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METALS-London copper buoyed near 3-week peak on supply worries

(Adds comment, detail; updates prices) MELBOURNE, May 26 (Reuters) - London Metal Exchange copper hovered near its highest in three weeks on Friday, supported by supply concerns after news of further disruption at Indonesia's Grasberg, one of world's biggest copper mines. Freeport McMoRan Inc said on Thursday that mining and milling rates at its Grasberg mine in Papua, Indonesia have been affected by an extended strike, and a "large number" of about 4,000 absentee workers were deemed to have resigned.

"Supply disruptions are an ongoing issue," said analyst Amy Li of National Australia Bank in Melbourne. "It's supportive for prices, but should already be priced in. On the demand side, China is gradually slowing down, and we haven't seen much from the U.S. - they promised a big infrastructure package but no details yet." NAB sees a largely balanced market for 2017 and a small surplus in 2018, with prices averaging $5,720 a tonne.

* LME COPPER: London Metal Exchange copper traded at $5,730 a tonne at 0710 GMT, up 0.1 percent after a small gain the previous session. Prices on Thursday tipped the highest since May 3 at $5,768.50 and have held in a wider $5,480-$5,800 range since mid-April.

* SHFE COPPER: Shanghai Futures Exchange edged up 0.2 percent to 46,000 yuan ($6,708) a tonne as traders closed out positions ahead of a long weekend.

* HOLIDAYS: The London Metal Exchange and Shanghai Futures Exchange will be closed on Monday for a long holiday weekend.

* NICKEL: LME nickel was facing a 3-percent weekly loss, after trade data this week showed that the Philippines is ramping up ore exports to China, fueling concerns of oversupply.

* CHINA CREDIT: China's structural reforms will slow the pace of its debt build-up but will not be enough to arrest it, and another credit rating cut for the country is possible down the road unless it gets its ballooning credit in check, officials at Moody's said.

* PREMIUMS: China bonded copper premiums jumped $10 to $75, off the year's lows to the highest since March amid drawdowns from Chinese exchange inventories. Premiums for zinc to China on a cost insurance and freight basis rose $5 to $135, the highest since March 2016. <0#BASEBW-SHMET> <0#BASECIF-SHMET>

* COMING UP: U.S. durable goods for April at 0230 GMT PRICES

BASE METALS PRICES 0709 GMT Three month LME copper 5729.5 Most active ShFE copper 46000 Three month LME aluminum 1963.5 Most active ShFE aluminum 14085 Three month LME zinc 2647 Most active ShFE zinc 22315 Three month LME lead 2110.5 Most active ShFE lead 15980 Three month LME nickel 9065 Most active ShFE nickel 75190 Three month LME tin 20390 Most active ShFE tin 144750

BASE METALS ARBITRAGE

LME/SHFE COPPER LMESHFCUc3 57.01 LME/SHFE ALUMINIUM LMESHFALc3 -1600.15 LME/SHFE ZINC LMESHFZNc3 428.35 LME/SHFE LEAD LMESHFPBc3 -1458.51 LME/SHFE NICKEL LMESHFNIc3 1458.68

($1 = 6.8577 Chinese yuan renminbi)

(Reporting by Melanie Burton; Editing by Richard Pullin and Joseph Radford)