Jefferson county ohio rights

I found gas and oil leases that my grandmother bought in 1964 how do I learn about these. I need to know if they are worth anything or not. I would appreciate any help I can get.

I moved you over to the Jefferson Co, Ohio topic so local folks can help.

You need to learn how to use the Ohio oil and gas database to see if there is any production on the tracts. ODNR Map Viewer

Do you have leases or do you have mineral rights tracts? Those words mean different things. You may have found a lease, but the minerals are behind it. The type of lease is important.