Miss. Code § 27-31-71
Whenever the term "oil, gas and other minerals" is used in Sections 27-31-71 through 27-31-87, the same shall include oil, gas petroleum, hydro-carbons, distillate, condensate, casinghead gas, other petroleum derivatives, sulphur and all other similar minerals of commercial value which are usually produced or mined by the drilling, boring or sinking of wells.
The terms "mineral acre" and "royalty acre" are each defined as the number of acres obtained by multiplying the aggregate acreage described in the instrument involved by the fractional interest leased or conveyed thereby.
The term "primary term" when used herein in connection with any instrument affected by Sections 27-31-71 through 27-31-87 shall mean the period of time that the estate created by such instrument shall endure under the terms thereof in the absence of production of oil, gas or other minerals in paying quantities, the carrying on of drilling or reworking operations for the production of such oil, gas or other minerals, force majeure or laws, rules or regulations (federal or state) preventing such drilling operations.
Miss. Code § 27-31-71