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Mr. Guo Zhonglin
Chief Technical Officer
Mr. Guo Zhonglin, aged 54, has been the technical advisor of the lead-zinc-silver mine of the Shizishan Mine in Yinjiang County since 2010 and was appointed as the Chief Technical Officer of the Group in 2011. Since his appointment as Chief Technical Officer, Mr. Guo has been responsible for the technical guidance, technical supervision and technical management in respect of the mining and safety of each mine owned by the Group. Mr. Guo graduated from Kunming University of Science and Technology (昆明理工大學) with a master degree in mining engineering in 1986. He has over 31 years of working experience in mining and the safety of mines. Prior to joining the Group, he was a professor in the Faculty of Land Resource Engineering in Kunming University of Science and Technology from 1986 to 2000, and had served in various positions such as the head of teaching research office, head of department and chairman of the Labour Union. In that period of time he was responsible for the teaching and administration of two programmes, namely Mining Engineering and Safety Engineering, as well as the guiding of postgraduates and served as a lecturer of both major professional courses for undergraduates and professional courses for postgraduates. Between 2000 and 2009, he was a professor of the Research Institute of Energy Conservation and Safety Technology of Mines at Kunming University of Science and Technology where he engaged in technical research of the mining of metal and nonmetal mines and safety engineering, and had completed over 20 research programmes. Meanwhile, he was the chief project engineer for Ruixinyuan Mining Company Limited in Binchuan County, Dali Prefecture, Yunnan Province in respect of the iron-gold mine at its Baixiang plant where he was responsible for the guidance and management of underground mining production and technology.  
Mr. Lei Dejun
Chief Operating Officer
Mr. Lei Dejun, aged 39, has been the Chief Operating Officer of the Group since April 2012 and was appointed as an executive Director from12 June 2017. Mr. Lei is responsible for the overall production and development of polymetallic projects and the monitoring of the development of Dakuangshan project and he participated in parts of management of the Shizishan Mine project since September 2013. Mr. Lei was appointed as the president of DehongYinrun Mining Group Company Limited, a subsidiary of the Company, subsequently in April 2015 where he was fully responsible for daily operation and management of each of the Group’s mining entities. Mr. Lei graduated with an associate degree from Kunming Metallurgy College in 1998. Mr. Lei has about 19 years of experience in the production management and operation of mines. Prior to joining the Group, Mr. Lei worked as a technician, deputy director and director of the production department and supervising engineer of the factory at HuizeLeadZinc Mine and Qujing Company of Yunnan Chihong Zinc & Germanium Co., Ltd. (雲南馳宏鋅鍺股份有限公司) from July 1998 to March 2012 where he was responsible for factory production, cost management, human resources, technique and equipment management. During that tenure, he led a number of mining and metallurgical projects and obtained several domestic invention patents and utility model patents.
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