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Photo of Mr Douglas Collier
Mr Douglas Collier
Chemical EngineerBAppSc(Met) UNSW, MEngSc(ChemEng) Newcastle 1977. MMICA, MAusIMM (CP), MIMM, MAusCeramicSoc, CEng

Doug has specialised in mineral processing and the chemical processing of minerals (hydrometallurgy). After graduating in metallurgy from the University of NSW in 1972, he worked seven years with King Island Scheelite and its sister company Warman International. This time was spent in the mineral processing and hydrometallurgy of scheelite in both plant operation and technical support. He was involved in the test work (including piloting), design, commissioning and operation of a plant producing synthetic scheelite and molybdenum sulphide byproduct. During this period, Doug obtained a M.Eng.Sc.(Chemical Engineering) from the University of Newcastle. The thesis topic was on phase separation aids in solvent extraction.
In 1979 Doug moved to the United Kingdom where he worked with Murex, eventually as head of a small process development department working on the hydrometallurgy of W, Mo, Va and Cr. His activities involved technical support to the plant and process development in all aspects of processing ranging from final stages in mineral processing to chemicals and refractory metal production.
In 1982 Doug moved to Frankfurt, Germany where he worked with Lurgi in the process development laboratory on pilot plant studies on synthetic rutile production and on testwork and technical development in the treatment of complex sulphides and gold. On returning to Australia in 1985, Doug worked for five years with Australia Wide Industries (including Topalite Resources and Centaur Mining) on the production of mullite refractory and fluoride chemicals from topaz containing silexite and on the technical development of a few gold operations. This work included the design and operation of a mineral processing and ceramics processing pilot facility and supervision of testwork and some design aspects of newly developing gold operations including the Plutonic project in W.A.
After a couple of years as a private consultant in gold and base metal processing, Doug joined the Australian Nuclear Science and Technology Organisation (ANSTO) at Lucas Heights, Sydney, in 1993 as a senior technical officer. This has involved testwork, up to pilot scale, in support of the mining industry, where mineral processing and extractive metallurgy entails treatment of ores and intermediates containing radioactivity. Bench to pilot scale studies have been carried out for example for the Mt Weld rare earthýs project, the Kintyre uranium project and in support of the currently operating Olympic Dam and Ranger Uranium mines.

  • Extractive Metallurgy
Areas of Practice:
  • Flowsheet development and plant design
  • Process – Investigation and Testwork
Commodity Experience:
  • Industrial Minerals – Clay Minerals, Refractories, Abrasives
  • Sn-W-Ta-Nb Group
  • Uranium


Photo of Mr Stephen Gemell Expert Witness
Mr Stephen Gemell Expert Witness
Mining EngineerGemell Mining EngineersMining Engineer

Steve Gemell has more than 35 years’ experience in the mining industry, having worked throughout Australasia and in Africa, North and South America, Asia, Eastern and Western Europe. He has been Principal of Gemell Mining Engineers, an independent multi-discipline consultancy, since its formation in Kalgoorlie in 1984.
The consultancy specialises in mineral property assessment, valuations, technical audits, strategic studies, operational troubleshooting, hard rock mine planning and design, feasibility studies and expert witness.
His experience includes operational management in underground and open pit mining in positions from shift boss to resident manager, which has also involved the supervision of CIP/CIL, flotation and alluvial plants. He has subsequently held executive and non executive directorships, including the positions of CEO and Chairman, in listed mining companies. He has additionally held an appointment as Visiting Fellow at the University of New South Wales and is currently a member of the VALMIN Committee.
He is currently non-executive chairman of Golden Cross Resources Limited, and non-executive director of Argent Minerals Limited, Eastern Iron Limited, Indochine Mining Limited and UCL Resources Limited.
He is a fellow of the AusIMM, a Chartered Professional (Mining) and a Member of the American Institute of Mining, Metallurgical and Petroleum Engineers.

  • BE(Min)(Hons) Sydney 1976
  • Mine Mgr Cert (NSW, WA, South Africa)
  • Project Valuation & Technical Audits
  • Strategic Management
    Mine Planning & Design
Areas of Practice:
  • Independent expert valuations
  • Mine – Appraisal
  • Mine planning and design
  • Strategic planning including company acquisition
  • Technical audit and due diligence studies
Commodity Experience:
  • Base Metals
  • Diamonds
  • Gold, Silver
  • Industrial Minerals – Clay Minerals, Refractories, Abrasives
  • Iron Ore, Manganese, Chrome
  • Sn-W-Ta-Nb Group
Regional Experience:
  • Australia – Western Australia
  • Indonesia
  • Philippines


Photo of Mr John Lea Expert Witness
Mr John Lea Expert Witness

John Lea is a Chartered Professional Geologist whose 24 years of work experience is predominantly in the planning and management of exploration programmes for coal and groundwater, data acquisition and their evaluation. His professional associations with Groundsearch Australia’s current clients provides him with practical experience by working directly with internationally-recognised, technical experts in drilling, geophysical logging, coal analysis, groundwater, geotechnical, environmental and human impact investigations. His wide-ranging experience and continuing professional contacts are invaluable in his current role.

  • BSc (Hons) Newcastle,
  • MMICA, MAusIMM(CP), Mine Mgr Permit (NSW)
  • Coal Geology
  • Baseline Groundwater Investigations
    Downhole Geophysics
Areas of Practice:
  • Baseline Studies
  • Geophysics
Commodity Experience:
  • Industrial Minerals – Clay Minerals, Refractories, Abrasives
Regional Experience:
  • India


Photo of Mr Christopher Prowse Expert Witness
Mr Christopher Prowse Expert Witness
GeologistC K Prowse & AssociatesGeologist

Chris has over 20 years’ experience in the mineral and extractive industries. He caters for all facets of exploration programs, evaluation and project management, particularly in gold and base metal projects, sand and hardrock construction materials operations including dimension stone.
His work is conducted predominantly in Victoria, South Australia, New South Wales and Western Australia. Recent briefs undertaken include regional project management, quarry development and rehabilitation planning, reserve/resource estimation, major exploration programs, prospect assessments and project generation.
Chris is also a member of the Institute of Quarrying Australia and an Associate Member of the Securities Institute of Australia.

  • BAppSc RMIT 1981, DipAFI SIA 1993
  • Non-Metallics Exploration
  • (Construction Materials)
    Base & Precious Metal Exploration
Areas of Practice:
  • Exploration – Planning and Management
  • Exploration – Strategy
  • Geochemistry
  • Literature surveys and data compilation
  • Photogeology and remote sensing
  • Quarrying
  • Resource / Reserve estimation (inc. geostatistics)
Commodity Experience:
  • Base Metals
  • Gold, Silver
  • Industrial Minerals – Clay Minerals, Refractories, Abrasives
Regional Experience:
  • Australia – South Australia
  • Australia – Victoria
  • Australia – Western Australia


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