** Red Metal RDM.AX rises as much as 3.7% to A$0.14; marks biggest intraday pct gain since March 10
** Copper explorer agrees to JV with critical minerals explorer Chalice Mining CHN.AX
** Says JV for exploration licences in co's Callabonna copper-gold project in Australia
** CHN up 2.4% to A$1.495
** YTD, RDM gains 3.7%, CHN trims losses to 32.9%
(Reporting by Aamir Sheik Khalid in Bengaluru)
((Aamir.SheikKhalid@thomsonreuters.com))