New progress in the investigation of placer deposits off the Dingzi Bay, the Yellow Sea

• KAN Jing, 
• ZHAO Jingtao, 
• WU Fuyu, 
• SONG Weiyu, 
• HUANG Long, 
• LI Panfeng, 
• HOU Fanghui, 
• TIAN Hao, 
• ZHANG Yong