BEIJING -- China's stocks ended mixed on Tuesday, after the country's Central Huijin Investment firm purchased shares in four major state-owned banks on Monday. The benchmark Shanghai Composite Index gained 0.16 percent, or 3.73 points, to close at 2,348.52 points.

The Shenzhen Component Index dropped 1.04 percent, or 105.27 points, to close at 10,065.47.

Combined turnover climbed to 112.43 billion yuan ($17.71 billion) from 72.3 billion yuan the previous trading day.

Gainers outnumbered losers 479 to 397 in Shanghai, while losers outnumbered gainers 658 to 642 in Shenzhen.

Central Huijin Investment Ltd, an arm of China's sovereign wealth fund, said on Monday that it had bought shares in four major state-owned banks on the secondary market.

Driven by the good news, key indexes of both bourses opened more than 2 percent higher compared with the previous trading day, but later were dragged down by investors' negative sentiment.

Bank shares were among the largest gainers. China Construction Bank gained 2.49 percent to close at 4.52 yuan per share, while Bank of China rose 2.09 percent to 2.93 yuan.

Coal-related stocks plummeted after China's State Council, or the cabinet, announced on Monday that it will tax all resource products starting Nov 1.

Yangquan Coal Industry Company tumbled 9.25 percent to 21.79 yuan per share, while China Shenhua Energy dropped 4.2 percent to close at 24.21 yuan.