Price of Iran Gilsonite (natural bitumen) is depending on weather. If rain comes since the most of natural asphalt mines are belong to local people and exploring is not modern while rain coming whole of mine will get full of water and nobody could work on till dry season.
At this time stockers or anybody who has ready goods increasing the price and market will became hot. Some of customer who needs to pulverize the Gilsonite also are unable to do since it is wet and could not grind.
Rainy season in Gilsonite mines will start from October to March and it is tropical mode.
So Gilsonite customer is better to buy the raw material during March to October to be in safe side and do not face with lack of raw material.