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development will add approximately 2,430 acres; and Interim Phase III development will add approximately 20
<br />acres to the affected area. Areas to be developed in the WMD during the current and subsequent permit terms are
<br />shown on Map 23 Mine Plan. Alignment of development entries may be adjusted, as necessary, to address geologic
<br />conditions. The preliminary development layout will include main and sub -main development work as described in
<br />the referenced Permit Revisions. The dimension of pillars in these development areas may vary based upon mining
<br />conditions. Sumps and ventilation doglegs will be added as needed. Locations for these minor operational features
<br />are not provided on Map 23, due to the need for some flexibility in the placement of these features.
<br />During the Phase I, Il, and Interim III WMD development, preliminary development work will be conducted under
<br />the Fish Creek AVF, Fish Creek, several powerlines, and several stock ponds. A more detailed discussion of
<br />undermining these structures is presented under the subsidence discussion. Because the preliminary development
<br />work (WMD, Panels 13- through 17 -Left)) will be limited to main and sub -main entry development with retention
<br />of support pillars, no subsidence will be associated with these activities.
<br />WOLF CREEK RESERVE (WCR)
<br />WCR Development and Mining (Rock -Slope Access, Development and Mining of Panels WC-4RT through
<br />9RT, TR13-83, PR15-11)
<br />Development and mining of the WCR will result in limited change in surface disturbance and affected areas, since
<br />development and mining activities will occur primarily within the boundaries of areas previously affected by
<br />development and mining in the EMD and NMD. Planned mining in the WCR will result in an incremental affected
<br />area of approximately 114 acres where Panels WC-4RT through 6RT extend beyond the previous mining limits on
<br />the eastern side of the WCR. Areas to be developed in the WCR during the current permit term are shown on Map
<br />23 WC, Wolf Creek Mine Plan. Alignment of development entries may be adjusted, as necessary, to address
<br />geologic conditions. The preliminary development layout will include the rock -slope access and main and sub -
<br />main development work as described in the referenced Permit Revision. The dimension of pillars in these
<br />development areas may vary based upon mining conditions. Sumps and ventilation doglegs will be added as
<br />needed. Locations for these minor operational features are not provided on Map 23WC, due to the Beed for some
<br />flexibility in the placement of these features.
<br />Development and mining in the WCR will be conducted under portions of the Fish Creek AVF, Fish Creek, the
<br />Union Pacific Energy railroad spur, County Road 33, Foidel Creek, several powerlines, and several stock ponds. A
<br />more detailed discussion of undermining these structures is presented under the subsidence discussion.
<br />Underground Drillholes (MR01-172 — Withdrawn 07/11/01)
<br />2011-2012 WMD Exploration Program (MR11-256)
<br />TC proposes to construct drill -pads, and drill and log up to 7 exploration drillholes in the active WMD, in order to
<br />better delineate coal seam thickness and characteristics, and to more accurately define structural conditions,
<br />including faulting. The proposed drillhole locations as shown on Figure EX52-Fn
<br />1, 2011-2012 WMD Exploratio
<br />Program. and Map 24, are on lands where TC is the surface owner, and the coal is under either fee (drillholes
<br />TCW001. 002, 004, 005, 006, and 007), or Federal (drillhole TCW003) ownership. The proposed drill -sites have
<br />been evaluated for both potential cultural resource and wildlife impacts, as documented by the cultural resource
<br />survey report included in Exhibit 6L and the wildlife consultation letter provided in Exhibit 23C.
<br />Dilll-sites have beet, selected and located to facilitate access llunl existing County and ranch roads. Where direct
<br />irvtii e.\J,tmjg- luaJs i,, tiut leasibie, dinwig equlpnleiii dntl suppiies will tiavei uveiialnO sllult U1Stdllles
<br />during periods when ground conditions are favorable, to access the drill sites. Drill pads will be approximately 75 x
<br />75 feet (0.15 acres), with soil material stripping limited to an area around the drillhole collar, and the area
<br />surrouiidi;igy ani- containment pits necessary to support drilling operations, in order to minimize disturbance and
<br />facilitate site reclamation. If required, any containment pits will be excavated to provide sufficient capacity for full
<br />PRI 5- 1. 1 2.05-17.1 07/06/15
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