Section 20 Copy of all mining grants to be filed.

A true copy of all leases, grants, and licences made after the commencement of this Act, giving to the grantee the right to work mineral property within the said stannaries, and also of all assignments and contracts for the sale of such leases, grants, and licences, shall be filed by the lessee, grantee, licensee, assignee, or purchaser thereof at the said office of the said registrar within fourteen days from the execution thereof; and in default of such filing thereof, no such lease, grant, licence, assignment, or contract shall until filed be enforceable at law or in equity.