Sending letters and cold calling seems to have a decent success rate when buying and leasing minerals.
But one problem plaguing individuals (myself included) who want to buy mineral rights or royalties directly from the owner is the high cost of subscription services or hiring of landmen to actually find the owners.
One company that I've found that offers more budget friendly options is TexasMineralOwners.com . They basically just compile public records and well information to give you a contact name, number and their appraised tax roll value but it is great for calling and sending letters!
I hope I am allowed to post this just thought it was interesting information for those individual mineral buyers out there or those looking to get into the business.