MDN has written plenty about Pennsylvania's HB 1684--the Guaranteed Minimum Royalty Act (see these MDN articles). In essence, some companies (cough *Chesapeake Energy* cough) have gotten creative with deducting post-production costs from royalty checks. According to the PA Guaranteed Minimum Royalty Act of 1979, royalty owners (landowners) must receive no less than 1/8, or 12.5%,