In any year in which at least 1,000 tons of iron ore concentrate is not produced from any 40-acre tract or governmental lot containing semitaconite, a tax may be assessed upon the semitaconite therein at the local tax rate prevailing in the taxing district and spread against the net tax capacity of the semitaconite; such net tax capacity shall not exceed the greater of:
Minn. Stat. § 298.37
Ex1959 c 81 s 4; 1988 c 719 art 5 s 84; 1989 c 329 art 13 s 20; 1Sp1989 c 1 art 2 s 11