Mansour Moazami, who holds the planning brief among the Islamic republic's five deputy oil ministers, said the numbers were 20 per cent above forecasts and they would rise further.
"When the government took office, exports were around 700,000 barrels per day," Moazimi was cited as saying by Mehr, a semi-official government news agency.
He said the updated figure of 1.2 million was supplemented by 200,000 barrels per day of derivative gas products from crude.
Iranian President Hassan Rouhani, a reputed moderate who succeeded hardliner Mahmoud Ahmadinejad, was elected in June, taking office in August.
The rising oil exports come as Iran and world powers prepare for a fifth round of talks next month aimed at a long-term deal on curbing the Islamic republic's disputed nuclear programme.
Despite the higher numbers, Iran's oil exports remain heavily down on shipment levels before sanctions - the country was shipping 2.5 million barrels per day of crude abroad in late 2011.
Under a preliminary deal signed last November, Iran agreed to freeze some nuclear activities for six months, which led to modest sanctions relief and a promise from Western powers of no new restrictions on its hard-hit economy.
Iran has fervently rejected Western and Israeli suspicions that its atomic programme is masking a covert weapons drive.
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