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' ~ 6. 1 r Comment: The applicant states that a series of conveyors will be used for the mining operation. Please indicate the location of the conveyor(s) and provide designs for the ground level conveyors and elevated conveyors. In addition, the conveyor corridor between Phases I and II will need to be noted as "affected azea," and depicted on the appropriate exhibit. Response: Exhibit "C-3" depicts the conceptual conveyer alignments for the Lyons amendment as well as the existing conveyor alignment, which is approximately 4,000 feet in length. To the existing conveyor system, WMI will add approximately 2,500 feet of portable conveyor. Because WMI's Lyons conveyor system is totally portable, there are no permanent structures needed to extend the existing conveyor system to serve the amended area. ~7 Comment: During the pre-operation inspection of August 20, 1999, the apphcant indicated that the mining sequence would be different than what was submitted to the Division. Please revise the exhibits to reflect the proposed sequence of mining for the Lyons Pit. Response: The current mine sequence for the amended Lyons permit is as follows: • Fvst, Phase I, Stages 1-6 • Second, Phase II, Stages I-2 • Third, Phase III, Stages 1-4 • Fourth, Phase II, Stages 3-7 See Attachment #3 (Exhibit "C-3"-Mining Plan, Map Notes) for / revised mining sequence. ' J8. Comment: Please identify the nature of the stratum immediately beneath the material to be mined. Response: Lyons Pit bedrock is identified as follows: • Pierre Shale (east end) • Niobraza Shale (center section) • Carlile Shale (west end) ~9. Comment: Exhibit 3-C depicts the location of tests holes, and indicates the thickness of overburden and gravel. Will azea be mined to the gravel depth depicted by the test bole? ' DMG Adequacy Review Response Page 3