Donald; Since they say the first lease is valid, you don’t have to sign the “new” papers they have sent you. If you won’t seek a lawyer, you might seek business advice from a mineral manager; probably a lot cheaper. If you will do neither, I’d just let it lay and make them sweat. I think you had a good idea about a new lease with all the acres at the same (higher) price. I would tell them that you will not lease the remainder (greater portion as you say) to them, period, if you can’t lease all of it at the higher rate. They can’t make money off your acres if they are leased to someone else, at least, nothing like the kind of money they want to make. I think you need professional advice specific to your state’s laws. If you started right now, you could probably learn most of what you need to know in 6 months studying 8 hours a day. I think professional help would be easier. Good luck.