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American Tunnel AT004/001 <br /> Sunnyside Mine thru May 18,1989 <br /> 13 <br /> 12 <br /> 11 <br /> 10 <br /> 9 <br /> a 7 <br /> c 6 <br /> N <br /> 5 <br /> 4 <br /> 3 <br /> 2 , <br /> 1 <br /> Q <br /> Apr-87 Jun-87 Oct-87 Dec-87 Mar-88 Jun-88 Sep-88 Dec-88 Feb-89 May-89 <br /> DATE <br />