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2024-05-21_PERMIT FILE - C1981010A (8)
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2024-05-21_PERMIT FILE - C1981010A (8)
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Last modified
6/6/2025 11:39:32 AM
Creation date
6/21/2024 8:51:20 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981010A
IBM Index Class Name
Permit File
Doc Date
5/21/2024
Doc Name
pgs 3-1 to 3-101
Section_Exhibit Name
3.0 Project Plan
Media Type
D
Archive
Yes
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3.5.3 Post Mining Contours <br />The projected postmining topography of Trapper Mine is shown on Map M12, Postmining Topography. This <br />map depicts the expected configuration of the permit area at the end of 2027. The postmining topography <br />map was developed using actual topography from aerial surveys in 2017 and December 2021 topography <br />from drone surveys, along with engineering estimates of material movement from 2023 through 2027. Map <br />M-14A includes a series of cross-sections that provide a comparison of pre and post mining topography in <br />the active mining area for the current permit term (2023-2027). <br /> <br />Postmining topography cannot be predicted exactly, however, the best estimate given today's technology <br />is presented. Map M12 is, therefore, an approximation of the re-contouring limits with a representation of <br />the shape of the topography that will most likely be produced. However, by March 15th each year of the <br />permit term, Trapper will submit to the Division a map showing actual postmining topography for the <br />previous year. Appendix W will contain each year map. <br /> <br />As production fluctuates to reflect changes in economic and natural conditions, the areas requiring <br />regrading may change to a limited extent. Lengthening or shortening of various cuts may occur as they are <br />more precisely designed, and thus cause some deviation from the map as presented. Cut lengths may be <br />affected as a result of better or worse economic conditions which affect the economic stripping limit, or as <br />a result of differences between inferred coal oxidation limits from existing drill data versus the actual limits <br />encountered when mined. <br /> <br />If changes in cut lengths occur, the locations of the pits as of December 2022 may also be affected as the <br />progression of the pits is a function of their lengths. The pit locations may also be affected by several other <br />factors such as changes in the characteristics of the overburden and interburden which in turn affect digging <br />rates or by changes in scheduled digging times resulting from labor or equipment problems. These <br />influences could cause an increase or decrease in the areas requiring regrading as compared to those <br />shown on Map M12. Regrading areas depicted on Map M12, Postmining Topography, and Map M10 series, <br />represent regrading under maximum production. <br /> <br />As explained in section 3.1.4.1, a permanent fill resulting from K pit truck/loader operations was constructed <br />in the Horse Gulch drainage area. This fill resulted in a raised topography in the affected area. The fill <br />location is shown on Map M10A. The postmining configuration is shown on Map M12. Final geotechnical <br />designs for the Horse Gulch fill are included in Appendix T. A description of the fill is explained below. <br /> <br />Horse Gulch Fill <br />Mining of K Pit with a truck and loader fleet required the use of a head of hollow fill capable of storing <br />approximately 24.6mm BCY of excess spoil. The fill was necessary to ensure the safety of men and <br />equipment during mining operations. Spoil placed upslope of the active T/L fleet could have potential to <br />fail, moving downslope onto the T/L or coal loading operations. <br /> <br /> <br /> <br />3-40 <br />
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