The Fluorspar Mines of Newfoundland: Their History and the Epidemic of Radiation Lung Cancer by John R. Martin

In the early 1930s a rich deposit of fluorspar, a mineral used in the production of aluminum, steel, non-stick coatings, and fire retardant clothing, was discovered on the southern tip of Newfoundland. Two mines were established and by mid-century were major employers in St Lawrence. In the 1950s physician Cyril Walsh noticed a marked increase in cases of cancer in the miners. By the late 1960s nearly twenty percent of St Lawrence households had lost a family member to lung cancer.