Dr Zheng has been a Director since January 7, 2010. He was the chief executive officer of Creat Group from 1992 to 2002 and has been the chairman since 2002. Creat Group is the substantial interest holder of CRHL, a mining resources company listed on AIM. He has also been a non-executive chairman of CRHL since March 16, 2008 and has been the managing director and chief executive officer of CRHL since June 24, 2010. Dr Zheng has been a director of Beijing Keruicheng Mining Investment Co Ltd and Beijing Keruicheng Jinchuan Mining Investment Co Ltd since 2006 and 2007 respectively.