A mineral owner with potential for substantial gain due to mineral interests should get a good oil and gas lawyer and a good lease negotiator. A lawyer's job is to prevent you from being damaged, sometimes at the expense of making a deal. A negotiator's job is to get you the best deal. One of the best defenses against unforeseen consequences is to learn as much as possible about what that document, the lease, contains. The main clauses of a typical lease are examined.