Iran has converted financial reserves into gold to avoid future problems, an adviser to President Mahmoud Ahmadinejad said in comments published on Saturday, after the price of oil fell more than 60 percent from a peak in July. Iran, the world's fourth-largest oil producer, is under U.N. and U.S. sanctions over its disputed nuclear programme and is now also facing declining revenue from its oil exports after crude prices tumbled. "With the plans of the presidency...the country's money reserves were changed into gold so that we wouldn't be faced with many problems in the future," presidential adviser Mojtaba Samareh-Hashemi was quoted as saying by business daily Poul. He gave no figures or other details. Before oil prices plunged by more than 60 percent from a peak of $147 per barrel in July, Iran made windfall gains from its crude exports and in April estimated its foreign exchange reserves at about $80 billion.