Mineral Interests and Fee Property

I just joined this forum. My Dad acquired some interests many years ago and these interests have been passed down to my sister and myself. The interests are in the Henryetta area in Okmulgee Co (tract 11N), the NE Okmulgee area in Okmulgee Co, and the W. Okmulgee area in Okmulgee Co. I have M/R No. and Fee No. on all but I don't know what that references.

How do I find out if there is anything drilling or leasing in these areas as it pertains to these interests? I have the plats on each. And in reference to the Fee Property, has this been lost due to non payment of taxes? I am unfamiliar with this.

I appreciate any help anyone can give me.