Laserfiche WebLink
Exhibit 42A (Cont.) <br />Lone Pine Gulch Ventilation Facilities <br />(Technical Revision No. 97) <br />Project Description <br />Introduction <br />The Lone Pine Gulch Portals were situated approximately one (1) mile west of Somerset, <br />Colorado, at an elevation of approximately 6,480 feet. Access is gained by traveling <br />approximately 1 '/~ miles on an existing giavel light-use road with a locked gate, south of <br />Highway 133. <br />The Lone Pine Fan Facility was constructed. in 1995, accessing the B-Seam, to serve the <br />West Elk Mine as the primary ventilation facility for the the-7i completed Northwest <br />Longwall Panels (Nos.l-7); the Jumbo Mountain Longwall Panels (Nos. 8 and 9), and <br />Southern Longwall Panels (Nos. 12, 13, 13A). These 121ongwall panels have now been <br />isolated underground from the active workings, using explosion resistant seals, and the <br />entire azea is now abandoned. As a result of Technical Revision No. 93, in 2001, <br />bulkheads were installed in the Lone Pine Portals. The surface azea of the Lone Pine <br />Ventilation Facilities were graded to approximate original contour, seeded, fertilized, and <br />mulched in 2002. The substation was removed, graded to approximate original contour, <br />seeded, fertilized, and mulched in 2003. <br />The active workings aze currently ventilated by the Shaft Fan Facility, Shaft No. 3, and <br />the F-Seam Fan Facility in Sylvester Gulch. <br />Considering the risk of spontaneous combustion, the lazge azea that was being ventilated, <br />and a thermal event in January 2000, it is in the best interests of human health and safety <br />for MCC to take the Lone Pine Gulch Fan Facility out of service. This required MCC to <br />dismantle the fan, seal the portals, install watertight bulkheads, backfill the portals, and <br />permanently reclaim the azea. Currently, MCC has reclaimed the portal facilities and the <br />substation. <br />The bulkheads were constructed using apoly-grout (MICON 550 MPG)/ aggregate <br />mixture and constructed between steel-sets previously constructed in the portals. Rods <br />and bolts were drilled into the surrounding rock surfaces a minimum of four feet and the <br />bulkheads were hitched into the ribs. Concrete block served as forms for the bulkheads. <br />The azea around the perimeter of the bulkheads was ring grouted to form a watertight <br />barrier and at completion should form a formidable barrier capable of withstanding 130 <br />feet of water head pressure. <br />