美股银矿股，集体下跌

Group 1 - The Dow Jones Industrial Average decreased by 321.01 points, or 0.65%, while the Nasdaq and S&P 500 indices increased by 121.17 points (0.51%) and 14.87 points (0.21%) respectively [1] - The major U.S. technology stocks showed a positive trend, with the Nasdaq 100 futures up by 150.00 points, or 0.58% [1] - Silver mining stocks experienced a collective decline, with Hecla Mining down by 2.1%, Endeavour Silver and Coeur Mining down by 1.5%, and Silvercorp Metals down by 1.4% [1] Group 2 - Health insurance companies saw a drop in stock prices, with UnitedHealth down nearly 17%, Humana down over 16%, and Cigna down nearly 10% [2] - Corning Inc. shares rose over 7% after Meta announced it would pay up to $6 billion for procurement [2] - General Motors shares increased by over 5%, with an expected adjusted earnings per share of $11 to $13 by 2026 [2]