BUZZ-Silvercorp Metals Inc: Quarterly profit
** Low-cost Canadian silver miner's U.S.-listed shares up 11.2 pct at $1.29
** Toronto-listed shares up 9 pct at C$1.46
** Company reports Q3 profit, compared with year-ago loss, helped by higher production
** Gross margins rise, helped by lower costs
** Sales jump 31 pct
** Up to Thursday's close, U.S.-listed stock had fallen more than 50 pct this year
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