BUZZ-Australia's Metallium rises on offtake deal with US firm

** Shares of Metallium MTM.AX rise as much as 7.1% to A$0.60

** The critical metals miner says its unit executed long-term off-take agreement with U.S. materials refiner Indium Corporation

** Adds, under deal unit to supply Indium with gallium, copper, tin, gold

** Stock down over 40% this year, including the day's move