Except as otherwise provided in this chapter, the taxable value of any energy mineral which has been sold is the sale price of such mineral less any rental or royalty payment belonging to the United States or the State of South Dakota or its political subdivisions and the taxable value of any severed and saved energy mineral which has not been sold is the market value of such mineral less any rental or royalty payment belonging to the United States or the State of South Dakota or its political subdivisions.
SDCL 10-39A-2