Laserfiche WebLink
West Elk Mine <br />• Man-made surface structures exist on the coal lease azea and within the South of Divide pemut <br />revision azea (Exhibit 32B and Map 67). The only known man-made structures which are currently <br />used (intermittent seasonal use) are Monument Dam -Minnesota Reservoir (Exhibit 74) and a cattle <br />camp on the Dry Fork of Minnesota Creek with awood-framed building on a concrete slab completed <br />by the landowner in October 1994 and a smaller wood-framed building and livestock enclosure <br />constructed in November, 1995 (see Exhibit 73). A deteriorated and collapsed cabin exists in Sylvester <br />Gulch, and the remnants of soil and stone foundations of two buildings exist on a small bench <br />overlooking the mine portal. The remains of three log structures, possibly a cabin, barn and shed, aze <br />located in Lone Pine Gulch. Several similaz abandoned structures exist on the Jumbo Mountain lease <br />tract (see Exhibit l0A and Exhibit l OB). Other abandoned structures in the pemut area, aze described <br />in the Cultural Resources Reports in Exltibits 10, 10A, l OB, l OC, l OD, and 10E. Projected subsidence- <br />related impacts to these "structures" are addressed under the permit section entitled "Effects of <br />Subsidence and Mine-Induced Seismic Action on Man-Made Structures and Renewable Resources". <br />Based on field evaluation of the West Flatiron lease area, there are no structures or renewable <br />resource lands within the boundary of COC-67011. Known springs and renewable resource lands in <br />the Raven Gulch drainage aze not within the affected area associated with mining of the West <br />Flatiron lease tract. The only notable man-made structure potentially influenced by mining <br />activities within the least tract is Highway 133. The potential impact to this structure is indirect by <br />reactivation of known landslides south of the highway and north of Longwall Panel 18A. Impacts <br />from, and monitoring of, this potential reactivation are addressed under the worst possible <br />consequences discussion associated with mine-induced subsidence under (Landslides) below. <br />Monument Dam and Minnesota Reservoir -Though the coal underlying the reservoir and dam is not <br />leased by MCC and is not planned to be mined, mining-related phenomena could have an impact on <br />the dam structure and reservoir in it's current configuration 3-15-2006, at a factor of safety of neazly <br />1.0. The dam and reservoir lie outside the anticipated angle-of--draw of mining- induced subsidence <br />(see Map 51 for the depicted angle of draw at 25 degrees). However, to make certain the maximum <br />extent of subsidence will not impact the reservoir or dam, MCC plans to confirm the angle-of--draw in <br />the SOD azea while raining occurs in panels well away from the structures. A description of the plan <br />to confirm the angle-of--draw is outlined in Section 2.05.6 (6)(e)(i)(D) -Detailed Description of <br />Predicted Subsidence Phenomena, Subsection "Effects Of Subsidence And Mine-Induced Seismic <br />Activity On Man-Made Structures And Renewable Resources", Monument Dam -Minnesota <br />Reservoir, item 1. <br />MCC also proposes to initiate a significant survey program with horizontal and vertical control <br />elements of the Minnesota Reservoir, Monument Dam, and the landslide located in the left abutment of <br />the dam. This program is also described in Section 2.05.6 (6)(e)(i)(D) -Detailed Descripfion of <br />Predicted Subsidence Phenomena, Subsection "Effects Of Subsidence And Mine-Induced Seismic <br />Activity On Man-Made Structures And Renewable Resources", Monument Dam -Minnesota <br />Reservoir. The purpose of the survey is to determine if there is any movement of the dam, reservoir <br />basin ground surface, and landslide while mining is taking place in the SOD azea. <br /> <br />2.05-108 RevrsedJurte 1005 PR10, Rev March 1006; Rev. Aprrt 1006 PRIG; May 1006PRI0 <br />