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~~ <br />t~ <br /> <br />• • III IIIIIIIIIIIIIIII <br />999 <br />United States Department of the Interior <br />GI((lLI1GICA1. til1K~'F1' <br />Box°5u46 stop 602 c-03330] <br />_ llcnvcr Fcdl•ral Ccm rr <br />Ilc uv cr, Colorado RO'1or, <br />t <br />June 13, 1979 <br />Plemorandum <br />To: Regional Director, Office of Surface Mining, Denver, CO <br />Attn: John Hardaway <br />From: Acting Area Mining Supervisor, CRMA <br />Subject: Mining plan, Blue Ribbon Mine, coal lease C-033301, <br />Sunflower Energy Corporation (sublessee) <br />This office has reviewed the mining and reclamation plan dated <br />May 21, 1979, for the underground Blue Ribbon mine as to the <br />development, production and resource recovery and protection. <br />To make the plan of mining operations satisfactory, the following <br />information is needed: <br />Narrative Section - Minine Plan <br />Discuss development of the main entries giving number of <br />entries, entry widths and centerline distances. <br />Discuss development of panel entries off the main entries, <br />giving sequence of development and mining of the panels. <br />Discuss typical plan for mining coal within the panels. <br />Will rooms be mined on both sides of panel entries or one side <br />only? Will rooms be mined by advance or retreat mining methods? <br />Give rationale for 60-foot wide panel barrier pillars <br />(40- to 50-foot width Ss usually adequate). <br />Give average planned rate of production, daily and anmlally. <br />Mine Layout Map <br />IN kF.l'LY Il l: Flak TU <br />The mine plan map should show all the measurements for <br />development of the main entries, panel entries, rooms and barrier <br />pillars. The map should show sequence of developing panel entries, <br />sequence of mining panels and a typical plan for room and pillar <br />mining of a panel. The plan should designate areas to be mined <br />annually for at least [he first 5 years of operations. <br /> <br />