Historically, Canadian slate quarries are common to Quebec, Newfoundland, and the eastern part of Ontario. From the early 18th century onwards, numerous regional quarries have opened and sometimes prospered, with most eventually closing.
Today, Canadian slate is still quarried on the border of Maine and Canada in St.-Marc-du-Lac-Long where the company North Country Slate
operates. Established in the mid 1990's, North Country Slate produces North Country Black, a slate similar to Monson Slate (quarried in Maine); both are smooth and black in appearance. North Country Black can be seen on the B&O Railroad Museum
in Maryland (pictured), buildings throughout Cornell University
in New York, and St. Michael's Cathedral