美股盘前，白银概念股走强，泛美白银涨4.6%

Group 1 - Silver-related stocks showed strength in pre-market trading on February 19, with Pan American Silver rising by 4.6% [1] - Hecla Mining increased by 1.9% in the same trading session [1] - First Majestic Silver saw a rise of 1.3% [1]