BUZZ-Endeavour Mining: Worst day in 3 months on stock offering
** Canadian gold miner's shares down about 7.5 pct at C$20.05
** Stock falls as much as 8.6 pct, its biggest intraday pct fall in more than 3 months
** Company says it agreed to issue nearly 6.3 mln shares at C$20/share to underwriters led by BMO Capital Markets
** Offering, about 7.4 pct of outstanding shares as of May 12, is priced at a discount of 7.7 pct to stock's Monday close
** About 2.3 mln shares traded, 3.8x stock's 30-day moving avg
** Up to Monday's close, stock had nearly tripled its value this year
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