Gold Bond Canada Ltd., formerly National Gypsum Canada Ltd., operates the world's largest open pit gypsum mine, located in Milford, Nova Scotia, which opened in 1954 and has produced over 165 million tons of gypsum. 

The gypsum is shipped via rail to a loading facility in Dartmouth, Nova Scotia, where it is loaded and shipped to Gold Bond's US plants, primarily on the US Eastern Seaboard, for manufacturing into various types of wallboard.