UPDATE 1-Thai Banpu plans $466 mln investment, wary on outlook

* Plans $466 mln investment over 6 years

* Falling sale prices to hit revenue growth in 2010

* Shares jump over 3 pct to hit highest in nearly a month (Adds details, share price)

By Pisit Changplayngam

BANGKOK, Nov 11 (Reuters) - Banpu BANP.BK, Thailand's largest coal miner, said on Wednesday it planned to invest $466 million over the next six years, but warned lower average selling prices in 2010 would mean just single-digit revenue growth.

"Most of our investment money for existing projects will be spent on coal rather than the power business," Chief Executive Chanin Vongkusolkit told reporters, referring to spending plans starting next year.

Of the total investments, $189 million would be for coal mining projects in Indonesia, $22 million for its coal business in China and the rest for its 40 percent owned Hongsa lignite power plant project in Laos, Chanin said.

Under the plan, the company aimed for total coal production in China and Indonesia to rise to 33.5 million tonnes, he said, without giving a comparison.

Banpu is also the fourth-biggest coal miner in Indonesia with five coal mines, and has three in China. It is now on the lookout for new assets in the region, mainly in Indonesia and Australia.