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Chapter II <br /> • Coal Basin is in an avalanche-prone area. Heavy snows, steep gullies and cliffed <br /> slopes encourage the development of unstable snow. <br /> • The roads were mostly constructed in cuts using the sidecast method. Fills were <br /> mostly used as a means of disposing of material from the cut. <br /> (2) Present Usage. <br /> The Adit/Rock tunnel, which is the primary transportation corridor of the mine, has been <br /> operational since 1987. It extends to the underground workings of Mines #1 and #2. <br /> Coal is transported from underground mine to surface storage on a conveyor belt which <br /> extends through one bore of the twin-bore tunnel. Transport of personnel and <br /> materials is through the other bore. <br /> Ventilation and roof support facilities critical to the underground operations are <br /> situated at the Mines #1 and #2 portal benches, and the entries from these portals are <br /> escapeways. Deliveries of rock dust and aggregate material are made regularly to <br /> facilities at this portal. The road is kept open during the winter months. The road <br /> segments leading to these portals are designated Access Road to reflect current <br /> usage. <br /> Plans have been made but not implemented for lateral extensions of the tunnel to the <br /> workings of Mines #3, #4 and #5. Access to and from these mines is over the road <br /> system developed for coal haulage. These mines have been idle for a period of years, <br /> and winter access over the road system is not maintained. Road segments leading to <br /> these facilities are designated Light Use Road(s). <br /> Anticipated future use of the portals while the mine is operational include continued use <br /> of Portal Benches #1 and #2 for underground support facilities, possible mining of <br /> remaining coal reserves from Mine #3, and use of the #5 entry to gain access to <br /> unmined blocks of M-bed coal. Plans to de-gas the coal in advance of mining <br /> anticipate use of the road from #4 mine portal over Huntsman Ridge to access the <br /> lands above the coal, and use of#4 portal bench as a staging area for the de-gas <br /> program. <br /> 3) Maintenance <br /> The roads will be maintained as necessary for present use. <br /> Snow Removal. <br /> Snow clearing and avalanche control on roads and benches will be done as necessary <br /> for access to facilities and for safety of personnel. <br /> 18 <br /> Revised 6/92 <br />