Are they legitimate?

My family owns several parcels of mineral interests in eastern Oklahoma County, Sections 21, 22 and 27, T13N, R1W, I.M. We recently received an offer to lease the majority of our interests. I cannot find any other current activity in the area. Can anyone confirm the legitimacy of United Land Company, Edmond, OK, and advise on continuing the negotiations with regard to bonus and royalty interest percentage?

they are legit