Unimin Corp Highway 51 & 16 Poynette, WI 53955 Phone : (608) 635-2423 Business Category Sand & Gravel (Wholesale) Concrete Aggregates (Wholesale) Unimin Corporation Us Highway 51 & State Road 16 Portage, WI 53901 Phone : (608) 635-2423 Business Category Sand & Gravel (Wholesale) Concrete Aggregates (Wholesale)