Production and value of mineral rights

I inherited 3 mineral acres in Mountrail County, ND. Township 158, Range 94 West, Section 14: West half of west half. I also inherited acres in McKenzie County, ND too. East 1/2 pf Section 24, Township 152N, Range 102 West and Lots 1,2,3 and 4 Section 19, Township 152N, Range 101 West. I had been getting maybe $300 a year more or less for many years. It seemed it wasn’t worth it since it almost cost that to file taxes on it every year since it had been put in a trust. I decided to sell them and before the sale got finalized I received a check for over $3000. Had never gotten that much before. The company paid me $2500 for the acres. It’s to late now but I’m wondering if I got taken advantage of? Also how much production is going on in that area now? Thank you.