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• BALAZ ~ ASSOCIATES, INC. • iiiiiiiiiiiiiiiiiii 999 R ~flm 1005 N. 12th St., #211 Grand Junction, CO 81501 Phone: (970) 263-97:;3 December 20, 2000 Mr. Gregg Squire Division of Minerals and Geology 1313 Sherman Street, Room 21 S Denver, CO 80203 Re: Mamm Creek Gravel Pit Roaring Fork Resources, Inc. File No. M-2000-113 Dear Gregg: Please find enclosed the following response to Mr. Allen Sorenson's review comment letter dated November l6, 2000. Item 1 -Method to control the depth of mining in the Renewable Resource Area. The operator intends to utilize a series of cross sections extending from the upstream barrier to the downstream barrier. The cross sections are of sufficient length that each end is located in land that will not be disturbed by mining. Coordinates are provided for each end of the cross sections to allow surveyors to locate the ends in the field. The coordinates are based on the horizontal control established for the topographic mapping that was done in 1999. The operator will establish these cross section lines prior to mining in the Renewable Resource Area. The existing ground has been plotted for each of these cross section locations using the 1999 topographic mining. The mining depth has been established by taking a straight grade tangent between surface points on the lower and upper ends of a longitudinal cross section down through the Renewable Resource Area. This tangent line is lowered five feet in elevation to establish the mining elevations for each of the control cross sections that cross the renewable resource area. The mining elevation is extended to the edge of the banks where 3:l slopes will be left. The location of and the cross sections are shown on the attached Exhibits C-3, C-4, CS-1 and CS-2. This cross section information will be used to develop reclamation plan for the Renewable Resource Area if the Colorado River does not capture the area. After the initial mining in the Renewable Resource Area, the operator will survey each of the cross sections in the active mining area to verify that the design mining depth is being maintained during low flow periods. This cross section survey information will be provided in the annual report.