The deeds will have been filed in the county records where the minerals are located. Many counties are on-line, either through the county website or through various services. You can search the records for your name and pay to download, generally around $1 per page. Your records should have a legal description including the county and state. You can do this yourself or a landman can help you with this search. Make a list of the various tracts in each county and state. Then you can match them to the deeds and see if the deeds include tracts which are not on your leases or other documents. If you post the various counties and states, someone can direct you to a site to use to search.
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