Sell Mineral Rights in Union County, AR

El Dorado has been an oil town since 1921, and the same Smackover Formation that made it one is now the center of a lithium brine build-out that touches almost every old royalty deed in the county.

Union County is where the Arkansas oil business started. The 1921 discovery at El Dorado turned a farm town into a boomtown almost overnight, and companies that are still household names in the industry, Murphy Oil among them, trace their roots to that field. A century later the Smackover Formation under the county is doing something different: instead of oil, operators are pulling lithium-rich brine out of the same limestone and pumping it toward processing plants built to feed the battery supply chain.

For a mineral owner, that history shows up as layers. Some tracts still carry small legacy oil and gas interests from the 1920s through 1980s, often split many ways across heirs who never formally probated the estate. Other tracts sit inside newer brine unit boundaries staked by Standard Lithium, ExxonMobil, and other operators working the South Arkansas play. A few carry both. Knowing which kind of interest you hold, and what it is actually producing or leased for, is the first step before any conversation about selling.

Legacy Smackover Oil vs. Brine Minerals

Arkansas law and most modern lease forms treat oil and gas rights and the brine or 'other minerals' rights as separate bundles, even when the same instrument once conveyed both. A deed from the 1930s oil boom may say nothing specific about lithium, bromine, or brine, which means ownership of those rights can hinge on the exact conveyance language and how courts and title examiners have read similar Smackover deeds. Bromine production has operated in this corner of Arkansas for decades, so there is precedent for how 'other minerals' clauses get interpreted, but every deed still needs its own read.

This is the reason offers on Union County tracts vary so much even between neighbors. A parcel with clean brine rights inside an active unit is a different asset than a parcel where the mineral deed is ambiguous or where a working interest was carved out generations ago and never released.

What's Actually Moving in the County

El Dorado remains a working oil field with strippers and secondary-recovery wells still on the books, and royalty statements from those legacy units tend to be small and declining, which is normal for a field this old. The newer activity is brine-focused: permitting, unit formation, and infrastructure tied to lithium extraction have picked up meaningfully in the South Arkansas Smackover trend that runs through Union, Columbia, and neighboring counties. Depending on where a tract sits relative to unit boundaries and processing infrastructure, that can materially change how a buyer prices the interest, but any number quoted to you should be tied to comparable recent activity and hedged to reflect that the play is still developing, not a fixed promise.

Getting Your Union County Interest in Order

Start at the Union County Circuit Clerk's office in El Dorado, where the deed and probate records live. Many mineral tracts here were never formally divided among heirs after the original owner passed, which means several family members may hold undivided fractional interests without a clean paper trail. If your interest passed through inheritance, a title check will usually surface whether an affidavit of heirship or probate is needed before a sale can close.

Once ownership is clear, a serious buyer will want a copy of your most recent division order or royalty statement if you have one, the legal description (section, township, range), and any lease or brine unit paperwork you've received. If you've never received anything, that's useful information too. It tells a buyer your interest may be unleased, which changes how it's valued relative to a producing tract.