BUZZ-Endeavour Silver Corp: Best intra-day pct gain in over 6 years
** Canadian silver miner's U.S.-listed shares up 15.2 pct at $2.16
** Stock rises as much as 21.3 pct to $2.28, its biggest pct gain in more than six years
** Company reports smaller-than-expected Q4 loss helped by weaker Mexican peso, lower direct production costs and lower inventories
** About 1.8 mln shares traded vs 25-day moving avg of 1 mln
** Through Thursday, stock had risen by a third this year
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