By Alex Richardson
SINGAPORE, Dec 29 (Reuters) - Japanese stocks crept higher on Wednesday as investors hunted bargains in one of the developed world's cheapest markets, but Australia's main index fell as bad weather hit shares in mining heavyweights.
The dollar was steady after an erratic previous session that saw it touch a six-month low below 82 yen and rebound sharply from a record low against the Swiss franc .
A weaker dollar had lifted demand for commodities priced in the U.S. currency, and London Metal Exchange copper rose to a record $9,437.50 a tonne on Wednesday, boosted also by a stoppage at a key port in major producer Chile.
Copper's strength failed to support mining giants Rio Tinto and BHP Billiton , which both fell more than 1 percent as heavy rain disrupted mining and shipping operations. China's Christmas Day interest rate rise also prompted investors to fret about weaker demand for industrial metals, but analysts said the impact was likely to be short-lived.
"The Chinese rate rise was key but it appears it is more about curbing inflation and demand for base metals will not fall sharply," said Ben Potter, research analyst at IG Markets.
Tokyo's Nikkei rose 0.2 percent, despite the stronger yen that hurt some big exporters such as Canon Inc . The Nikkei has climbed more than 12 percent since early November, although it is down 2 percent for the year.
With shares trading around 1.1 times book value, Japan remains one of the cheapest developed markets after debt-hit Ireland, Greece and Italy.
MSCI's broadest index of Asia Pacific shares outside Japan was also up 0.2 percent and has risen more than 13 percent this year. Australia's benchmark bucked the regional trend, falling 0.4 percent as the big miners weighed.
DOWNBEAT DATA
U.S. shares eked out gains on Tuesday on strength in oil majors such as Chevron and Exxon Mobil , although downbeat consumer confidence data kept gains in check. The Dow Jones industrial average gained 0.2 percent and the broader S&P 500 was up 0.1 percent.
Foreign exchange trading was typically choppy in thin year-end trade, when light volumes can cause exaggerated moves from modest flows of funds.
A spike in U.S. Treasury yields boosted the allure of the U.S. currency, with the dollar index , which measures its performance against a basket of major currencies, steady around 80.3, off an overnight low of 79.596.
The dollar bought 82.30 yen, and the euro stood at $1.3125, retreating from a two-week high around $1.3274 the previous day.
The slide in U.S. Treasuries prompted a similar retreat for Japanese government bonds, with March 10-year futures <2JGBv1> down 0.29 point and the 10-year yield up 3.5 basis points.
Oil eased a little on forecasts of warmer weather in the blizzard-hit northeastern United States, the world's biggest heating oil market. Benchmark U.S. crude futures fell 10 cents to $91.39 a barrel.