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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 im lemented for lateral e <br />p xtensions 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 necessa <br />ry <br />for access to facilities and for safety of personnel. <br />18 <br />Revised 6/92 <br />