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• HAWK'S NEST MINE, HY~N ION ACTIVITY (ph) • <br />USGS 50 R6 R4 <br />DATE RA R5 (RB RC SP5 RD SP4 R3 RE R2 SP2 SP1 R1 RF USGS 00 S1 S2 <br />1977 <br />October 20 7.6 <br />December 16 7.3 7 6 <br />1978 <br />February 15 8.3 <br />February 22 <br />March 7 8.1 <br />April 6 8.9 <br />April 25 7.1 7.7 <br />April 26 7.7 7.7 <br />May 8 8.1 <br />June 6 7.0 <br />July 11 8.3 <br />July 13 <br />August 14 8.2 <br />August 16 <br />November 21 7.6 7.7 7.7 7,6 <br />1980 <br />April 12 7.6 7.6 7.6 7.5 7.5 7.7 7.3 <br />July 14 7.6 7.5 7.7 7.8 7.7 7.7 7.8 <br />October 9 8.1 8.0 <br />October 10 7.7 7.7 7.6 7.9 <br />November 10 7.4 7.6 7.7 7.7 7,g <br />7.9 <br />8.2 <br />8.5 <br />7.5 <br />8.2 <br />8.4 <br />7.7 7.9 <br />7.5 1.8 <br />7.5 <br />