We have a supply of at least 10 billion barrels of petroleum, in what we already know of the resources of the United States. From these vast resources we produced last year over 200,000,000 barrels of oil.
In addition we produced natural gas to a value of at least 65,000,000. In other words, leaving out of consideration copper and iron, the oil and gas of the United States was worth more than the gold, silver, lead, and every other metal product produced in the same length of time.