(Yicai Global) Aug. 31 -- China's mainland stock markets relinquished morning gains in the afternoon session of the month's last day, dragged down by the Shenzhen tech board. The three major benchmarks were mixed this month, but main boards performed better on the whole.

The Shanghai Composite Index closed 0.24 percent lower at 3,395.68. The Shenzhen Component Index stood at 13,758.23, down 0.67 percent, and the ChiNext Price Index, which tracks growth enterprises listed in Shenzhen, flopped 1.07 percent to 2,728.31.

Nonferrous metal developers and clothing firms led the markets, including Tibet Huayu Mining [SHA:601020] up 10 percent to CNY13.72 (USD2) and Zhejiang-based apparel maker Youngor Group [SHA:600177], which also hit the daily limit to stop trading at CNY7.69.

Shares in the business services, insurance and logistics sectors were among the worst performers.

The Shanghai Composite Index has climbed 2.59 percent this month, continuing July’s bull run. The Shenzhen Component Index inched up 0.88 percent, while the ChiNext Price Index flipped and dropped 2.4 percent.

Editor: Ben Armour