Greencastle Resources Ltd. is a diversified company. It has interests in gold and base metals exploration and oil and gas exploration and royalties. It also has strategic investments in other companies. Its segments include investments in private and public companies, oil and gas interests, and mining interests. Its investment segment comprises its investment in marketable securities and investment in private and public companies. The oil and gas segment is comprised of its oil and gas interests. The mining segment is comprised of its mining interests in Canada and in the United States of America. It has a royalty interest in one oil and gas property in Alberta. It holds royalty interests in wells located in the Spirit River area, north-west Alberta, and the Primate area in Saskatchewan. It also holds interest in the Jewel Ridge property lease. It holds a 50% interest in a 95% interest held by Criterium Energy in a quarter section of land in Alberta, called the Ferrier Project.