Trafigura has already increased its foothold in nickel with an exclusive offtake agreement with Finland's Terrafame, that also produces zinc and cobalt.
South African engineering and construction group, currently subject of a takeover bid from Germany’s ATON, said projects were located in sub-Saharan Africa, North America and Australasia.
Cobalt, nickel still on the boil, but gloomier outlook reflected in copper price and fall in market value of top mining companies during first quarter.