The Town Board shall be authorized to issue Town Board mining special use permits. No person shall do, conduct, perform, or engage in mining, or operate a mine within the Town, except within a Mining District and except pursuant to a Town Board mining special use permit issued by the Town Board in accordance with the procedures set forth in this subsection; provided, however, that it shall be permissible to remove minerals from any parcel of land on a casual basis for noncommercial use without establishing a Mining District or obtaining a Town Board mining special use permit therefor, but in no event shall more than 1,000 tons or 750 cubic yards, whichever is less, of minerals be removed from any parcel of land during any twelve-month period. Any mine site for which the New York State Department of Environmental Conservation has issued a valid mining permit prior to the effective date of this section and for which the Town Planning Board has approved the site plan prior to the effective date of this section may continue to be operated (subject to the terms and conditions of said mining permit and site plan approval) without the issuance of a Town Board mining special use permit hereunder, as long as said mine site is not expanded or enlarged beyond the area, size or scope set forth in said mining permit and site plan approval; any expansion or enlargement of said mine site beyond the area, size or scope set forth in said mining permit and site plan approval shall require the operator thereof to apply for, and obtain, a Town Board mining special use permit pursuant to this section of the Zoning Local Law.