I have seen many posts on here lately that concern me slightly so I just wanted to post a comment.  Please make sure you understand the difference between selling your mineral rights and leasing them. 

Selling your mineral rights permanently separating your mineral rights from your surface rights.  You will receive the one time payment for that sale and that is it.  This sale is forever, unless by some chance the mineral rights are abandoned in the future and the owner at that time files the correct paperwork and is able to rejoin them.  If you have property that you want to pass on to your children and grandchildren this is something you may not want to do. This can affect property value too if your heirs one day want to sell the land. You are selling all your mineral rights oil, gas, coal, or some future discovery.

Leasing your mineral rights does potentially have some endpoint and you can specify specific minerals, oil and gas but not coal, coal but not oil and gas, and even different layers can be leased to different companies by lease language.  Also the lease language can specify an endpoint five years plus option for second five years if no production then lease ends.  Also if production does occur but later ceases then lease ends.  You are paid for production.  Your land both surface rights and mineral rights remain joined and pass on to your heirs even though minerals may still be encumbered by the lease the payment would go on to heirs as well.  And the rights go back to heirs when lease ends.

PLEASE, PLEASE do not sign any paperwork from anybody without taking the time and the roughly $200 for one hour of an attorney's time to look over said paperwork before you sign it.  There are several posts on here talking about payment for mineral rights and it is not at all clear if the company is leasing or buying.  They use the term bonus which is not accurate when selling minerals.  That is not a bonus.  It is payment for permanent ownership of your mineral rights.  It is a one time payment and you do not get royalties. The new owner gets them.   You will receive letters from various companies even if you have a lease asking to purchase your mineral rights.  If you are already leased you can not lease again so any conversation you are having is one about buying your mineral rights.  Just be cautious and make sure you understand fully what you are signing.