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A-72 Project Period <br /> N departure of zinc concentration <br /> 4 <br /> 3 Apr 9 Apr 98 <br /> m 2 Dec 96Feb <br /> a eb9�, <br /> W Dec 97 <br /> 1 n 97 Feb 98 ec9 <br /> Aug 960ct 96 Oct 9� <br /> ca 0 Q �E Jun 9� EIZ�ct 97 <br /> O <br /> Z -1 Jun 98Aug 98 <br /> -2 <br /> -3 <br /> 1 2 3 4 5 6 7 8 9 1011 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 />