Laserfiche WebLink
5/23/75 <br />.y <br />COOLEY GRAVEL COMPANY ~ „~, ,~ j <br />,1 t1 L 2 ~. ~ 975 <br /> <br />This is to describe the quarry operation located approximately <br />1.5 miles south of Morrison on Colo. Hwy. 8 and all within the <br />attached property descriptions. The described property contains <br />166.99 acres, of which approximately 80.28 acres are directly <br />affected. Quarry excavation 57.4 acres, plant and stockpile 15.9 <br />acres, access roads 5.28 acres and office and scale site 1.70 acres. <br />The methods employed by the Cooley Gravel Company in the operation <br />of the Morrison Quarry are stripping, drilling, blasting, loading, <br />hauling, r_rushing and screening, Each method is explained herewith <br />as they apply end in their respective sequential order. <br />Stripping is accomplished by bulldozer/ripper, scrapers, <br />loaders and trucks. The purpose being mainly to rid the surface <br />material of vegetation. Stripping is used for development of <br />access within the quarry and will afterwards be used in reclamation. <br />Drilling is by air tracks powered by portable air compressors. <br />Wet drilling is employed to minimize dust. A 3" diameter hole <br />with a maximum depth of 40' is being used. An 8' x 8' staggered <br />;idrill hole pattern has been successful. Explosives used are <br />;~; ~dynemite and ammonium nitrate (anfo}. Detonators are blasting cap=. <br />to prima cord to primers to anfo. Drill patterns are designed not <br />5 to exceed blasts of 10,450 lbs. total explosives using at least a <br />\1 half dozen delays, Refer to the report dated March 20, 1975 on <br />the analysis of blasting and submitted herewith as a part of this <br />application. The report was prepared by Kenneth W. Carlson, a <br />grFduate student of the Geophysics Department of the Colorado <br />School of Mines. Carlson's education and professional experience <br />is listed on the last page of the report. The report by Carlson <br />is supported by certain data compiled by Cooley and the School of <br />Mines over the previous years the quarry has operated. <br />The quarry will be excavated to leave a series of benches with <br />$0' vertical heights sloping at less than 80 degrees from horizontal <br />with horizontal level widths of 40'. Refer to CSMRI Project <br />No. C41006 which is the Morrison Quarry Layout of December 1974 and <br />an accompanying letter of explanation from James M. Link., Mining <br />Division Director. These documents have been submitted as a part <br />of this application. <br />The material to be processed is loaded into off-hil;hway trucks <br />with a front end loader and transported therewith to the processing <br />plant. The processing plant is basically a series of crushers, <br />screens and conveyors so arranged that the material can be sized <br />