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A-72 Project Period <br /> N departure of zinc concentration <br /> 4 <br /> 3 Apr Apr98 <br /> li <br /> 2 <br /> Dec9Oeb <br /> N 1 Dec97 <br /> b Oct <br /> o Feb98 p <br /> L Il I milli n97 c <br /> Aug963ct96 O0 maw ct <br /> N <br /> Jun g <br /> im <br /> 0 ct97 <br /> Z -1 Jun9$kug98 Jun g99 <br /> -2 <br /> i <br /> 1 2 3 4 5 6 7 8 9 1011 1213141516171819 20 2122 23 24 25 26 27 28 29 30 3132 33 34 35 36 37 38 39 40 4142 <br /> Period <br />