BUZZ-Cameco Corp: Files for preliminary shelf offering
** Canadian uranium producer's U.S.-listed shares down 3.5 pct at $17 premarket
** Company on Tuesday filed for preliminary shelf offering of up to $1 bln for next 25 months in Canada and United States
** Offering includes common shares, preferred shares, warrants, subscription receipts, and debt securities
** Up to Tuesday's close, Cameco shares had fallen 15 pct this year
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