Mineral Value Grady Co. 30 8N 6W

My cousin and I own minerals in Grady 30 8N 6W

It is a hot spot. We have been getting unsolicited purchase offers by mail and phone. We would like to sell some and hold most to hedge our bets on an upcoming well.

Can anyone help me determine the value and suggest how to market them?

I have been offered $5000 an acre in 7n6w. Not selling!