煤炭开采板块12月9日跌1.35%，新大洲A领跌，主力资金净流出7.94亿元

Group 1 - The coal mining sector experienced a decline of 1.35% compared to the previous trading day, with Xinda Zhou A leading the drop [1] - The Shanghai Composite Index closed at 3909.52, down 0.37%, while the Shenzhen Component Index closed at 13277.36, down 0.39% [1] Group 2 - The coal mining sector saw a net outflow of 794 million yuan from main funds, while retail investors contributed a net inflow of 574 million yuan and speculative funds saw a net inflow of 220 million yuan [2]