RS 31:145: After-acquired title doctrine; applicability in absence of special clause

If, in the absence of an express provision of the kind contemplated by the preceding Article, a party purports to grant a mineral lease on land or mineral rights that he does not own, any title thereto he subsequently acquires inures to the benefit of the lessee. Successors in title of the original lessor are not bound under this Article unless they agree expressly and in writing to become so bound.