(a) When the Department is required to appraise or determine the fair market value of miscellaneous minerals by application of recognized appraisal techniques, the Department shall use one or more of the following approaches or a combination thereof:
(b) The Department shall consider whether the sales price includes the value of processing or transportation to market or both added after the mineral has passed beyond the point of valuation.
(c) Return on investment attributable to mining and processing may be determined by a direct cost ratio proportion of costs, the proportion of investment, or rates of return prevalent in the industry.
(d) The Department shall weigh the relative significance, applicability and appropriateness of the indicators of value derived from the approaches to value or methods outlined above, including comparison of value indicators for similar minerals which best approximates the value of the mineral being appraised or valued.
(e) The fair market value of a mineral shall not include direct and indirect costs attributable to processing or transportation to market.
011-6 Wyo. Code R. § 6-10