The move is part of the government's increasing efforts to clamp down on damage caused by the mining industry in the nation, the world's top nickel ore supplier.
The company produced 49,874 ounces of gold in the nine months to September, or 7.8% less than in the same quarter last year. It also cut its 2016 production target.
Report: Lifting of sanctions will spark double digit copper output growth in Iran, home to world's second largest copper mine and largest zinc reserves.
All involved banks will also have to produce all relevant chat room instant messages and any other written communication they exchanged, whatever the media.