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<br />Ms. Maggie Koperski <br />July 30, 1977 <br />Page 2 <br />After your visit to the site, I am sure you will agree that topsoil is <br />practically nonexistent on this rock mountain. If any is found, it <br />will be stockpiled on the southern most portion of the site. After the <br />loose surface rock is removed, it is anticipated that solid basalt rock <br />will be found which will necessitate drilling and blasting. Quillen <br />proposes to have this done by one of the commercial firms in the area. <br />With a production of something less than 70,000 tons per year, blasting <br />should be infrequent (2 to 4 times per year). The final configuration <br />will be achieved by controlled drilling and blasting and should leave <br />the solid rock configuration proposed. As mentioned earlier, the loose <br />surface rock will be removed by front end loader and dozers. After this <br />is completed, the face will be blasted to open it up. Blasting and <br />excavation will proceed in the manner specified in the timetable of <br />operations. There will be no storage of blasting materials on the site <br />since all drilling and blasting will be carried out by commercial opera- <br />tors:in the area. <br />Crushing and stockpiling will occur on the site at the southern end. <br />Enclosed are copdes of the "Fugitive Dust Emissions Permit Applications" <br />for both the crusher and the Fedinec Pit. Quillen Company has copies of <br />and is familiar with the "Relocation Information Sheet for Portable Rock <br />Crusher" required by the Air Quality Control Division. A relocation <br />sheet will be submitted whenever the crusher is moved. <br />Although the USGS Breeze Mountain Quad contours indicate a rather gently <br />sloping terrain, I am sure that you will remember from your visit to the <br />site that this is not the case. The existing face more nearly approaches <br />the vertical (75 to 80 degrees estimated). Assuming the deposit is as <br />solid as anticipated, the 40 foot highwall will approximate the present <br />contour except for the bench which will be left halfway up the face as <br />required by the Colorado Bureau of Mines Mining Laws. <br />As per your suggestion, the bench will be given a slight slope so as to <br />allow drainage off to the side as opposed to over the face. This can be <br />accomplished by replacement of material on the bench to create the slightest <br />slope. <br />The 80 degree final slope proposed is consistent with existing contours and <br />Colorado Mining Law. To elaborate further on the Quillen Company's <br />proposal, 80 degrees would be the maximum slope if the deposit is as solid <br />as anticipated. However, if during lasting and excavation it is deter- <br />mined that the deposit is not solid, final slope would be at the plane of <br />weakness which could be something less than BO degrees as per Colorado <br />Mining Laws, Bulletin 20, 116.6 "When the face is composed of moderately <br />compounded materials that are not firmly cemented or consolidated but which <br />experience indicates will stand in place (existing conditions at Fedinec), <br />the slope shall not exceed sixty-five (65) degrees from horizontal where the <br />height is greater than can be reached by the dipper or bucket of the loader <br />or excavator Beino used." <br />