Gainers & Losers: Dynacons, Hindustan Zinc Soar; Refex, HCC Plunge

• Hindustan Copper shares surged over 7% due to a sharp rise in copper prices.
• Larsen & Toubro shares rose after Goldman Sachs upgraded its rating to 'buy' with a 34% higher target price.
• Hindustan Zinc shares jumped over 7% as silver prices crossed ₹2 lakh per kg, benefiting the pure-play silver company.
• Refex Industries shares plummeted 20% to a lower circuit after the Income Tax department uncovered over ₹1000 crore in tax evasion.
• HCC shares fell over 7% to a one-year low as its ₹1000 crore rights issue opened at ₹12.5.

Why It Matters: Specific company news and market factors drive significant stock price changes.