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A-72 Project Period <br /> N departure of zinc concentration <br /> 4 <br /> 3 Apr9 Apr98 <br /> C 2 Dec96Feb <br /> b <br /> in Dec97 <br /> 1 Feb98 eC pr9 <br /> n97 <br /> Aug96Oct96 <br /> I N <br /> Oct9 <br /> I <br /> E <br /> 0 <br /> Jun9 u9 ct97 <br /> Z -1 Jun98Aug98 <br /> Jun9 <br /> 3 I I I I I I I L -1 1 1 1 <br /> 1 2 3 4 5 6 7 8 9 1011 12 13 14 1516 17 18 19 20 2122 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 <br /> Period <br />