They are calling a lot of owners in the area. I get several calls a month from them on various properties. It’s actually Halsell Oil & Gas and they’ve executed quite a purchases in Martin County since the decline of oil and gas in March.
I always suggest that mineral owners get an appraisal before they sell, especially if the minerals have been producing. There are also ways to check historical production on the Railroad Commission viewer https://gis.rrc.texas.gov/GISViewer/.