Royalty rates shall be established annually by the Tax Commissioner after review of both recorded and unrecorded, willing seller-willing buyer natural resource property leases that have occurred in the State of West Virginia during at least the five (5) calendar years prior to the appraisal date, and through inspection of other appropriate information. This review shall place a greater emphasis on information from leases transacted during the most recent years. For those natural resources involved in few or no recorded lease agreements, the Tax Commissioner shall derive a royalty rate through surveys conducted by his or her staff, data provided by the other pertinent State agencies, and other appropriate information as may be made available from the specific natural resource producers. The Tax Commissioner shall maintain this summary report of royalty rates and file the results in the State Register on or before July 1st of each year; shall accept written public comment on the tentative values until August 1st of each year; and, shall file final royalty rates in the State Register on or before September 1st of each year. From this data, the Tax Commissioner shall select the royalty rates that best typify transactions. In order to convert percentage royalty rates into specific value per ton rates, the Tax Commissioner shall, if necessary, conduct a review of the specific natural resource selling prices in West Virginia by requesting the selling prices from private purchasers, the State Department of Highways, and the West Virginia Geological and Economic Survey, as well as other informative sources available, and select specific selling price rates based on prices best typifying activity in each appraisal year. The selected selling prices per ton when multiplied by the percentage royalty rate shall result in a royalty price per ton.
W. Va. Code R. § 110-1K-4