BUZZ-Richmont Mines Inc: Worst day in 16 months after Q4 loss
** Canadian gold miner's shares down 5.6 pct at C$6.24
** Stock falls as much as 12 pct, biggest intra-day loss in 16 months
** Swings to loss in Q4, hurt by lower gold prices and higher costs
** Up to Friday's close, stock had risen 64 pct in 12 months
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