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• 4.6.1.5.3 Subsidence Control Plan <br />This subsidence control plan is presented for Snowmass Coal Company's <br />North Thompson Creek Mines. This subsidence control plan has been de- <br />veloped to prevent possible damage to or diminution of value of struc- <br />tures and renewable resource lands in the permit and adjacent areas <br />while data from an ongoing Department of Energy (DOE) rock mechanics <br />study is collected and analyzed. The subsidence monitoring.poction of <br />the DOE rock mechanics study is described 1n sectioe 4.6.1.5.4 of this <br />permit. <br />The lack of an adequate data base on the subsidence phenomena associated <br />with pitching seam mining has made it impossible to predict subsidence <br />effects at the North Thompson Creek Mines to a degree compatible with <br />maximum resource recovery. As a consequence. Snowmass Coal Company pro- <br />poses to control subsidence by limiting full extraction mining and the <br />resulting subsidence effects to those areas where structures or renew- <br />able resource lands will not be damaged or will not suffer any dlminu- <br />tlon of value. <br />Damage to or diminution of value of structures and renewable resource <br />lands will be prevented by defining mining limit envelopes around these <br />features within which full extraction mining will not be conducted with- <br />out prior approval from the Mined Land Reclamation Board (NLRB). Snow- <br />mass Coal Company does reserve the right to drive widely spaced develop- <br />. ment entries within these mining limit envelopes. The layout and dimensions <br />of existing and planned development entries and slopes within the mining <br />limit envelopes are sham on Figures 4.6.1.5.3-1 and 4.6.1.5.3-2. res- <br />pectively. 24 (Revision JUNE 1982) <br />