2003-05-06_REVISION - M1987131 (2)

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~LAFARG E / NORTH AMERICA Construction Materials May 5, 2003 RECEIVED MAY 0 6 2003 ~ Uiuision •f Minerals and Geology Division of Minerals and Geology Department of Natural Resources 1313 Sherman Street, Rm 215 Denver, CO 80203 Re: Penrose Pit, M-1987-131, Technical Revision Request Deaz Sir. Summary: ~- ~ / Lafazge West Inc. (Lafazge) has operated the Penrose Pit (also known as the Airport Pit) following a sublease agreement executed between Lafarge and Monks Concrete Company, L.L.C. (Monks) in August 1997. The Penrose Pit was actively mined by Monks from 1987 to 1997, whereupon the majority of the mined acres were affected. Lafarge began mining operations in 1997 and terminated activities in 2000. Lafazge's mining activities have been conducted exclusively in Mine Phase III of the 1996 Airport Pit MLRB permit amendment. Lafarge would like to continue its practice of concurrent reclamation following mining activities, however, due to the change in geologic conditions encountered; Lafarge is requesting a technical revision for Mine Phase III prior to the start of reclamation activities. During Lafarge's time of mining, Lafarge disturbed approximately 35 acres within Mine Phase III. A Site Vicinity map is included as Exhibit A. The proposed reclamation contours overlain on the previous Reclamation Plan Map form the 1996 permit amendment, Exhibit F, is provided as Exhibit B. Change in Conditions: Lafarge and Monks agreed that Lafarge should be required to reclaim azeas where Lafarge conducted the mining operations. However, due to the early tennination of mining activities and geologic conditions encountered, the final grade and contours described in the 1996 MLRB permit amendment cannot be Followed. Western U.S, Region 1400 W. 64th Ave., P.O. BOX 21588, Denver, Colorado 80221-0586 Office: (303) 657-4000 Weh: wv~rvv.lafargenorthameri<a.com