Selling mineral interests

I just posted a question on another discussion that probably should have been posted here, so I will post this again.

We received an offer from Anthem INC to purchase 2 of our mineral interests in Martin County. The offer was much higher than previous offers. I am wondering if there have been others of the higher offers and how does one decide to sell or continue the royalties?

Nan

need legal descriptions to give a valid answer

I need to add to the description that it is all of section 4 All of Section Four (4), Block 37, T1S,T&P Rwy.Co./J.S. Day Survey, Abstract 642, Martin County, Texas

I have mineral rights in Martin County, Labor 1, League 259, Borden County School Land, I have received several offers, there are two wells presently producing from the Sprayberry. What would be a reasonable offer?