Other mineral exports included petroleum refinery products and alumina.

Although crude oils generally do not contain olefins, they are formed in many of the processes used in a petroleum refinery.

As of 2002, there were 130 petroleum refineries worldwide producing 172,000 tons per day of petroleum coke.

This crucial conversion process enables petroleum refineries to obtain gasoline, aviation fuel, and olefinic gases through the conversion of hydrocarbon fractions at high temperatures.

Petroleum refineries are being built in the area.