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Exhibit D <br /> MINING PLAN-2013 Revision <br /> Owl Canyon Quarry <br /> Mining will be accomplished in three phases or Mining Areas as outlined below, with stripping, back- <br /> filling and quarrying going on simultaneously within the 276 permit acres. Mining Area A (the current <br /> mining area) is divided into blocks to further delineate progress within the quarry.These blocks were <br /> developed using both current and projected mining rates, and are subject to change based on market <br /> conditions. Planning for efficient and timely reclamation work also contributed to the revised mining <br /> sequence. Mining will progress to each of the next phase (Mining Areas B and D) as previously mined <br /> and reclaimed acres are released. <br /> The overburden material consists of sandstone rock, containing 50%Si02 and 50% CaCO3.This material <br /> does break up and will generate considerable fines which will aid in subsequent revegetation.The <br /> underlying bed is again sandstone rock with the same chemical composition as that of the overburden. <br /> The parting plane between the limestone and the underlying sandstone is clearly defined, which result <br /> in a smooth hard floor after the limestone is removed.This would be very close to the existing terrain <br /> which is rock outcropping but in order to enhance reclamation, overburden will be placed over the bare <br /> rock to promote revegetation. <br /> Conventional open pit quarrying methods will be used in this operation. Both the sandstone overburden <br /> and limestone will be drilled and blasted.The shot rock will then be loaded and hauled to the crushing, <br /> screening, and stockpiling area. Necessary roads will be constructed as required to provide the access to <br /> the mining operations.The roads will be constructed primarily with the overburden material and <br /> covered with 3" to 12" of W minus limestone or sandstone. Roadways will not need to be constructed <br /> outside the disturbed area and will be graded, covered, or scarified to facilitate revegetation. <br /> Mining Area A <br /> This is the current mining area and will remain open until the year 2022, depending on demand for <br /> material. Limestone and sandstone will be removed.This will be accomplished by conventional open pit <br /> drilling and blasting methods. Limestone is being loaded and hauled to the crushing and stockpile area <br /> for processing and sizing. Sandstone and recoverable dolomite are loaded and hauled to the crushing <br /> and stockpile area for processing, or to back fill areas. <br /> The total area has been divided into smaller areas numbered Al, A2, A3, and A4.Stripping and quarrying <br /> will progress through those areas in that sequence, unless demand or market conditions change. <br /> Overburden from current operations is being backfilled in Back Fill Area I (BF 1) <br /> Subsequent Back Fill Areas are numbered BF II through BF XII and maintain the same boundaries as <br /> Mining Area Al through A4. Once Back Fill Area, BF I, is full and the area contoured for reclamation, <br /> Page 1-Owl Canyon 2013 Revision <br /> D-1 <br />