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cuts in both panels and sub-levels at intervals as required by <br />• regulations. <br />Main entries will be driven at an ascending slope of 7 degrees for <br />fluming and will be S ft high by 14 ft wide. The sub-levels will <br />then be driven off of the panels to the crown pillar on 70 ft <br />centers, (subject to results of initial production operation at the <br />very western area) at 7 degrees ascending and at an operating <br />minimum size of 8 ft high and 10 ft wide (Figures 9.3-2) Main <br />entries will be roof-bolted throughout, sublevels will be bolted as <br />required by MSHA regulations. If needed, certain sections may also <br />be supported by steel arches. <br />The crown pillar will be determined by reaching oxidized coal or <br />100 feet down dip from the outcrop, whichever occurs first. vary- <br />ing depth of oxidation may create an irregular line, but this will <br />not be a factor in the operation. <br />All development openings will be rock dusted and otherwise treated <br />• as in conventional coal mining. <br />9.3.2 Operation ~escriotion <br />All production mining will take place from the sub-levels with tt~e <br />monitors mining vertically up dip from a low sub-level to the <br />mined-out sub-level above, (Figure 9.3-2) The procedure essen- <br />tially follows present practice in the industry, but company <br />engineers feel the leaving of a ramp pillar would achieve better <br />recovery of coal with less rock dilution. <br />In each operating panel several monitors will be in service, with <br />one operating, one moving, and one or more on stand-by (Figure 4.2- <br />2). The monitors will be mounted on feeder-breakers. Control of <br />the monitor shall be hydraulic, from a control cab located behind <br />. NCIG - Coal Ridge #1 4-15 ABC/1145/910509 <br />Tti-7 <br />