St. Lawrence Cement has achieved remarkable growth through selective acquisitions, product development and innovative processes. Over the past 50 years, we played a significant role in most of the large economic development projects in Québec and Ontario, and, since the 70s, in the northeast United States.

1951– Incorporation for the purchase of land.

1953-1954– Holcim Ltd began its operations in North America with the construction of its first cement plant in Villeneuve (now Beauport), near Québec City. Operations began in December 1954.

1955-1956– In order to supply the Toronto area, a second cement plant was built in Clarkson (now Mississauga). Operations began in October 1956.

1956– Completion of an initial public offering of shares in Canada to finance part of the construction of the Mississauga plant.

1957-59– Cement distribution terminals were built in LaSalle, Québec, as well as in Thunder Bay, London, Ottawa, and Sudbury, Ontario.

1961– Expansion in the Toronto-Hamilton area with the acquisition of Associated Quarries and Construction Ltd. and its subsidiaries, the largest being Dual Mixed Concrete & Materials Ltd., Dufferin Construction Company Ltd., and Hagersville Quarries Ltd.

1962– The Milton stone quarry in Ontario, one of the largest in North America, began operations to supply the Toronto and Western Ontario markets.

1964-66– Acquisition of several concrete manufacturers in Québec (De-Mix Ltée, Billet Ltée, and Québec Ready-Mix).

1970– Establishment of an American subsidiary, Wyandotte Cement Corp., to manage U.S. acquisitions in Buffalo (Lehigh Portland Cement) and in the Detroit area (BASF-Wyandotte).

1973– Acquisition of Lévis Ready-Mix (Québec), Carrières Normont (Laval), McGowan Mobile Mix (Toronto), M.R. Good Holdings and its subsidiary H. Boehmers (Kitchener).

1976– Acquisition of Ciment Indépendant inc., in Joliette, the second largest cement producer in Québec. It also included a construction services division and concrete plants in Montréal.

1977– Acquisition of the Universal Atlas assets in Greenport, New York, site of the proposed cement plant.

1984– First major acquisition in the U.S.: a cement plant in Catskill, New York, and cement distribution centres in four states.

1985– Acquisition of a cement plant in Hagerstown, Maryland, and of a cement distribution centre in Baltimore. Acquisition of Custom Concrete Limited in the Toronto area.

1989– Acquisition of Peninsula Ready-Mix and Supplies and of four concrete plants known as the Regional Group, in Ontario.

1991– Acquisition in Québec of Les Bétonnières Valleyfield and Béton Ormstown.

1992– Acquisition of two concrete plants in St-Eustache and Montréal.

1996– Acquisition of a fly ash company in the U.S.

1997– St. Lawrence Cement tripled its reserves of aggregates in the Toronto area with the acquisition of Gormley Aggregates.

1998– Beginning of the permitting process for the construction of a cement plant in Greenport, New York. Acquisition in Ontario of ready-mix concrete facilities in Simcoe, Tillsonburg, Aylmer and London.

1999– Inauguration of a new slag granulator in Sault Ste. Marie, Ontario. Acquisition in Ontario of two ready-mix plants in the Malton and Niagara regions.

2000– Acquisition of cement distribution facilities in Newfoundland. Investment in Varennes, Québec, for the construction of a crushing facility.

2001– Start-up of a GranCem® facility in Camden, New Jersey. Acquisition of a quarry, sand and gravel reserves, asphalt plants and a construction company in Ontario.

2003– Acquisition of the assets of an aggregates business in Ontario.

2004– Acquisition of an aggregates business in southwestern Ontario.