China stocks posted modest gains on Thursday as higher commodity prices and infrastructure spending continued to boost shares of firms in the materials sector,Reuters said. The blue-chip CSI300 index rose 0.6 percent to 3,440.93 points, while the Shanghai Composite Index added 0.5 percent to 3,229.62. Most sectors rose, led by a 1.6 percent gain in materials shares, taking its gain to 10 percent so far this year. China's high-profile "One Belt, One Road" initiative to link markets from Asia to Europe and its accelerated infrastructure investment at home have boosted demand for building-related resources and raw materials, including steel, cement and base metals, said He Jing, an analyst at Northeast Securities. An index tracking China's major non-ferrous metals added as much as 2.8 percent to hit a fresh two-month high, while an index tracking coal miners gained 2.2 percent.