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from 1939 to 1967. The Chateaugay mine was one of the deepest commercial iron ore mines in the United States, with stopes as much as 3,500 feet (1,050 m) below the surface.

Decline, merger, and re-launch

Republic Steel remained prosperous until the 1970s, when rising foreign imports, labor costs, and other factors caused severe stress at Republic and throughout the steel industry in the U.S.

In 1984, Republic merged into the Jones and Laughlin Steel Company subsidiary

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