** Shares of Australia's Medallion Metals MM8.AX fall 5% to A$0.38, their lowest level since November 24

** Stock set for worst day since December 4

** Gold-copper miner announces A$55 million placement at 33 AU cents per share, representing a 17.5% discount to last close

** YTD, stock has more than tripled in value

(Reporting by Shruti Agarwal in Bengaluru)

((Shruti.Agarwal@thomsonreuters.com))