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* Second and final day of nuclear talks
* Powers hope for response to sanctions offer
By Justyna Pawlak and Fredrik Dahl
ALMATY, Feb 27 (Reuters) - World powers hope Iran will respond positively on Wednesday to their new offer to lift some sanctions if Tehran scales back nuclear activity the West fears could be used to build bombs.
The United States, France, Germany, Britain, China and Russia presented the offer when their first meeting with Iran in eight months began in Almaty on Tuesday and the Islamic state was considering it, the powers' spokesman said.
Western officials described the first day of talks as "useful". One said Iran discussed specific aspects of the powers' ideas in bilateral talks with three of them - Russia, Germany and Britain - but gave no indication how Tehran viewed them.
Iranian state television described the atmosphere in the discussions as "very serious".
The outcome of the two-day meeting in the Kazakh city will be closely watched in Israel, which has strongly hinted that it could attack Iran's nuclear sites if diplomacy and sanctions fail to stop the uranium enrichment programme.
Iran says Israel's assumed nuclear arsenal is the main threat to peace and denies Western allegations it is seeking to develop the capability to make atomic bombs. It says it is only aiming to produce nuclear energy so that it can export more oil.
In their latest attempt to break years of deadlock in the dispute, the powers are offering Iran a relaxation of some of the sanctions that are taking a heavy toll on its economy.
"Hopefully the Iranians will be able to reflect overnight and will come back and view our proposal positively," the spokesman for European Union foreign policy chief Catherine Ashton, who represents the powers in the talks, said.
"The ball is in their court," Michael Mann added after the first day of discussions on Tuesday.
He did not give details of the offer, but other Western officials have confirmed it includes some limited sanctions easing if Iran closes a underground site where it carries out its most controversial uranium enrichment work.
Diplomats and analysts see scant chances of a conclusive deal with Iran before a June presidential election, with the political elite preoccupied with domestic issues.
Wednesday's talks are due to start at around 11 a.m. (0500 GMT).
Iran would put forward its own proposal "of the same weight" as that of the other side, a source close to the Iranian negotiating team said on Tuesday, but Western officials said it had not done so during the first day of negotiations.
Iran, whose chief negotiator Saeed Jalili is close to Supreme Leader Ayatollah Ali Khamenei and is a veteran of Iran's 1980s war against Iraq and the Western powers that backed it, has shown no sign of willingness to scale back its nuclear work.
It argues that has a sovereign right to carry out nuclear enrichment for peaceful energy purposes, and in particular refuses to close its underground Fordow enrichment plant, a condition the powers have set for any sanctions relief.
Tightening Western sanctions on Iran over the last 14 months are hurting Iran's economy and slashing oil revenue. Its currency has more than halved in value, which in turn has pushed up inflation.
But analysts say the sanctions are not close to having the crippling effect envisaged by Washington and - so far at least - they have not prompted a change in Iran's nuclear course.
Western officials said the powers' offer would include an easing of restrictions on trade in gold and other precious metals if Tehran closes Fordow.
The facility is used for enriching uranium to 20 percent fissile purity, a short technical step from weapons grade.
Western officials acknowledge an easing of U.S. and EU sanctions on trade in gold represents a relatively modest step. But gold could be used as part of barter transactions that might allow Iran to circumvent financial sanctions.
Iran's foreign ministry spokesman last week dismissed the reported incentive as insufficient and a senior Iranian lawmaker has ruled out closing Fordow, close to the holy city of Qom. (Additional reporting by Yeganeh Torbati in Almaty and Zahra Hosseinian in Zurich; Editing by Robin Pomeroy)