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4.3 PERMIT AREA OPERATION PLAN <br />4.3.1 OPERATION PLAN -- MINE <br />4.3.1.1 Production Methods and Equipment <br />• Mine Portal Number 1 serves the "A" coal seam. Room and pillar mining was <br />used to prepare the mine for longwall operation. Longwall production started <br />August 4, 1981, using the following equipment and manufacturer. <br />Shields - Hemscheidt Troika System <br />Face Conveyor - Dowty <br />Stage Loader - Dowty <br />Shearer - Anderson Mavor. <br />The longwall is located at the south end of Stoney Ridge and is retreating <br />northward at a rate of 61 feet per week. The pitch of the longwall is 260 <br />westerly and has a face length of 330 feet. Peak production is 2800 tons <br />per day. The life of the longwall operation is expected to be 20 years. <br />The current production method in Mine Portal Number 3, which is working the <br />Sunshine or Anderson seam, incorporates eight continuous mining machines. <br />• Longwall operation will be used in Mine Number 3, possibly in late 1984, if <br />the first longwall proves profitable. These two methods of mining (longwall <br />and continuous miners) will achieve the maximum economic recovery of the coal <br />reserve based on state of the art technology. <br />4.3.1.2 Operation Description <br />A majority of the surface disturbances associated with the underground work- <br />ings of the North Thompson Creek Mine are depicted on the Base Maps, Drawings <br />Numbers D-3-4, D-3-5 and D-3-10, and described in Section 4.3.1.3, "Mine <br />Facilities". The remaining surface disturbances are discussed in detail in $, <br />Sections 4.3.1.4 (Ponds, Impoundments, and Diversions), 4.3.1.6 (Coal Handling <br />Structures), and 4.3.1.7 (Coal and Non -Coal Processing Waste). <br />T <br />4-2 <br />APR 19 IM <br />