Perth-based Ironbark is working towards the completion of a bankable feasibility study for its Citronen zinc and lead project in Greenland.

The company has defined a 56 million tonne resource at a grade of 6.1 per cent zinc and lead at Citronen and is aiming to isolate a 20 million tonne resource, at a grade of 12 per cent zinc and lead, to target in the first years of mining.