Tiffany's original bill was the subject of a public hearing Oct. 24, about two months after the Trempealeau County Board approved a one-year moratorium on permitting new frac sand mines. Trempealeau County has the most mines and processing plants in the state — and south of Trempealeau County in the Crawford County town of Bridgeport, citizens have filed suit over the town’s decision to permit a 400-acre frac sand mine near the Lower Wisconsin River.