Greencastle Resources Ltd. is an investment company, which engages in the exploration of gold, base metals, oil, and gas. The company is headquartered in Toronto, Ontario. The company also has strategic investments in other companies. Its segments include investments in private and public companies, oil and gas interests, and mining interests. The firm's investment segment comprises its investment in marketable securities and investment in private and public companies. The oil and gas segment comprises its oil and gas interests. The mining segment comprises its mining interests in Canada and in the United States of America. The company has a royalty interest in one oil and gas property in Alberta. The company holds a royalty interest in wells located in the Spirit River area, NW Alberta. The firm holds 50% interest in a 95% interest held by Criterium Energy in a quarter section of land in Alberta, called the Ferrier Project. The company also holds an interest in the Jewel Ridge property lease.