2013-11-12_REVISION - M1977302 - Laserfiche WebLink

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Exhibit D MINING PLAN -2013 Revision Owl Canyon Quarry Mining will be accomplished in three phases or Mining Areas as outlined below, with stripping, back - filling and quarrying going on simultaneously within the 276 permit acres. Mining Area A (the current mining area) is divided into 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 phase (Mining Areas B 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 result in a smooth hard floor after the limestone is removed. This would be very close to the existing terrain which is rock outcropping but in order to enhance reclamation, overburden 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 the access to the mining operations. The roads will be constructed primarily with the overburden material and covered with 3" to 12" of W 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 2022, 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 area 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, and A4. 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 1) Subsequent Back Fill Areas are numbered BF II through BF XII and maintain the same boundaries as Mining Area Al through A4. Once Back Fill Area, BF I, is full and the area contoured for reclamation, Page 1-0.1 Canyon 2013 Revision D -1