Mineral interests in properties include (1) a fee ownership or lease, concession or other interest representing the right to extract oil or gas subject to the agreed upon terms; (2) royalty interests, production payments payable in oil or gas and other non-operating interests in properties operated by others; and (3) agreements with foreign governments according to which an entity participates in the operation of the properties or otherwise serves as producer of the underlying reserves. Properties do not include other supply agreements or contracts that give the right to purchase, rather than extract, oil and gas