Mineral rights under California property belong to one of three owners: a private party, the State of California, or the federal government. Which one holds the subsurface beneath any particular parcel depends on the chain of ownership stretching back to the original government patent or land grant. California treats the surface and the subsurface as two separate pieces of real property, so the person who owns a home or ranch may own nothing beneath it. To find out who owns the minerals under your land, you trace your deed backward through the county recorder’s records until you reach the point where the surface and the minerals either stayed together or were split apart.
How To Check Who Owns the Minerals Under Your Property
Start with two pieces of information: your Assessor’s Parcel Number, which appears on your property tax bill or through the county assessor’s online parcel search, and the full legal description of the land, including township, range, and section coordinates, which appears on your grant deed.
Pull a copy of your grant deed from the County Recorder’s office. Most California counties offer online access to recorded documents; some still require in-person visits or mail requests. Read the deed carefully for any reservation or exception clause mentioning minerals, hydrocarbons, oil, gas, or subsurface rights. Language like “Grantor reserves all mineral rights in and under the property” is the clearest sign that a previous owner kept the minerals when they sold the surface.
One deed only tells you about one transaction. To get the full picture, trace the chain of title backward through every recorded transfer, looking for the point where someone first carved the minerals away from the surface. The County Recorder’s grantor/grantee index is the tool for this work. Each entry links to a recorded document, and you check every one for reservation language. Recorder offices charge a small per-page fee for copies, with additional charges for certified copies.
For properties that may involve federal ownership, the Bureau of Land Management’s General Land Office Records website provides free access to more than five million federal land patents dating back to 1788.1Bureau of Land Management. General Land Office Records Search by legal land description to pull the original patent and see whether the federal government reserved the minerals when it conveyed the surface. The site also offers survey plats and field notes that help you locate your parcel within the federal survey system.2Bureau of Land Management. Federal Land Records
If the chain of title is complicated or the records are unclear, hire a landman or a title company that specializes in mineral title searches. A mistake in identifying the mineral owner can derail a lease negotiation, delay a property sale, or expose you to a quiet-title lawsuit.
When the Minerals Are Privately Owned
Most privately held mineral rights in California trace back to the original government-to-private transfer, whether that was a Spanish or Mexican land grant, a federal homestead patent, or a direct government sale. If the original deed included no reservation of subsurface resources, the private buyer received both the surface and everything underneath. Those owners could then sell, lease, or gift the minerals separately from the surface, and many did. Speculative mineral reservations are common in California conveyancing, where a seller kept the subsurface on the chance that gold, oil, or gas would eventually turn up.
A private mineral owner can negotiate leases with extraction companies, collect royalties on production, sell the interest outright, or hold it as an investment. For the surface owner, a mineral reservation buried in a decades-old deed can cloud title and make the property harder to sell or develop.
The deeper consequence is legal. When someone else holds the minerals under your land, the law treats that person as having a dominant estate. They can access the surface to the extent reasonably necessary to explore for and extract minerals, even over your objection.
Notice You Are Entitled to Before Entry
California Civil Code Section 848 requires the mineral rights holder to give you written notice before entering. The notice period depends on how disruptive the planned activity is:
- For non-disruptive activities such as surveying, water testing, or removing old equipment, at least five days’ written notice. The mineral owner must try to deliver notice in person first, and if that fails, send it by registered letter.
- For surface-disrupting activities such as drilling new wells, bringing in heavy equipment, or excavation, at least 30 days’ written notice. The notice must describe the location and extent of the operation and the approximate schedule for entering and leaving.
If the mineral owner skips the required notice, you can go to court and get an injunction blocking entry until proper notice is given. The notice requirement does not apply if you and the mineral owner already have a negotiated surface-use or access agreement. If extraction activity stops for a year or more and the mineral owner wants to resume surface-disrupting work, a fresh 30-day notice is required.
When the State or Federal Government Owns the Minerals
The State of California owns a significant mineral estate managed through the California State Lands Commission. Under Public Resources Code Section 6401, the state reserves all mineral deposits when it sells or transfers state land, making those deposits available only through a lease-and-royalty arrangement rather than outright sale.3California Legislative Information. California Public Resources Code 6401 If your property was once state land, there is a strong chance the state still owns everything below the surface. The reservation covers oil, gas, geothermal energy, and hard minerals.
The federal government is the largest mineral estate holder in California. The Bureau of Land Management oversees roughly 47 million acres of subsurface mineral estate in the state, compared with 15 million acres of surface land the agency manages.4Bureau of Land Management. What We Manage That gap exists because federal law frequently conveyed surface rights to homesteaders while keeping the minerals. The Stock Raising Homestead Act is the classic example: settlers received up to 640 acres of surface land for ranching, but the United States retained full ownership of the mineral estate along with the right to enter and extract.5Bureau of Land Management. About Mining and Minerals
If a government entity owns the minerals under your property, you cannot extract those resources yourself. Extraction requires a lease from the agency that holds the interest, and royalties flow back to the public treasury rather than to you.
Terminating a Dormant Private Mineral Right
If your title search turns up an old private mineral reservation that nobody has used in decades, California gives surface owners a way to clear it. Under Civil Code Section 883.210, the owner of property burdened by a mineral right can bring an action to terminate that right if it qualifies as dormant.6California Legislative Information. California Civil Code 883.210 A mineral right becomes dormant when its owner has taken no steps to preserve, explore, or develop the interest over a 20-year window.
The mineral rights holder can prevent termination by filing a notice of intent to preserve the interest in the county where the property sits. That filing resets the clock for another 20 years. Many holders of old speculative reservations never bother, especially when the original owner died decades ago and the heirs may not even know the interest exists.
To terminate a dormant mineral right, you file a quiet-title action in the superior court of the county where the property is located.7California Legislative Information. California Civil Code 883.240 Even after you file, the mineral owner gets one last chance: the court can allow a late preservation filing, but only if the mineral owner pays your litigation costs, including reasonable attorney’s fees.8California Legislative Information. California Civil Code 883.250
One boundary matters here. You cannot terminate mineral interests held by the federal government, the State of California, or any local public entity. Government-owned mineral rights are permanently exempt from the dormant mineral rights statute.9California Law Revision Commission. Study H-402 – Dormant Mineral Rights If the BLM or the State Lands Commission holds the minerals under your property, the dormant-rights path is not available.
If You Inherited Mineral Rights
Mineral rights are real property under California law, so they pass through probate like a house or a parcel of land. If the deceased owner had a will, the mineral interest transfers according to its terms. Without a will, California’s intestacy rules control distribution and the probate court appoints an administrator.
The practical problem with inherited mineral rights is proving clear title. Oil and gas companies will not issue royalty payments or honor a new lease until the heir can produce documentation showing the chain of ownership from the deceased to the new holder. That typically requires formal probate proceedings and a recorded deed. An affidavit of heirship is sometimes used as a shortcut, but many title attorneys and operators reject it as insufficient for valuable mineral interests.
When the deceased owned mineral rights in California but lived in another state, a separate ancillary probate proceeding in California is required in addition to the primary probate in the home state. Skipping it leaves the interest in limbo, unable to be leased, sold, or developed, and leaves it exposed to a termination action by the surface owner if it sits unused long enough.