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2-14 <br />MINING METHOD <br />i <br />Five to seven mainline entries will be developed as shown to access the three major <br />reserve blocks east of the graben. Submains, typically consisting of five entries will then be <br />driven to access the areas where production panels will be developed. As areas of the <br />reserves are extracted, the submains and mains will be sealed as necessary to minimize the <br />amount of ventilation that is required for inactive areas of the mine. <br />Dependent on mining conditions, the mainline entry and crosscut spacing as well as those <br />for the submains will vary from 75 feet to 200 feet. Entry width will be from;16 feet to 20 feet. <br />A typical cross section for the five entry system is shown in Figure 2.1-2. <br />I <br />The production panels will be approximately 600 feet wide. Widths may vary to allow for <br />more efficient extraction of the irregularly shaped reserve blocks. The length of the production <br />panels will also vary to fit the outline of the area to be mined. Production panels will be mined <br />using room and pillar mining techniques. Entries will be advanced to the end of the panel then <br />the pillars will be mined on the way out of the panel. No speck pillar retrieval method has <br />i <br />been designed and adopted. The design will be undertaken as each panel is developed. As a <br />rule, second mining will occur in the upper portion of the seam. Bottom mining will only be <br />used with site specific approval from the BLM. When a standard pillaring plan is adopted for the <br />I <br />entire mine, an amendment to this mine plan will be submitted to the DMG and BLM. Barrier <br />pillars 200 feet wide will be left to protect the main entries. <br />MC Volume 1 14-29-96 <br />