Bonus rates in the Falls County area

I am a new mineral rights owner and I have recently been approached to sign a lease. The land is located in Falls County, Tx. I own 1/2 the rights to 110 acres. I'm interested in finding out what the going rate for the bonus is there. I was offered $50 an acre with a 1/6 royalty. Being a novice, I'm looking for any information or resources available to me. Any information would be greatly appreciated.