Long recognized as the standard work on the topic, The Oil and Gas Lease in Canada discusses the legal document that determines the process by which a freehold mineral owner may grant oil companies the right to search for and produce minerals. Subjected to ongoing litigation and governmental regulation, the Lease continues to evolve as the body of common law surrounding it grows and develops. The substances covered by the Lease are unique in that their occurrence is uncertain until discovery, and they are capable of moving from place to place within a reservoir. These qualities have led to the development of new legal concepts, basically creating a separate and distinct branch of the law. This fourth edition of The Oil and Gas Lease in Canada guides the reader through the complexities of the Lease and the legal issues attached to it. John Bishop Ballem brings the text up to date on recent developments, including changes and additions to the terms of the Lease, the effect of recent court decisions, and the growth of coal bed methane as an energy source. Of particular interest is his examination of what takes place following a Lease's involuntary termination. Ballem deals with specific examples of this situation, detailing its consequences for both individual mineral owners and companies, as well as for future judicial pronouncements. The fourth edition of The Oil and Gas Lease in Canada is indispensable for mineral owners, oil companies, land agents, lawyers, and legal institutions.