Kathy Roberts v. Unimin Corporation

ARNOLD, Circuit Judge.

*1016 For the past century, the Williamson family has leased out a plot of Arkansas land for silica mining. The current lease, signed in 1961, provides for a term of years until 2007 and continuing "as long thereafter as" certain activities occur on the property. In 2015, Kathy Roberts and Karen McShane (both née Williamson), the present lessors, sought a declaratory judgment against Unimin Corporation, the present lessee, that the lease created a tenancy at will. The lessors claimed further that the lease was unconscionable and that Unimin had unjustly enriched itself by…