** Shares of copper developer Cyprium Metals climb as much as 52.6% to A$0.029, their biggest intraday gain since July 2020
** Stock hits its highest level since Oct 29
** Co says it rejected a non-binding buyout offer from Appian Capital Advisory LLP at an indicative offer price of A$0.035 per CYM share
** Offer price at an 84% premium to stock's last close
** Says offer price does not reflect co's inherent value, and noted that some conditions outlined in the offer could be difficult to satisfy
** About 5.6 mln shares change hands, 3.4 times the 30-day avg of 1.6 mln shares
** As of last close, Cyprium stock down 36.7% YTD
(Reporting by Himanshi Akhand in Bengaluru)
((Himanshi.Akhand@thomsonreuters.com;))