2023-08-07_REVISION - C1982056 - Laserfiche WebLink

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The 13-Left Outby Utility Borehole, approved in 2015, to transfer concrete from the surface to the end of 12 and 13-Left longwall panels, constructed a borehole pad upgraded an existing two- track ranch road. The access road and pad are located in the north east quarter of Section 20 of Township 5 North Range 86 West. The 9-East Utility Borehole, approved in 2016 included two boreholes. One borehole as a monitoring and control borehole, which allows air to be drawn from the sealed mine areas by an exhauster unit. The second borehole used as a grout or utility pipe and a power drop or communication cable drop. In 2017, two additional utility boreholes, including one additional pad were added to this disturbance. Thickener underflow borehole location SWMD- 1 is located on the west side of Routt County Road (RCR) 27 between the west entrance and the Fish Creek Borehole road. The lands affected by the proposed revision are located in Sections 25 and 36 of TSN, R87W and Sections 31 and 32 of TSN, R86W. The associated pipeline extends to the south and east between the borehole and the junction to the 1-MN Thickener Underflow Pipeline leading from the wash plant facility. SWMD 1-SW and WMD 12-Left Thickener Underflow Boreholes, Pump Boost Station, and Pipelines were approved in 2017, above Southwest Mining District(SWMD) -Panel 1 SW, and in the Western Mining District(WMD) -Panel 12-Left. The new installations were installed as a backup for and to replace SWMD boreholes 2SW and 3SW. 14-Left, 15 Left, 16 Left, and 17-Left thickener underflow (TUF)boreholes, drill pads, and additional pipeline were approved in 2018, in the Western Mining District above their associated panels. 18LT Dewatering Borehole, pipeline, and powerline were installed to dewater the western mining district. An additional bulk-material borehole on the 6MN north pad (BMBH#2)was installed. This borehole replaced the previous worn out unusable borehole. This second borehole will also be used as the nitrogen injection borehole. This did not create addition disturbance as the pad was pre-existing. The borehole is 13" diameter and approximately 1,340 feet deep. Physiographic Setting The permit area varies in elevation from 6,600' to 7,500' with the portal openings at 6,885' along Foidel Creek. Generally, the topography consists of gently rolling hills, dip slopes and cliff outcrops. Flatter topography is evident in the valleys of the major streams draining the area (Fish Creek and Foidel Creek), as well as along the gentle dip slopes. Prominent cliffs have formed where massive sandstone units outcrop. Geologic Setting The rock units of Twentymile Park Basin which dip 5° - 30' toward the central portion of the basin are of local significance. Normal faulting has been identified throughout the permit area, striking generally northwest to southeast, with displacement of zero to 85 feet. A reverse fault Foidel Creek Mine 8 August 4,2023