** Andean Silver ASL.AX slips as much as 13.9% to A$1.8, lowest since November 28
** Stock set for its weakest trading session in more than five months
** Mineral explorer to raise A$30 mln ($19.9 million) via placement
** Offer price of A$1.85/share represents 11.5% discount to last close
** Funds will be used to accelerate drilling activities in Chile's Cerro Bayo Silver-Gold Project
** YTD, ASL surges ~125%
($1 = A$1.5056)
(Reporting by Aamir Sheik Khalid in Bengaluru)
((Aamir.SheikKhalid@thomsonreuters.com))