Attached please find a press release on: Australian base metal focussed exploration and development company Ironbark Gold Limited (ASX: IBG) has reached a significant milestone in the development of its wholly owned Citronen lead/zinc project in northern Greenland through the execution of a significant equity/ off-take agreement with Nyrstar NV, the world's largest zinc metal producer and one of the world's largest primary lead smelting and refining companies.