There is hereby imposed upon all coal severed for sale or for industrial purposes by coal mines within the state a tax of thirty-seven and one-half cents per ton of two thousand pounds [907.18 kilograms]. The severance tax is in lieu of any sales or use taxes imposed by law. Each coal mine owner or operator shall remit the tax for each month, within twenty-five days after the end of each month, to the tax commissioner on reports and forms as the tax commissioner deems necessary. For the purposes of this chapter, commercial leonardite is taxed in the same manner as coal.
N.D.C.C. § 57-61-01