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• 4.6.1.5 Subsidence <br />This section presents information on the subsidence that may occur as a <br />result of the underground mining of coal at Snowmass Coal Company's <br />North Thompson Creek Mines. This information is submitted to satisfy <br />the regulations of the State of Colorado Department of Natural Resourc- <br />es~ Mined Land Reclamation Division. <br />This section first presents an inventory of structures and renewable re- <br />source lands in the permit and ad,)acent area. A determination of possi- <br />ble material damage or diminution of use 1s then presented. Finally a <br />subsidence control plan and a limited subsidence monitoring program are <br />proposed. <br />n <br />Throughout this section the unique aspects of the rock mass response re- <br />sulting from mining a pitching (dipping) coal seam are stressed. In the <br />permit and adjacent area the dips of the coal seams and the interburden <br />and overburden rock strata vary from 20' to 35'. Because of the unique <br />geometry of the coal seams the North Thompson Creek Mines were selected <br />by the U.S. Department of Energy (DOE) as the location of a demonstra- <br />tion study to test the feasibility of longwall mining a pitching seam 1n <br />the western United States. A significant factor 1n the demonstration <br />study is a research project to determine the response of the surface and <br />the subsurface rock mass to longwall mining in the pitching seam envi- <br />ronment. <br />• 2 , <br />