268. Where, after mining rights have been revoked, the mineral substances that were subject to those rights are mined or extracted, the person whose rights were revoked is entitled, as compensation from the operator, to a royalty equal to(1) in the case of petroleum, natural gas and other mineral substances associated with them, 3 % of the well head value of those substances, payable within the first twenty-five days of each month;
(2) in the case of all other substances, 2 % of the gross value of the annual production of those substances, payable on the dates fixed under section 46 of the Mining Duties Act (chapter D-15).