However, if the oil is being extracted by use of a secondary recovery method, the total assessed value of all interests in the oil equals one-half (1/2) the assessed value computed under the formula prescribed in this subsection. The appropriate township assessor (if any), or the county assessor if there is no township assessor for the township, shall, in the manner prescribed by the department of local government finance, apportion the total assessed value of all interests in the oil among the owners of those interests.
IC 6-1.1-4-12.6