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Exhibit D .. MWING PLAN-1999 Technical Revision ~. °• Rex Qtrarry Mining will be accomplished in three phases or Mining Areas as outlined below, with stripping, bacldilling and quarrying going on simultaneously. Mining Area A (the curtent mining area) is divided in to five (5) year blocks to further delineate progress within the quarry. These blocks were developed using both current and projected mining rates and are subject to change based on market conditions. Planning for efficient and timely reclamation work also contributed to the revised mining sequence. Mining will progress to each of the next phases (Mining Areas C and D) as previously mined and reclaimed acres are released. The overburden material consists of sandstone rock containing 50% SiO2 and 50% CaCO3. This material does break up and will generate considerable fines which will aid in subsequent revegetation. The underlying bed is again sandstone rock with the same chemical composition as that of the overburden. The parting plane between the limestone and the underlying sandstone is clearly defined, which results in a smooth hard floor after the limestone is removed. This would be very close to the existing Certain which is rock outcropping but in order to enhance reclamation, overburden in the form of broken rock will be placed over the bare rock to promote revegetation.. Conventional open pit quarrying methods will be used in this operation. Both the sandstone overburden and limestone will be drilled and blasted. The shot rock will then be loaded and hauled to the crushing, screening and stockpiling area. Necessary roads will be constructed as required to provide access to the mining operations. The roads will be constructed primarily with the overburden material and covered with 3" to 12" of '/1' minus limestone or sandstone. Roadways will not need to be constructed outside the disturbed area and will be graded, covered or scarified to facilitate revegetation. Mining Area A. This is the current mining area and will remain open until the year 2043 depending on demand for material. Limestone and sandstone will be removed. This will be accomplished by conventional open pit drilling and blasting methods. Limestone is being loaded and hauled to the crushing and stockpile are for processing and sizing. Sandstone and recoverable dolomite are loaded and hauled to the crushing and stockpile area for processing or to back fill areas. The total area has been divided into smaller areas numbered Al, A2, A3, A4, A5. A6. A7. AS. A9, Cl, C2 and C3. Stripping and quarrying will progress through those areas in that sequence unless demand or market conditions change. Overburden from current operations is being backfilled in Back Fill Area I (BF I) Subsequent Back Fill Areas are numbered BF Q through BF XIII and maintain the same boundaries as Mining Areas Al through C3. Once Back Fill Area, BF 1 is full and the area contoured for reclamation, backfilling will proceed to BF II and then BF ID, BF IV, BF V, BF VI, BF VII[, BF IX BF X BF Xl. BF 7QI and BF XIII. The general plan is to have backfilling and reclamation occurting as closely behind quarrying as possible. While overburden is being removed from IvLning Area, A2, backfilGng will be taking place in Back Fill Area, BF R. Bacldilling will move to BF ID after Mining Area A2 is depleted and progress through the Mining Areas, A3 through A9 as they are depleted. Mining Area C. Once Mining Area A is depleted and enough acres from that area have been released to keep the overall disturbance within bonding limits, stripping and quarrying will move to the outh end of Mining Area C and then proceed Northward in areas C 1, C2 and C3. ARer Back Fill Area, BF X has been filled, backfilGng will move to the South end of Mining Area C and follow the quarrying Northward. Overall depths of overburden will vary but a minimum depth of two (2) feet will be maintained to provide a sufficient base for vegetation. Mining Area D. Additional reserves within the permit boundary are outlined in Mining Areas D (probable reserves). These reserves will be evaluated and mined as previously mined acres are reclaimed and released from the Reclamation Bond.