Minn. Stat. § 514.56: PRESERVATION AND ENFORCEMENT.

The liens provided for in sections 514.54 and 514.55 shall be preserved and enforced as in the case of labor liens, except that no demand for payment need be made before the lien statement is filed, and that the lien statement, in addition to the other facts required, shall specify under which of the sections the lien is claimed; and except that in no case need the same be filed for record elsewhere than with the commissioner of natural resources.