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A-72 Project Period <br /> N departure of zinc concentration <br /> 4 <br /> 3 Apr 9 Apr 98 <br /> 2 Dec 96 Feb 9 <br /> N Dec 97 <br /> 1 <br /> 'g Aug 96 Oct 96 un 97 Feb 98 <br /> oil <br /> _N <br /> � <br /> 0 <br /> Jun 9:9 Act 97 <br /> Z -1 Jun 98 <br /> -2 <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 <br /> Period <br />