Greencastle Resources Ltd. engages in the exploration and evaluation of gold, base metal, oil and gas properties, and royalties in Canada. It operates through Investments in Private and Public Companies; Oil and Gas Interests; and Mining Interests segments. The company holds 50% interest in the Ferrier oil and gas project located in Alberta. It also holds royalty interests in wells located in the Spirit River area, NW Alberta. Greencastle Resources Ltd. was founded in 1996 and is headquartered in Toronto, Canada.