Ah... California law. That makes things a bit easier to explain. What follows is a California Supreme Court case dealing quite directly with the issue of fee transfer of minerals and the fact that if it's not in the deed you don't know if you own it or not. When the buyer complained that the purchase should have included the minerals he was instructed that it was his job to search the public record to discover what was being offered for sale. The royalty interest in the minerals had already been sold by the previous owner.
Callahan v. Martin
And that was all the court had to say to the buyer of the fee. His claims were dismissed because essentially he should have known better. The rest of the case deals with the actual rights to the mineral estate portion of the property as between the royalty owner and the lessee.
This is why a full title abstract is a really really good idea when buying property fee simple. Very much like a quitclaim the fee simple deed doesn't convey anything to the buyer but what the seller owned at the time they sold it. Due diligence is essential. A full title abstract should be your first step when considering a fee simple purchase. Both fee simple and quitclaim are "pig in a poke" situations. If you don't look in the barrel personally you don't know whether you bought a pig or a pile of dead cats.
When a seller provides you with statements as to the extent of what's being offered for sale you can sue for the value lost if they lied. When the seller only offers you fee simple there is no assurance that most of the use and benefits of the property aren't already sold, leased or encumbered.
Heavy Pans