600 BC oil wells,640 AD oil Tax,
Natural oil spring called "Eternal Fires" that had been burning continuously since at least 600 BC.
When the Muslim armies first arrived 640, they found hundreds of open oil pits. Arab records from the 10th century show that people, paid an annual tribute of 90 metric tons of oil to light the palace of the caliph. And an early Muslim taxing the oil - and mercury - producing industries in their districts as an incentive to boost production. Clearly the demand for oil was high.
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