Hindustan Zinc, Vedanta to NALCO: Why are metal stocks falling today?

Hindustan Zinc fell as much as 4.7% to its day's low of ₹592.05. NALCO declined 3.8% to ₹369, while Vedanta dropped 3.7% to ₹276.50. Hindalco shed 3% to ₹1,005.30. Hind Copper also declined 2.5% to ₹520.20 during the session.