Canadian Stocks Plunge Amid Mining Sell-Off Triggered by Tariff Uncertainty

Canadian equities plunged on March 3, 2026, with the S&P/TSX Composite Index closing 3.4% lower, its worst single-day drop since January 2023. The decline was driven by a sharp selloff in mining stocks, as investor sentiment deteriorated over rising uncertainty surrounding proposed U.S. tariffs on critical minerals and steel imports. Key miners including Barrick Gold (GOLD.TO) and First Quantum Minerals (FQ.TO) saw shares fall 6.7% and 8.2%, respectively, contributing heavily to the broader market downturn. The sell-off extended beyond mining, impacting energy and defense stocks amid concerns about disrupted supply chains and potential escalation in trade tensions. Crude oil futures (CL=F) settled 4.1% lower at $72.30 per barrel, reflecting reduced demand expectations from global manufacturing slowdowns linked to trade policy shifts. Meanwhile, defense-related equities such as CAE Inc. (CAE.TO) declined 5.3% as investors reassessed defense spending growth amid geopolitical instability. The volatility surge was mirrored in market indicators: the CBOE Volatility Index (VIX) rose 22% to 29.8, signaling heightened fear in equity markets. The Toronto-based iShares S&P/TSX 60 Index ETF (XIU.TO) dropped 3.1% amid broad-based investor risk reduction, particularly in commodity-exporting sectors. The market reaction underscores growing sensitivity to global trade policy shifts, especially as Canada remains a major exporter of raw materials. Economic analysts warn that prolonged tariff uncertainty could dampen capital investment and weaken business confidence across resource-dependent industries.