http://law.justia.com/cases/arkansas/supreme-court/2012/11-902.html
Staggs et al v. Union Pacific Railroad Company
The Staggs case against Union Pacific (Successor Railroad to the old Missouir Pacific) was settled in favor of the railroad and XTO and Heartland Exploration. This case has now been upheld by the state Supreme Court. Unfortunately, for the Staggs, the issue was clouded by our muddled law and those pesky tax issues that keep plaguing the issue.
Part of the issue was that they cited a 1941 decision that found a "generic" reservation of mineral rights included only substances generally known to exist at the time and place of the reservation. The reservation was made in 1934. Since the area was known to have gas much earlier, I didn't see how that issue was going to pass muster. Carey Croneis did a report in the 1920's citing places where gas was found in the region.
Nevertheless many issues involving ownership of mineral rights remain unresolved.
This is an interesting link to check out...
http://lawreview.law.uark.edu/wp-content/uploads/2012/03/MossFinal.pdf