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i <br /> A-72 Project Period <br /> N departure of zinc concentration <br /> 4 <br /> I <br /> 3 Apr 9 Apr 98 <br /> — 2 _ <br /> Dec 96 e <br /> CD1 Dec 97 keb99 <br /> �- Feb 98 <br /> Aug 96Oct 96 n 97 ct 9 <br /> N O <br /> L OLi <br /> u <br /> Act 97 <br /> 0 <br /> Jun 9 9 <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 3233 <br /> Period <br />