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A-72 Project Period <br /> N departure of zinc concentration <br /> 4 <br /> 3 Apr9 Apr98 <br /> 2 Dec96Feb9 <br /> Cn <br /> 1 Dec97 Jeb9 <br /> un97 Feb98 pr9 <br /> � Aug960ct96 Oct9 <br /> N IF <br /> -FUo El <br /> Jun9 LlwEP m1u9 Qt97 <br /> 0 <br /> Z _1 Jun98Aug98 Jun99 <br /> -2 <br /> -3 <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 35 36 37 <br /> Period <br />