Mineral-interests/rights are a real-property "estate":
Owner's right to certain or all of the sub-surface minerals:
crude-oil, gold, natural-gas, ...
Specifically, Owner's Rights-to:
1. Use reasonably-necessary-surface to access minerals,
2. Convey all/any of these interests/rights,
3. Receive bonus-consideration,
4. Receive delay-rentals,
5. Receive royalties.