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• <br />].l <br />SUMMARY <br />The strength properties of the coal in the Cameo "B" seam at the Roadside <br />Mine exceed those for any of the western U.S. coal seams for which test results are <br />available. The lateral variation of the strength properties across the 2nd and 3rd East <br />Sections is minimal and composite strength results are recommended for design. <br />"Pillar Slabbing" to 14 by 80 ft is recommended for all pillars within 100 ft of <br />the Ute Water Co. property and within 100 ft of the 24-in. Ute Water Main. Such <br />pillars should have at least a 14% higher factor of safety than the currently stable <br />pillars in Section (Panel) "G" at the Roadside Mine. It is probable that the increase <br />will be at least 31% above the pillars in Section "G." Smaller, 12 x 80-ft, pillars <br />should be sufficient at a depth of 200 ft, but such a small area is under such thin <br />cover in the 3rd East Section That this reduction is probably not warranted. <br />• Subsidence predictions for the unlikely case of pillar failure within the safety <br />area under the Ute Water Co's. surface facilities indicate that backfilling should <br />eventually be done within 100 ft of those facilities. Backfilling in This area of the <br />2nd East and 3rd East Sections would eliminate any potential for long-term subsidence <br />impact on the Ute Water Co's. surface facilities. <br />• <br />