BUZZ-Silver Wheaton Corp: Q2 revenue beats as production rises
** Canadian mining investment company's shares up 4.5 pct at C$18.06
** Company produces more silver equivalent ounces in Q2 due to higher output from Salobo mine in Brazil and start of production from Constancia mine in Peru
** Silver Wheaton also reports higher-than-expected Q2 revenue and earnings, helped by strong production
** Company says it repaid $85 mln debt in Q2
** Silver Wheaton continues to generate "meaningful cash flows in low commodity price environments," Raymond James analysts write in note
** Up to Tuesday's close, stock had fallen about 27 pct this year
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