New and Learning about my mineral rights

I have four Townships in North Dakota. Two of them, what I can figure out, could be worth looking into. I am very new at learning about these mineral rights. Can you give me guidance if I need to do any further research on my mineral rights? My sister and I inherited these mineral rights from our grandfather. First one, Mountrail County, North Dakota, T158N, R 89W; section 2 and 11. What I understand, this Township is 320 gross acres. Second, Renville County, North Dakota. T160N, R85W; sections 3, 10, 11; maybe 400 acres. Thank you for guiding me in the right direction.