ASX-listed Mount Burgess Mining said that world zinc output would have to grow by 22% on this year's production estimate of 10,6-million tons to meet expected demand by 2010.

Speaking an African-focused mining conference in Perth, on Thursday, chairperson Nigel Forrester said that new mine start-ups, production upgrades and mine closures would have to fill the expected shortfall of 2,38-million tons.

He said that China would remain the driver for higher zinc production globally.

"If China increases consumption by an average 345 000 t/y to 4,8-million tons total by 2010, and the rest of the world increases consumption by a modest 2%, total world production within three years must reach 13-million tonnes," Forrester said.

Forrester said that stocks and output would be at critical levels by early in 2008.

"The decline has been evident over recent years with London Metals Exchange stocks of 780 000 tons in April 2004 dwindling 606 500 tons in just 27 months to 173 500 tons by just a few weeks ago."

He said it represented an average daily decrease of 728 t/d over the 27 months and that it would worsen to 907 t/d this year.

Mount Burgess Mining develops the Tsumkwe diamonds and base metals and the Kihabe base metals projects along the Namibia/Botswana border.