Cost Basis for Mineral Rights Acquired in 1987

For tax purposes, I need to determine the cost basis for Mineral Rights I acquired in 1987. I've had trouble finding the value of comparable properties because online documents don't go that far back.

The Reeves County tax office suggested that a landsman might be able to perform this research for me.

If other members have a recommendation for someone I should talk to, please PM me.

Alternately, I know there are several landsmen active in this forum. If that research is something that you can help with, well, I could use the help.



Was there production in 1987? That would be online in 1987.