COX 12-9 UNIT 1
COX 12-9 UNIT 1 is a Texas oil lease in Martin County, Railroad Commission district 08, operated by Endeavor Energy Resources L.P. It has 13 wellbores on file with the Commission. Reported production runs from August 2017 to August 2026, totalling 2,107,412 barrels. The lease is currently producing. Fitting a decline curve to that history and pricing the remaining production at today's forward curve values the whole lease — a 100% undivided interest — at about $20.4M, with roughly $11.5M expected over the next twelve months. An individual royalty owner receives their own decimal interest times that figure. Over the last twelve months on file it averaged 41,518 barrels a month, about 3,194 per wellbore. Its strongest month on the record we hold was January 2025, at 222,493 barrels. In our own backtest, leases producing at this rate are forecast to within about 18% of what they went on to produce, and that measured error is the range shown on the page rather than a confidence of our own devising.
Key facts about COX 12-9 UNIT 1
- Who operates COX 12-9 UNIT 1?
- COX 12-9 UNIT 1 is operated by Endeavor Energy Resources L.P., Railroad Commission of Texas operator number 251726.
- Where is COX 12-9 UNIT 1?
- COX 12-9 UNIT 1 is a Texas oil lease in Martin County, Texas, in Railroad Commission district 08. Its Railroad Commission lease number is 49245.
- Is COX 12-9 UNIT 1 still producing?
- COX 12-9 UNIT 1 is currently producing. The most recent month of production reported to the Railroad Commission of Texas for COX 12-9 UNIT 1 is August 2026.
- How much has COX 12-9 UNIT 1 produced?
- COX 12-9 UNIT 1 has reported 2,107,412 barrels of oil (bbl) to the Railroad Commission of Texas between August 2017 and August 2026, from 13 wellbores.
- How much is COX 12-9 UNIT 1 worth?
- The remaining production from COX 12-9 UNIT 1 is estimated to be worth about $20.4M in total as of 27 August 2026, within a range of $16.7M to $24.0M. That figure is the whole lease, undivided — not any one owner's share. A royalty interest in COX 12-9 UNIT 1 is a fraction of it. The estimate fits an Arps decline curve to the production COX 12-9 UNIT 1 has already reported, prices the remaining production at the current forward strip, and discounts it at 12% a year. The figure shown for COX 12-9 UNIT 1 is an estimate of value, not an offer and not an appraisal.
- How much income does COX 12-9 UNIT 1 generate in a year?
- COX 12-9 UNIT 1 is forecast to net about $11.5M across the whole undivided lease over the twelve months following 27 August 2026, before income tax. A royalty owner in COX 12-9 UNIT 1 receives a fraction of that, set by the decimal interest printed on their check stub.
Lease record
| Operator | Endeavor Energy Resources L.P. |
|---|---|
| Field | Spraberry (Trend Area) |
| County | Martin County, Texas |
| RRC district | 08 |
| Lease number | 49245 |
| Wellbores | 13 |
| Reported production | 2,107,412 bbl |
| First reported | |
| Last reported | |
| Estimated royalty value | $20.4M |
Where COX 12-9 UNIT 1 sits
Source: Railroad Commission of Texas lease production records, complete through . Figures on this page were computed on .
Production figures are as reported to the Railroad Commission of Texas. The value shown is an estimate produced by fitting a decline curve to that reported history; it is not an offer or an appraisal. How this estimate is calculated.