Wildcatter (noun)

A person who drills for oil or natural gas in an area not known to be an oil or gas field, in the hope of making a profitable discovery.

Origin:

From the verb "wildcatting" which means drilling for oil in an area not known to be an oil field.

Examples:

1. He was a wildcatter looking for oil in the desert.
2. She was a wildcatter who drilled for oil in the Arctic.
3. The wildcatter found a new oil field in Texas.
4. The wildcatter was a risk taker who invested his money in drilling for oil.
5. The wildcatter drilled several dry holes before hitting a gusher.