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Cont.- Land Recla• ion Board • Page 9 <br />Application for Permit to Operate Open Mining <br />9. List and identify by number and land area any State Permits, <br />which are presently held or have been held in the past by <br />Applicant or any person or legal entity affiliated or <br />associated with Applicant: <br />None - However, on April 20, 1972 a letter was submitted <br />to the Colorado Bureau of Mines, providing the information <br />requested in Section 4 of the Guidelines for Implementation <br />of the Surface Lands Stabilization Provisions of the <br />Colorado Mining Law on Page 137 of Bulletin No. 20, dated <br />January 1, 1971, for essentially the same propertycovered <br />by this application. Also provided to the Commissioner <br />Of Mines was a Performance Bond in the amount of 550,000.00, <br />which pertained to the operation outlined in the above <br />mentioned letter. <br />10. Give a detailed description of the method of operation to <br />be employed in the Open Mining: <br />The basic method of operation to be employed in the Open <br />Mining will be quarrying. Extraction of the crystalline <br />rock wi31 be accomplished by normal quarry mining procedures, <br />including drilling, blasting, power-shovel loading, and <br />truck transportation, in compliance with applicable mining <br />regulations. Overburden, which may be considered suitable <br />for future use as top soil, will be stockpiled. The <br />crystalline rock formation is irregularly fractured, but <br />for the most part drilling and blasting will be required <br />for extraction. Drilling will be performed with air-trac <br />drilling equipment, generally producing 3 inch diameter <br />holes, approximately 20 feet deep, on 8 feet by 10 feet <br />drilling pattern. Ammonium Nitrate and Diesel Pellets <br />will generally be used as the blasting material, which <br />will be detonated with Extra 60~ 2X8 S RS detonatcrs and <br />number 2,4,and 6 (50, 100, and I50 millisecond) fuses. <br />Most of the loading will be done with track mounted power- <br />shovels, and end dump trucks will be used for transporting <br />the extracted material to the processing facilities. The <br />processing plant will consist of a serfes of crushers <br />and dry screening facilities. <br />Reduction of the natural surface elevations will be made <br />by the removal of the crystalline rock in approximately <br />20 foot layers to the desired elevations. All of the <br />highwalls will be limited to maximum slopes of 80 degrees, <br />with 20 foot wide minimum benches at least every _`0 feet <br />in elevation. Each bench will have a slight slope• from <br />the edge of the bench to the highwall to help control <br />water erosion over the edge of the bench. The vs.rious <br />elevations of the benches will be staggered to rec'uce the <br />the appearance of continuous horizontal Iines in the <br />highwall. Exposed rock surfaces in the highwall aze stable <br />and there is no evidence of any need for special precautions <br />to provide for errosion control of water runoff os• air <br />slacking, other than the above mentioned benches. <br />Provisions have been and will be made to assure t}ie flow <br />of surface water in it's established channel by tt~e <br />installation of "French Drains and/or perforated pipe. <br />