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+~~- ~ ?a~r,1 n <br />NILEX <br />April 1, 1992 <br /> <br />MILE'. <br /> <br />F-4?C T-~14 P-tJ~]1 <br />NILEX CORPORA710N <br />CPrparete Xeedquarten <br />72503 E. Euclltl Drlve <br />Sulte q10 <br />Englewood, CO, U.S-A 80111 <br />Phone. (3031790-7222 <br />Fax: 13031792~ZB10 <br />CeilfomlL Branch <br />28250 Corporate Avenue <br />Sulte D <br />Heyward, CA 90.515 <br />Phone: (51D) 8874890 <br />Fex: (510) 8874289 <br />Homestake Mining Company <br />9145 Sunshine Canyon Rd. <br />Boulder, CO 80302 <br />RE: REPAIRS TO EXISTING LINER (HOPE 30 mil) <br />AT'IN: Wayne Tatman, <br />iaF'E '.31 ' 9~ L;:2Et <br />sss <br />Uleh Bnncn <br />4885 South 900 East <br />Sulte M213 <br />Shct Lake Clty, UT 84717 <br />Phone: (801)281$885 <br />Fax: (901) 2839898 <br />Regarding our conversation earlier today, Nilex proposes to use <br />an extrusion welder to repair the liner. This process is achieved <br />by heat tacking a piece of HOPE materisl over i:l1e tear in the <br />liner, the overlap shall be 6" or greater. The new seam is then <br />grounJ with a grinder to 1~emove an oxidization layer that exists <br />on all HOPE liner. The welder itself consists of an AEG drill motor <br />that will process the HOPE resin through a heating band at the <br />end of the welder. The extrudate coming out of the welder will <br />be approrcimately 320 degrees Fahr-enlieit. Thr.. welder is egllipped <br />with a preheat nozzle mounted 1/4 of an inch in front of the die. <br />Thia prelleat nozzle blows hot six• (approximately 300 degrees <br />Fahrenheit) directly onto the seam seconds hefoi•e the extrudate <br />bonds the seam together. The bead of extrudate is allowed to cool <br />do.rn, then the seam is vacuum tested for leaks. <br />To further our discussion regarding the hot wedge welding <br />method, you should note that this welding procedure is rarely <br />used for making repairs to the liner. The hot wedge welder has <br />great difficulty in making even a large radius. It slso requires a <br />starting and ending opening to enter and come out of the seam. <br />If welding with the hot wedge is attempted in the middle of a <br />panel the cuts made to enter and exit the seam need repair that <br />can only be made by the extrusion welding process. <br />Thank You <br />Nilex Corporation <br />en Brown <br />stimator <br />