Pawnee County Mineral Rights

I'm one of four daughters who inherited 80 acres of Mineral Rights in Pawnee County, Ks. At first someone from Chesapeake said they were interesting in leasing them. Then they said no, they would only be looking at their 'tier 1' locations and ours was considered tier 2.

We really want to sell our mineral rights as we don't live in Kansas.

Does anyone have an idea of what the average price per acre for these mineral rights could be?

Has anyone dealt with those companies that say 'we buy mineral rights' - are they on the up and up?

Thanks