Kwan Wong is a post-graduate of the University of Melbourne in primary Metallurgy and mineral processing. During his is a post-graduate of the University of Melbourne in primary Metallurgy and mineral processing. During his career of over 40 years as a processing metallurgist, Kwan has worked in CSIRO, Mt Gunson Mines and Amdel. In 1989 he was the Managing Director of Optimet Laboratories which he established in partnership with two other metallurgists. Following the acquisition of Optimet Laboratories by AMMTEC Ltd, Kwan is presently working as a consulting metallurgist. Kwan has extensive experience in flotation treatment of complex sulphide ores and with research, development and plant implementation of Controlled Potential Sulphidisation (CPS) flotation of mixed, oxidised, oxide and supergene base metal sulphide ore. Kwan's consulting activities over the past years have included review/evaluation of flotation testwork and plant performance, plant commissioning and trouble-shooting, and metallurgist/operator training. He has also acted as a specialist speaker in flotation workshops and as an expert witness in legal proceedings. In more recent years Kwan's interest and experience in flotation treatment has extended to non-metallic and industrial minerals due to increased activities in this area of mineral processing in Australia and overseas.

 Email: kwanwong@internode.on.net

Ray Doherty, Senior Metallurgist, graduated with a Bachelor of Metallurgical Engineering degree from the University of Queensland in 1968 and began his career with the Electrolytic Zinc Company in Rosebery, Tasmania. After working in the positions of Research Metallurgist and Plant Metallurgist he undertook a Master of Engineering Science degree at the University of Queensland and returned to Rosebery in 1976 as Senior Research Metallurgist. During his time in Rosebery he was involved in two major expansions of the copper-lead-zinc flotation concentrator, the introduction of on-steam analysis and the development of a high grade copper circuit. From 1980 to 1989 Ray was employed by Amdel in Adelaide as a Research Officer working mainly on laboratory and pilot scale sulphide flotation projects. Ray also provided on-site consulting services during this time, including one year at the Elura mine during commissioning. In 1989 Ray established Optimet Laboratories in partnership with Kwan Wong, and has since worked as a Senior Metallurgist / Consultant on numerous projects, mostly concerned with sulphide flotation. Over his career, Ray has worked on almost all of the complex copper-lead-zinc and lead-zinc ore bodies developed in Australia in the past 38 years.

 Email: raydoherty@optimetlab.com.au