"Recent exploration activities revealed the presence of diverse sources of uranium in various locations," Energy Minister Prince Abdulaziz bin Salman tells a minerals conference.
The step was seen as a significant step taken by Iran's nuclear programme in response to the UN nuclear watchdog resolution calling for Tehran to cooperate in its probe.
Iran has been adding them to two underground sites at Natanz and Fordow, which may be designed to withstand potential aerial bombardment.
Iran agrees to provide information to the UN nuclear watchdog and answer questions posed by IAEA, which will lead to the parties meeting in Tehran.
American nuclear power generation companies lobby White House against sanctioning uranium imports from Russia, according to Reuters news agency, despite US and its allies piling harsh sanctions on Moscow over its invasion of Ukraine.
While Russia is the most influential power in Kazakhstan, the Netherlands and the US are the two biggest investors in Central Asia’s largest state.
Iran and Russia both gave positive views about talks that kicked off this week to salvage Tehran's 2015 nuclear deal with global powers, although Western nations have said the negotiations are going too slowly.
Iran's head of nuclear energy Mohammad Eslami has said Tehran's targets related to enriching uranium are meeting its industrial and production needs.
Tehran has progressively abandoned its commitments to a 2015 nuclear deal, from which then US president Donald Trump pulled Washington out in 2018.
Islamabad calls for "thorough investigation" after Indian police arrested two men in western Maharashtra state for illegally possessing seven kilogrammes of highly radioactive substance.
The talks are aimed at determining which sanctions the United States should lift and the measures Iran has to take in order to rein in Tehran's nuclear programme.
Since January, Iran has begun enriching uranium at up to 20 percent purity, a technical step away from weapons-grade levels.
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