFrease the height of <br />' the waste pile until this material is removed for backfilling in the West Pit. Thy revised waste rock <br />disposal azeas aze shown on Figure C-1. The waste rock disposal azea design cfManges aze discussed <br />' in Section D.3 of this document. <br />' ay L )ect o. <br />1 <br />