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<br />The purpose of this Minor Revision is to change the <br />location of the new Allen Mine air shaft in the left fork of <br />Apache Canyon from the location shown on the final Permit <br />Application (Volume 3, Map 3A, Mine Plan Map) listed as the <br />tentative shaft site, to a location approximately 250 feet to <br />the southwest. Construction of this new shaft has been <br />addressed in Final Permit Application No. C-012-81 and Mined <br />Land Reclamation has been aware that CF&I intends to construct <br />this shaft for over one year. Representatives of Mined Land <br />Reclamation visited the Apache Canyon site during a field trip <br />in the fall of 1981. <br />CFI intends to commence construction in early May of 1982 <br />and anticipates that the project will be completed by October <br />1982. All construction will take place within the permit area <br />and no new roads will be needed. Access to the site will be by <br />the existing Apache Canyon road system. <br />The air shaft will be constructed by the raise boring <br />method. Construction by this method will be accomplished by <br />drilling a pilot hole down and reaming the shaft up. Shaft <br />• cuttings (about 2,100 Yd3) will fall to the mine workings and <br />will be transported underground to the surface facilities area <br />of the mine. The cuttings will be handled as mine refuse and <br />will be disposed of in the existing mine refuse disposal bank. <br />Initial construction will begin by constructing an <br />undisturbed-water diversion ditch above the shaft site as shown <br />on Map A. The area to be disturbed (less than one acre) will <br />have the topsoil (10 to 12 inches) removed and stockpiled in <br />the immediate area. The stockpile will be seeded in accordance <br />with the applicable sections of Application No. C-012-81. <br />After the topsoil is removed, the shaft collar will be <br />constructed down to suitable bedrock which is estimated to be <br />10-15 feet below the surface. This material (subsoil and <br />shale) will be spread evenly over the disturbed area and will <br />be later covered with gravel. After the shaft collar is <br />finished the raise boring machine will be placed over the shaft <br />collar and a 13-inch diameter pilot hole will be drilled to the <br />underground workings which lie approximately u25 feet below the <br />surface. The reamer bit will be assembled in the mine and <br />connected to the boring machine drill steel. The 13'3" <br />diameter shaft will then be bored to the surface with cuttings <br />being handled as previously described. <br /> At this point, the raise boring machine will be removed <br /> and the shaft will be concrete lined to a finished diameter of <br /> 12 feet. <br />~ -OZ <br />~~~9g <br />