Dormant mineral deadline calculator
Enter the date a severed mineral interest was last used and the state it sits in. The calculator returns the date the interest can be treated as dormant, how long that is from today, and the exact acts that reset the clock under that state law. It covers all 14 states that let an interest lapse through nonuse, and explains the states that use a different mechanism or none at all.
Quick answer: This calculator estimates whether a severed mineral interest is at risk of lapsing. Enter the date the interest was last used and the state it sits in, and it applies that state's dormancy or prescription period to show the deadline and whether the clock may have run. It is an estimate for orientation, not legal advice.
How it works
For a state with a dormant mineral act, the deadline is simply the last use date plus the statutory period, which runs from ten years in Louisiana to thirty in Oregon. The figure that matters is what counts as use, because any qualifying act before the deadline starts the clock again. The calculator shows that list for each state, drawn from the statute itself.
What counts as a last use date
Depending on the state, a recorded sale, lease, mortgage, or transfer, a drilling or mining permit, actual production, or a recorded statement of claim or notice of intent to preserve all reset the clock. Louisiana is the strict outlier: only good faith drilling or production interrupts its ten year prescription, and recording a document does not. Use the most recent of any of these as your last use date.
Sources
Periods, categories, and the acts that reset the clock come from the Mineral Rights Laws by State dataset, compiled from each state code and published under a Creative Commons Attribution 4.0 licence. See the press kit for the downloadable data and citation files.
This tool performs date arithmetic on published statutory periods. It is general information, not legal advice, and does not account for notice already served, pending litigation, or facts specific to your title. Confirm against the current state code or a licensed attorney before acting. Corrections go to offers@americanmineralregistry.com.