A. For the privilege of processing natural resources, there is imposed on any processor of natural resources in New Mexico an excise tax at the following rates on the taxable value of the natural resources:
(1) all natural resources except timber, potash and molybdenum, three-fourths of one percent;
(2) timber, three-eighths of one percent;
(3) potash, one-eighth of one percent; and
(4) molybdenum, one-eighth of one percent.
B. The tax imposed by this section shall be referred to as the "processors tax".