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A-72 Project Period <br /> N departure of zinc concentration <br /> 4 <br /> 3 Aprg Apr98 <br /> I <br /> 2 Dec96Feb <br /> � d <br /> N 1Dec97 <br /> n97 Feb98 ecpr9 <br /> Aug96Octg6 Oct9 <br /> N <br /> N 0 <br /> E Jun9ll ug ct97 j <br /> Z -1 Jun98Aug98 ug99 <br /> Jun9 <br /> -2 I� <br /> -3 <br /> 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 2122 23 24 25 26 27 28 29 30 3132 33 34 35 36 37 38 39 <br /> Period <br />