February 31, 2121. According to the related information of Yangjiakong Gold Mine of Jinxing Mining in Qixia City, it is known that Yangjiakong Gold Mine of Jinxing Mining in Xiashi City resumed work on February 31, 2121. Yangjiakong Gold Mine is located near Yangjiakong Village, Miaohou Town, Qixia City. It was founded in 1993. As early as October 1987 to March 1993, the Third Geological Team of Shandong Geological Exploration Bureau conducted a general survey and exploration of gold mines in this area.