On July 1, Liu Yun, deputy secretary of the Weifang Municipal Party Committee and mayor, and Song Junqi, secretary general of the Weifang Municipal Government, and other leaders visited Weifang Yucheng New Materials Co., Ltd., a subsidiary of Shandong Useen Holding Group, to investigate green mine construction and safety production. Song Weiwei, secretary of the Qingzhou Municipal Party Committee, Guo Xingping, member of the Standing Committee of the Municipal Party Committee and executive deputy mayor, Yao Zhongxiu, chairman of Shandong Useen Holding Group, and other leaders accompanied the event.