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A-72 Project Period <br /> N departure of zinc concentration <br /> 4 <br /> 3 Apr 9 Apr 98 <br /> i <br /> 2 Dec 96Feb <br /> 71 <br /> 1 Dec 97 <br /> eb9 <br /> Feb 98 <br /> n 97 Jec9 ' <br /> Aug 960ct 96 Oct 9 <br /> E Jun 9 lug Act 97 <br /> 0 <br /> Z -1 Jun 98Aug 98 <br /> _3 L--L L <br /> 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 <br /> Period <br />