I performed some quick calculations for 2009 revenue using September quarterly figures, current spot prices and 2009 estimates. Figures are in $AUD.
Century = $908m (35%) Prominent Hill = $594m (23%) Sepon = $398m (15%) Golden Grove = $368m (14%) Rosebery = $259m (10%) ---------------------------- Total = $2,529B
So even at current spot prices, the Century mine still creates about 35% of OZL revenue. That's too important to shut down, especially if it can be run at a marginal profit/loss.
Interestingly, with copper prices declining signifcantly since mid-year, we are still a majority zinc producer.