* China rate hike rekindles inflation concerns
* Spot gold targets $1,550 -technicals
* Grasberg mine strike continues, output halted
* Coming up: ECB rate decision for July; 1145 GMT (Updates prices)
By Rujun Shen
SINGAPORE, July 7 (Reuters) - Gold prices edged higher on Thursday, building on three days of gains, supported by inflation concerns that are pushing central banks to raise rates, while an ongoing debt crisis in the euro zone also underpinned sentiment.
China hiked rates by 25 basis points on Wednesday, and the European Central Bank is expected to follow suit later on Thursday.
"The rate move reignited the inflation issue and people started to think that it is more of an issue than expected," said Jonathan Barratt, managing director at Commodity Broking Services in Sydney.
"We can safely agree that the $1,480 to $1,500 level has been established as a medium-term support and chances that we break below it towards the end of the year are pretty rare. We've found the bottom."
Spot gold dipped briefly below $1,480 an ounce on July 1 to a one-and-a-half month low of $1,478.01, but had risen 3.7 percent from this level to $1,532.61 an ounce by 0609 GMT.
It hit a two-week high of $1,533.45 in the previous session, just over $40 below the record high above $1,575 seen at the start of May.
U.S. gold
Investors are also watching the weekly initial jobless claims and ADP employment reports from the United States, which will shed light on the key monthly non-farm payrolls data due on Friday.
Technical analysis showed a supportive picture. Spot gold is targeting $1,550, riding on the strong momentum built up in the past few sessions, said Wang Tao, a Reuters market analyst.
Silver prices also pushed higher. Spot silver rose to
a two-week high of $36.26, before easing to $36.16. U.S. silver
Supporting sentiment, a strike by about 8,000 workers at Freeport-McMoRan Copper & Gold's Grasberg mine in Indonesia, the world's top gold mine, entered its fourth day. Negotiations over pay have broken down and mining has halted, a government official said.
Physical buyers have moved to the sidelines after prices ran up about $55, or nearly 4 percent, in the past three sessions.
"We may see the market rest a little at the current level, as people wait for further development in the euro zone's debt crisis," said a Hong Kong-based dealer, adding that fund activity in gold has been limited, making it difficult to stage a rapid rally.
Holdings in the SPDR Gold Trust , the world's largest gold-backed exchange-traded fund, remained unchanged at 1,205.809 tonnes, their lowest since mid-June.
Holdings in the iShares Silver Trust , the world's biggest silver ETF, dropped to 9,532.4 tonnes, the lowest since Sept. 22, 2010.
(Editing by Clarence Fernandez)