Mineral ownership interests question

I have some mineral rights that I inheireted, most of the properties on the list specify a 1/20 interest or 1/160 interest but some properties do not list the interest. Can somebody explain this to me?

Thanks, Milo

Normally it means ALL or 100% in the tract but many times it is unknown so the interest percentage or fraction is left out and not listed.

Thank you Tim.

Tim Metz said:

Normally it means ALL or 100% in the tract but many times it is unknown so the interest percentage or fraction is left out and not listed.

Your welcome Milo, sorry I couldn't have been more helpful, it's so much nicer to know exactly what one owns.