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INFORMATION ABOUT THE VIOLATION RULE 5.04.3(1) NOTICE OF VIOLATION NO. C-93-45 SUBMITTED BY: ENERGY FUELS MINING CO. on APRIL 30, 1993 PERMIT C-82-055 I. FACTS SURROUNDING THE VIOLATION: Eoergy Fuels does not believe that the subject highwall failure is a significant hazard to the public property, or a health and safety concern to the operation under permanent cessation. The effects to the environment are limited to an area measuring 70 feet long by approximately 17 feet thick (rock slab). The subject azea initially slabbed off a maximum of 12 feet thick during August, 1991 (approx. 235 cu. yd. of material). Another 5 ft. Utick slab of the highwall sandstone has slowly slumped since September 1992, behind the original rockfall. Energy Fuels has monitored these conditions from their onset. The OMLR has inpsected the site during the above dme period and has not documented any relevant concerns. The subject rockfall ("highwall side") is limited to the 13 feet thick bench of sandstone overlying the Upper Starkville seam, which is approximately 6 feet above the Raton Creek Mine portals in the Lower Starkville seam. The length of the rockfall (70 feet) is contained io the area between two abandoned mine portals of the Starkville mine (Colorado Fuel and Iron Corp.) developed between 1884 and 1921. The rockfall (and adjacent rock slump) on the highwall are a direct result of subsidence as the abandoned Starkville Mine portals gradually collapse. These aze not conditions that Energy Fuels can control as long as the highwall remains exposed. Energy Fuels has been concerned about stability of subject highwall area primarily from the stand point of achieving stable reclamation after backfilling the portal azea. We intend to take whatever steps possible, within economic and safety limitations, to minimize additional subsidence of the abandoned portals during backfilling of the Animas Portal area.