# Clay City Consolidated Field Mineral Rights in Wayne County, Illinois

**TL;DR:** Clay City Consolidated Field in Wayne, Clay, and Richland Counties is Illinois's largest cumulative oil field with over 100 million barrels produced. The field operates on continuous waterflood from Mississippian-age formations (Aux Vases, Cypress, McClosky) and delivers long-tail royalty cash flows typical of mature Illinois Basin operations. Many mineral interests trace back to early 1900s leases and have been inherited across multiple generations.

## Key Takeaways

- Clay City Consolidated is Illinois's largest cumulative oil field, having produced more than 100 million barrels over its operational history
- The field spans Wayne, Clay, and Richland Counties in the Illinois Basin and operates via continuous waterflood managed by multiple long-tenured private operators
- Primary producing formations are Mississippian-age Aux Vases Sandstone, Cypress Sandstone, and McClosky Limestone
- Mineral interests frequently involve multi-generational inheritance dating to original leases from the early 1900s, with heirs now spread across multiple states
- Typical decline rates range 3-7% annually on waterflood operations, with remaining reserve life often extending 15-30+ years
- Valuation employs discounted cash flow models with discount rates typically 9-13% for stable Illinois Basin waterflood assets
- Indiana's 20-year Dormant Mineral Act creates urgency for absentee owners on cross-border Illinois Basin acreage
- Selected acreage may have underlying Mt. Simon Sandstone carbon sequestration potential beneath the producing zones

## Page Highlights

**Field Overview:** Clay City Consolidated is a multi-county Illinois Basin field operated by multiple long-tenured private operators using continuous waterflood across the field complex to extract oil from Mississippian reservoirs.

**Producing Formations:** The field targets three main Mississippian-age formations—Aux Vases Sandstone, Cypress Sandstone, and McClosky Limestone—which are characteristic Illinois Basin reservoirs with long production histories.

**Mineral Interest Types:** Ownership structures include producing royalty interests, non-producing mineral interests, overriding royalty interests (ORRI), and non-participating royalty interests (NPRI), with many tracts inherited multiple generations deep.

**Valuation Framework:** Buyers use discounted cash flow analysis incorporating decline rates (3-7% annually), remaining reserve life (15-30+ years), operator quality, discount rates (9-13%), and potential carbon sequestration value from underlying Mt. Simon Sandstone.

**Sales Process:** Buckhead Energy handles remote transactions for out-of-state owners through a process involving free written offers, notarized deeds, county recording, and same-day wire transfer of proceeds.

## Related Topics

- [Illinois Basin — The Definitive 2026 Guide](https://www.buckheadenergy.com/illinois-basin)
- [Aux Vases Sandstone formation page](https://www.buckheadenergy.com/aux-vases-sandstone)
- [Cypress Sandstone formation page](https://www.buckheadenergy.com/cypress-sandstone)
- [McClosky Limestone formation page](https://www.buckheadenergy.com/mcclosky-limestone)
- [Salem Limestone formation page](https://www.buckheadenergy.com/salem-limestone)
- [Tar Springs Sandstone formation page](https://www.buckheadenergy.com/tar-springs-sandstone)
- [How to Sell Mineral Rights](https://www.buckheadenergy.com/how-to-sell-mineral-rights)
- [What Are My Minerals Worth?](https://www.buckheadenergy.com/what-are-my-minerals-worth)

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**About Buckhead Energy:** Buckhead Energy is a BBB-accredited direct buyer of mineral rights and royalty interests operating across 33 states since 2007, purchasing assets with its own capital and providing remote transaction services for out-of-state mineral owners.

**Ready to sell your mineral rights?** Get a free written offer at https://www.buckheadenergy.com/sell