In Québec, slate has been quarried south of the St. Lawrence River. The Appalachian Province includes several slate deposits of Cambrian, Ordovician and Devonian ages. Most of the production comes from the quarries of the Kingsbury (Estrie) and Saint-Marc-du-Lac-Long (Bas-Saint-Laurent) areas.
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Slate exploitation began soon after 1854 in Estrie. The production was intensive from 1903 to 1909. Then it slowed regularly and came to a complete stop in 1923. Production statistics have been registered in a fragmented way. The extracted material was almost entirely used to produce roofing slate.
In 1995, the slate production started again with the opening of the Glendyne quarry in Bas-Saint-Laurent. Since then, slate has regained popularity, mainly with European and American clients who appreciate its aesthetic value in their buildings.
To explore the Gouvernement du Québec website on this subject, please click here.