"The technical talks will be resumed tomorrow and continue until Friday" in Geneva, Michael Mann told AFP via email.
The experts held four days of talks in Vienna last week but the Iranians walked out after Washington expanded its sanctions blacklist against Tehran.
Iran's state broadcaster quoted deputy foreign minister Abbas Araqchi as saying the two days of talks could be extended to the weekend.
He said Tehran was prepared to continue the talks after Ashton "made the assurance that the world powers, particularly the United States, will continue the talks in goodwill... And that they are serious about implementing the deal".
But the United States last week put a dozen overseas companies on a blacklist for evading its sanctions, angering Tehran even though Washington said the new measures did not constitute new sanctions.
Tehran said the measures were "against the spirit" of the November 24 deal.
Foreign Minister Mohammad Javad Zarif expressed Iran's "discontent" in a phone call with US Secretary of State John Kerry, Iranian news agency Fars reported on Monday. The State Department confirmed the call took place.
Iran denies wanting nuclear weapons, but many in the international community suspect otherwise, and neither Israel -- widely assumed to have nuclear weapons itself -- nor Washington have ruled out military action.
The six powers, known as the P5+1, are the United States, China, Russia, Britain, France and Germany.
Araqchi had told Belgian newspaper Le Soir yesterday that after speaking to Ashton -- the P5+1's chief negotiator -- Tehran had "decided to resume" the talks.
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