La. R.S. 31:195

If a usufruct of land does not include mineral rights, the naked owner of the land has all of the rights in minerals that he would have if the land were not subject to the usufruct. The rights may not be exercised in coal or lignite which is to be produced through surface mining techniques without first obtaining the consent of the usufructuary. If the usufructuary is entitled to the benefits provided in Article 190 and 191, the rights of the landowner are subject thereto.