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2008-12-30_PERMIT FILE - C1982057A (2)
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2008-12-30_PERMIT FILE - C1982057A (2)
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Last modified
8/24/2016 3:39:19 PM
Creation date
3/20/2009 9:34:45 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1982057A
IBM Index Class Name
Permit File
Doc Date
12/30/2008
Section_Exhibit Name
Tab 19 Reclamation Schedule
Media Type
D
Archive
Yes
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spoiled ahead of the operation and rehandled during the next cut. The result is an area on each side <br />of the box cut that is disturbed twice during the excavation process, and cannot be final graded until <br />excavation advances away from the box cut area. Surface mining with a dragline progresses in a <br />logical repetitious sequence: the dragline opens a pit (uncovers/exposes coal), the overburden is <br />placed in the previous mined pit, the coal is removed, the current highwall is drilled and blasted, the <br />dragline begins again and uncovers another pit width of coal. This process is repeated until all the <br />coal has been recovered. This mining process/sequence does not allow more than one pit width to <br />be open at a time. There may be single pits open in more then one mining area, but physically there <br />can't be more than one pit width open in a single mining area. However multiple spoil ridges may be <br />present in each mining area depending on the reclamation (rough grading) sequence. Further <br />discussion of this situation is presented in Tab 12 and 20. In order to achieve the designed <br />postmining landform, the necessary backfill material must be available to perform area grading on <br />internal spoil. Generally, adequate material will not be available until mining has resulted in <br />development of at least two spoil ridges behind the advancing pit. Tab 20 discusses the area grading <br />concept. When the pit configuration is regular (e.g., typically, interior spoil), and where sufficient area <br />is available to perform "area grading", SCC will conduct backfilling and grading activities on areas <br />beyond two spoil rows from the active pit. Typically, it will take approximately 90 to 120 days to rycle <br />the dragline from one end of the coal field and back during the permit term; however, due to coal <br />market and operation considerations, it is periodically required to also rycle the dragline from the <br />south to the north and back. This could add 60 to 90 days to the dragline rycle before a single spoil <br />row is created. Therefore, due to the depth of overburden, and configuration and length of the pit, it <br />could take over one year to generate four spoil rows. This typical rycle has been drastically reduced in <br />the later years of mining due to the limited areas and required pit orientations due to steep grades. <br />SCC proposes to utilize the general backfilling and final grading sequence illustrated by Exhibit 19-1 <br />and the reclamation schedule shown on Table 19-1 to achieve the proposed postmining topography <br />shown on Exhibit 20-2, Postmining Topography and Drainages. In summary, the annual projection <br />of areas graded are based upon certain considerations. First, approximately two spoil rows are <br />normally graded simultaneously, once pit development establishes asteady-state configuration, to <br />achieve the desired postmining land configuration and to effectively maintain topographic continuity <br />between grading sequences. The number of spoil ridges associated with irregular box cuts, certain <br />inside or outside curves, short pits, facility areas, and haulage ramps will not exceed four spoil rows. <br />Second, timing of grading for specific spoil areas is based upon excavation rycle times and pit <br />configuration. Rough backfilling and grading will be kept within four spoil ridges and within 180 <br />days, except as discussed in variance areas requested. Cycle times are dependent upon factors such as <br />pit configurations, excavator performance, and customer demand. Third, once grading begins, the <br />TR-61 5 Revised 10/08 <br />
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