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<br />n <br />u <br />MINING AND RECLAMATION PLAN <br />MT. GUNNISON N0. 1 MINE <br /> <br />February 1981 <br />Revised March 1984 <br />JUSTIFICATION FOR RECLAMATION COSTS <br />A. Ripping - A Caterpillar D9 Bulldozer could be used for the ripping. Other <br />makes of bulldozers could be used for this ripping activity. The <br />Caterpillar D9 Bulldozer should not be construed as the only make and <br />model that can do the job. <br />Topsoiling From Stockpile - A Caterpillar 639D Wheel Scraper could be used <br />for the replacement of the topsoil. Other makes of scrapers could be used <br />for the transportation of the topsoil. The Caterpillar 639D Scraper <br />should not be construed as the only make and model that can do the jab. <br />The bulldozer 70% availability factor is used to account for operation <br />delay, minor repairs, altitude correction, and other somewhat intangible <br />factors that are not always quantifiable. The land at the Mt. Gunnison <br />si should be fairly easy to rip. <br />B. A 65 availability/efficiency factor should be used to Berate the <br />erfor ance of the scraper. The factor is used to account for operator <br />lay minor repairs, altitude correction, and other somewhat intangible <br />fac ors that are not always quantifiable. <br />C. An hourly labor rate of E20.50/hour was used. This rate includes straight <br />wages, fringe benefits, workman's compensation, etc. <br />D. The attached chart shows how the cost was calculated for the hourly cost <br />of the machines. These calculated costs are in fairly good agreement with <br />estimates given ARCO by various contractors. <br />E. Fuel costs were based upon b1.10/gallon and fuel consumption rates as per <br />the Caterpillar Handbook. <br />Detail of Mobile Equipment Costs <br />RIPPING <br />Area must be ripped to a depth of one foot. <br />Volume to be rioped (yd.3) (per acre): <br />1 Foot X 43,560 ft•2 Yd~3 = 1 613 <br />acre 27 acre <br />4-34d <br />