Thetford Mines, city (1991 pop. 17,273), S Que., Canada, NE of Sherbrooke and S of Quebec. The city, developed after the discovery (1876) of large asbestos deposits, is located in one of the world's largest asbestos-producing regions. Chromium and feldspar are also mined.
"Thetford Mines." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (September 23, 2018). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/thetford-mines
"Thetford Mines." The Columbia Encyclopedia, 6th ed.. . Retrieved September 23, 2018 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/thetford-mines