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A-72 Project Period <br /> N departure of zinc concentration <br /> 4 <br /> 3 Apr 9 Apr 98 <br /> 2 <br /> Dec 96 Feb <br /> a <br /> .N Dec 97 <br /> � Feb 98 <br /> Aug 96 Oct 96 un 97 'ecl9ll <br /> N Oct 9 <br /> � 01 <br /> 0 �Jun 91M lug Act 97 <br /> , <br /> Z -1 Jun 98 Aug 98 <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 <br /> Period <br />