In 1940, the Texas Supreme Court decided Duhig v. Peavy-Moore Lumber Co., Inc., addressing situations when a grantor of a fractional mineral interest conveys that interest by warranty deed and also reserves an interest without referencing the outstanding interests. When both the grantor and grantee cannot be made whole, the grantor is estopped from claiming the entirety, or a portion, of minerals that he or she attempted to reserve. This webinar discusses this pivotal case, subsequent cases where the Texas Supreme Court has extended or narrowed the Duhig rule, and how other oil and gas-producing states outside of Texas treat these “over-conveyancing” issues.