** Shares of Nanshan Aluminium International 2610.HK fall 10.4% to HK$61.7, on course for biggest one-day pct drop since July 7
** Stock hits the lowest since Jan 19 on its second session of decline
** Indonesia-based alumina producer is selling 31 mln new shares to its controlling shareholder in share sale, raising $256 mln for its potential electrolytic aluminium and related raw materials and ancillaries businesses
** The new shares will be offered at HK$64.50 each, representing a 6.4% discount to Wednesday's close of HK$68.90 apiece
** The controlling shareholder will buy the new shares following a sale of the same amount of existing shares at the same price to third party investors
** YTD, stock up 29.6%, benchmark Hang Seng Index .HSI up 3.8%
(Reporting by Donny Kwok)
((donny.kwok@thomsonreuters.com))