According to the article on MineSite.com, they bought a drill...

According to the article on MineSite.com, they bought a drill rig rather than pay the high cost of listing on AIM.
See:

http://www.minesite.com/nc/minews/singlenews/article/citigold-corporation-presents-a-ripping-tale-of-the-outback/1.html

“on the corporate side, Citigold has taken two unusual “stock market” steps. It is listing on the Dubai International Financial Exchange, joining the tier-one South African miner, Gold Fields, which listed in Dubai last November. And the small Australian miner has declined invitations to list on London’s Alternative Investment Market: “because it’s too expensive,” said Towsey. “We looked at the cost of around A$600,000, and figured we could buy a new drill rig for A$460,000, plus the drill string for the same price as a London listing.” And very sensible too as it does not look as if the company needs money and any investor in London with a half-sensible broker can trade on the ASX anyway.”