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American Tunnel AT004/001 <br /> Sunnyside Mine <br /> 240 <br /> 220 <br /> 200 <br /> 180 <br /> 160 <br /> 140 <br /> a <br /> E 120 <br /> V) <br /> 100 <br /> 80 <br /> so <br /> 40 <br /> 20 <br /> a <br /> Apr-87 Jun-87 Oct-87 Dec-87 Mar-88 Jun-88 Sep-88 Dec-88 Feb-89 May-89 <br /> DATE <br />