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~I I~II~~II~IIIIIII 71ittleApplegate,lnc. Consultants for Land, Mineral and Water Development April 27, 1998 Mr. Gregg Squire Division of Minerals & Geology 1313 Sherman Street, Room 215 Denver, CO 80203 RE: Adequacy Response, Johnson Pit; Permit M-94-007 Deaz Gregg: RECEIVED APR 27 1998 Division of Minerals 8 Geology With this letter we wish to respond to your adequacy review letter of February 12, 1998. In this letter you have six comments and questions. I will offer you our response in the same order. Your interpretation of the grading on Exhibit C and the reclamation plan map is correct. The mining grades and Exhibit F has been revised with a new contour map. You'will note that the average depth of mining of the Phase 1 and 2 mining azeas are [o the 4044 foot elevation. The average depth of the Phase 3 mining area are to the 4041 foot elevation. Enclosed is a new Exhibi[ F. Also, you will note that there is no fill involved with the reclamation plan. Attached with this letter is a longitudinal profile of the reclaimed creek channel. As you can see in this profile, we have maintained the same shallow channel grade as exists now. As you can see in our profile, during minor rainfall events the runoff will simply fill up the pit azea and then soak back to the aquifer of the creek. In major rainfall events the runoff will fill up the pond and then flow out of each pit area. These depressions in the creek channel will decrease the impact during a flood event. 2. The regrading of the reclamation plan has resulted in a downwazd slope of the pit floor to a new defined creek channel in the center. Also enclosed with this letter is a section through the Phase 1 and 2 mining areas. Here you will note that this area is very flat and there is presently a I % gradient towazd the creek channel. Our mining has lowered this situation and maintained the I % slope to a new creek channel. Side slopes are at 3:1. If the pit floor was sloped at a 2% to 4% grade toward the creek channel, it would result in a significant loss of sand material which could be recovered. 11990 Grant Street, Suite 304 • Denver, Colorado 80233 • (303) 452-6611 • Fax (303) 452-2759