La. Stat. tit. 31 § 203
A mineral right is susceptible of mortgage to the same extent and with the same effect, and subject to the same provisions of rank, inscription, reinscription, extinguishment, transfer, and enforcement as is prescribed by law for mortgages of immovables under Article 3286 of the Civil Code. Unless expressly excluded by the terms of the act creating it, a mortgage entered into prior to the time Chapter 9 of the Louisiana Commercial Laws becomes effective attaches to the interest of the mortgagor in all corporeal movables placed on the land, or on a unit including all or part of the land, and dedicated to the use and exploitation of the mineral right. The interest of the mortgagor in movables placed on a unit including all or part of the land affected by the mineral right is subject to such a mortgage only to the extent of the interest in the unit attributable to the mineral right mortgaged. Movables only temporarily or transiently on the premises for purposes such as drilling, reworking, servicing, or testing a well or mine located thereon shall not be deemed dedicated to the use or exploitation of the mineral right. The movables shall remain movable and be subject to separate mortgage or encumbrance under Chapter 9 of the Louisiana Commercial Laws as permitted by law with the rank and priority so provided.
La. R.S. § 31:203
SEE ACTS 1989, NO. 137, §§20 AND 21.