Whereas the Owners of certain Lands and Hereditaments within the said Manor or Liberty ofEyam,usually called “ancient Freeholds,” claim to be exempt in respect of the said Lands and Hereditaments from all Mineral Customs heretofore in force, and from the Jurisdiction of all Barmote Courts heretofore in Existence, and of any Steward thereof: until it shall be found by Law that the said Lands and Hereditaments are subject to such Customs and to such Jurisdiction, nothing in this Act or the Schedule hereto contained shall extend or be construed to extend any Mineral Law or Laws, Custom or Customs, to the said Lands and Hereditaments, or any of them, nor to give any Authority to search for Mines or Veins of Lead Ore, in, under, or upon any of the said Lands or Hereditaments, nor to extend the Jurisdiction of any Great or Small Barmote Court, or the Steward thereof, to the said Lands or Hereditaments, or any of them, nor otherwise to affect any Right or Interest whatsoever of any of the Owners of the said Lands and Hereditaments: Provided always, that until it shall be found by Law that the said Lands and Hereditaments are subject to such Customs and such Jurisdiction, the Authority of the Barmote Courts and Steward (if any), and all Customs (if any) to which such Lands and Hereditaments are now subject, shall remain in full force.