The film "There Will Be Blood" starring Daniel Day-Lewis, focuses on a prospector of which precious resource?

"There Will Be Blood" is a 2007 American epic period drama film written and directed by Paul Thomas Anderson, loosely based on the 1927 novel "Oil!" by Upton Sinclair. It stars Daniel Day-Lewis as Daniel Plainview, a silver-miner-turned-oilman on a ruthless quest for wealth during Southern California's oil boom of the late 19th and early 20th centuries. Paul Dano, Kevin J. O'Connor, Ciarán Hinds, and Dillon Freasier also feature in the film.

Petroleum, also known as crude oil and oil, is a naturally occurring, yellowish-black liquid found in geological formations beneath the Earth's surface. It is commonly refined into various types of fuels.

Sir Daniel Michael Blake Day-Lewis (born 29 April 1957) is an English retired actor with dual British and Irish citizenship. He is the recipient of numerous accolades, including three Academy Awards for Best Actor, making him the first and only actor to have three wins in that category, and the third male actor to win three competitive acting Academy Awards, the sixth performer overall.