By Ahmed Rasheed and John Davison
Ghadhban said Iraq wanted to see the "actual decrease" before Baghdad and other members of the Organization of the Petroleum Exporting Countries decide how to deal with a reduction in Iranian shipments.
"I want to wait and see how much is the actual physical decrease in Iranian exports, and whether this would be compensated by not only OPEC producers but by other countries," he told Reuters in his first interview since taking over the oil portfolio last month.
"What will be the physical increase in demand on Iraqi oil ... if there's no demand, how can I say we'll compensate?"
"I compare it with previous prices ... when we talk about prices above 70 ... I say it's a fair price, it's not 30 or 50 and it's not 100.
"In principle, the higher the price, the better for Iraq. But we're not working alone .. we're a member of OPEC. We see the interests of consumers and we want to be a viable producer and exporter," Ghadhban said.
The United States on Monday restored sanctions targeting Iran's oil, banking and transport sectors and threatened more action to stop what Washington called its "outlaw" policies - steps that Tehran called economic warfare and vowed to defy.
A U.S. official confirmed Iraq had been granted a waiver to import some Iranian products. Iraqi officials said last week Baghdad would still be allowed to import crucial gas and energy supplies for its power stations as well as food items.
(Reporting by John Davison and Ahmed Rasheed; Editing by Dale Hudson)
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