(1) The tax authorized by this part shall be levied pursuant to this part in any county upon the adoption of a resolution by a two-thirds vote of the county legislative body of such county. The presiding officer of the county legislative body shall certify a copy of the resolution to the secretary of state and the commissioner of revenue.
(2) In addition, no tax shall be collected by the department of revenue pursuant to such county legislative action until the first day of a month occurring at least thirty (30) days after the receipt of a certified copy of such action by the department.
(3) Any county legislative body that has by private act enacted prior to June 5, 1984, levied a tax on the severance of sand, gravel, sandstone, chert or limestone may continue such tax at a rate not to exceed the rate established in this part, and such private act shall remain in force and effect in such county for all other purposes; provided, that any adjustment required by this part, in the rate effective in such county, shall take effect on the first day of the month following June 5, 1985.