Zinc and gold producer Ironbark soared by over 70 per cent this week to its highest level in over a year following the release from a trading halt as it announced a $5 million share sale. Ironbark's shares soared after it sold a 19.9 per cent stake to Nyrstar, the world's largest zinc producer, for about 3.5 million euros ($5.1 million). Ironbark has agreed to grant Nyrstar a life-of-mine off-take agreement for 35 per cent of production at Ironbark's Citronen base metal deposit in Northern Greenland, where production is not due for three to five years. Ironbark has now completed its 2009 drilling program at Citronen, but the company doesn't believe the results will change resource estimates gauged from 2008 testing. Nyrstar also has agreements to buy zinc mines from Ironbark's 18 per cent shareholder commodities trader Glencore International.