Four vessels of the class were ordered in September 1949, followed by a further 10 in 1951 to replace the Second World War-era minesweepers. The second group of new construction was a result of Canada's entry into the Korean War. Initially ascribed the classification MCA they changed to MCB in 1954. In 1954, six ships, Chaleur, Chignecto, Cowichan, Fundy, Miramichi, and Thunder were transferred to the French Navy under the Mutual Aid Agreement of NATO due to a shortage of the type in allied navies. Chignecto, Cowichan, Fundy and Thunder were transferred on 7 April at Halifax, Nova Scotia with Chaleur and Miramichi on 9 October. Their names were reused for later vessels of the class. In 1958, four more, Comox, Gaspé, Trinity and Ungava, were transferred to the Turkish Navy.
In an effort to free up funding in the early 1960s for other capital projects, the remaining ten were placed in reserve. Four more of the class, Resolute, Quinte, James Bay and Fortune were paid off in 1964 and sold to commercial interests. Fortune was renamed Greenpeace Two and was used in an attempt to stop nuclear testing in the Aleutian Islands in 1971. In 1972, the six that remained were re-designated small patrol escorts with the classification PFL. In 1979 they were designated training ships with the classification PB. By 1980, they were part of the West Coast Training Squadron and they served with Training Group Pacific in the 1990s. They were discarded in the late 1990s with the second Chignecto the last to be paid off on 19 December 1998. In Canadian service they were replaced first by Anticosti class until the new Kingston-class coastal defence vessels were ready.
Gardiner, Chumbley & Budzbon 1995, p. 49. - Gardiner, Robert; Chumbley, Stephen & Budzbon, Przemysław, eds. (1995). Conway's All the World's Fighting Ships 1947–1995. Annapolis, Maryland: Naval Institute Press. ISBN 1-55750-132-7.
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"Four Minesweepers, Gate Vessel Ordered". The Crowsnest. Vol. 1, no. 12. Ottawa: King's Printer. October 1949. p. 2.
Gardiner, Chumbley & Budzbon 1995, p. 49. - Gardiner, Robert; Chumbley, Stephen & Budzbon, Przemysław, eds. (1995). Conway's All the World's Fighting Ships 1947–1995. Annapolis, Maryland: Naval Institute Press. ISBN 1-55750-132-7.
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Gardiner, Chumbley & Budzbon 1995, p. 49. - Gardiner, Robert; Chumbley, Stephen & Budzbon, Przemysław, eds. (1995). Conway's All the World's Fighting Ships 1947–1995. Annapolis, Maryland: Naval Institute Press. ISBN 1-55750-132-7.
Gardiner, Chumbley & Budzbon 1995, p. 49. - Gardiner, Robert; Chumbley, Stephen & Budzbon, Przemysław, eds. (1995). Conway's All the World's Fighting Ships 1947–1995. Annapolis, Maryland: Naval Institute Press. ISBN 1-55750-132-7.
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"Four Minesweepers, Gate Vessel Ordered". The Crowsnest. Vol. 1, no. 12. Ottawa: King's Printer. October 1949. p. 2.
Gardiner, Chumbley & Budzbon 1995, p. 49. - Gardiner, Robert; Chumbley, Stephen & Budzbon, Przemysław, eds. (1995). Conway's All the World's Fighting Ships 1947–1995. Annapolis, Maryland: Naval Institute Press. ISBN 1-55750-132-7.
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Gimblett, p. 133
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"Ships Scattered Across the Globe". The Crowsnest. Vol. 6, no. 4. Ottawa: Queen's Printer. February 1954. p. 2.
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"Ladies of the Month". The Crowsnest. Vol. 6, no. 6. Ottawa: Queen's Printer. April 1954. p. 1.
"'Sweepers Turned Over to France". The Crowsnest. Vol. 6, no. 12. Ottawa: Queen's Printer. p. 2.
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"First Minesweeping Squadron". The Crowsnest. Vol. 12, no. 10. Ottawa: Queen's Printer. August 1960. p. 18.
"Joint Sweeping Exercise Held". The Crowsnest. Vol. 13, no. 2. Ottawa: Queen's Printer. December 1960. p. 3.
"Second Minesweeping Squadron". The Crowsnest. Vol. 13, no. 1. Ottawa: Queen's Printer. November 1960. p. 24.
"Eight Ships Will Tour Great Lakes". The Crowsnest. Vol. 13, no. 7. Ottawa: Queen's Printer. May 1961. pp. 2–3.
Gimblett 2009, p. 154. - Gimblett, Richard H., ed. (2009). The Naval Service of Canada 1910–2010: The Centennial Story. Toronto: Dundurn Press. ISBN 978-1-55488-470-4.
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Gardiner, Chumbley & Budzbon 1995, p. 49. - Gardiner, Robert; Chumbley, Stephen & Budzbon, Przemysław, eds. (1995). Conway's All the World's Fighting Ships 1947–1995. Annapolis, Maryland: Naval Institute Press. ISBN 1-55750-132-7.
Macpherson & Barrie 2002, p. 271. - Macpherson, Ken & Barrie, Ron (2002). Warships of Canada's Naval Forces 1910–2002 (3 ed.). St. Catharines, Ontario: Vanwell Publishing Ltd. ISBN 1-55125-072-1.
Milner 2010, p. 285. - Milner, Marc (2010). Canada's Navy: The First Century (Second ed.). Toronto: University of Toronto Press. ISBN 978-0-8020-9604-3.
Macpherson & Barrie 2002, p. 272. - Macpherson, Ken & Barrie, Ron (2002). Warships of Canada's Naval Forces 1910–2002 (3 ed.). St. Catharines, Ontario: Vanwell Publishing Ltd. ISBN 1-55125-072-1.
Gimblett 2009, p. 192. - Gimblett, Richard H., ed. (2009). The Naval Service of Canada 1910–2010: The Centennial Story. Toronto: Dundurn Press. ISBN 978-1-55488-470-4.
Gardiner, Chumbley & Budzbon 1995, p. 49. - Gardiner, Robert; Chumbley, Stephen & Budzbon, Przemysław, eds. (1995). Conway's All the World's Fighting Ships 1947–1995. Annapolis, Maryland: Naval Institute Press. ISBN 1-55750-132-7.
Gardiner, Chumbley & Budzbon 1995, p. 129. - Gardiner, Robert; Chumbley, Stephen & Budzbon, Przemysław, eds. (1995). Conway's All the World's Fighting Ships 1947–1995. Annapolis, Maryland: Naval Institute Press. ISBN 1-55750-132-7.
Milner 2010, p. 220. - Milner, Marc (2010). Canada's Navy: The First Century (Second ed.). Toronto: University of Toronto Press. ISBN 978-0-8020-9604-3.
Gardiner, Chumbley & Budzbon 1995, p. 129. - Gardiner, Robert; Chumbley, Stephen & Budzbon, Przemysław, eds. (1995). Conway's All the World's Fighting Ships 1947–1995. Annapolis, Maryland: Naval Institute Press. ISBN 1-55750-132-7.
Gardiner, Chumbley & Budzbon 1995, p. 129. - Gardiner, Robert; Chumbley, Stephen & Budzbon, Przemysław, eds. (1995). Conway's All the World's Fighting Ships 1947–1995. Annapolis, Maryland: Naval Institute Press. ISBN 1-55750-132-7.
Gardiner, Chumbley & Budzbon 1995, p. 49. - Gardiner, Robert; Chumbley, Stephen & Budzbon, Przemysław, eds. (1995). Conway's All the World's Fighting Ships 1947–1995. Annapolis, Maryland: Naval Institute Press. ISBN 1-55750-132-7.
Milner 2010, p. 220. - Milner, Marc (2010). Canada's Navy: The First Century (Second ed.). Toronto: University of Toronto Press. ISBN 978-0-8020-9604-3.