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Photo of Mr David Choy Expert Witness
Mr David Choy Expert Witness
GeologistWedderburn Mining Pty LtdGeologist

David Choy is an independent consulting geologist, with over 25 years experience in the minerals industry. He has a Bachelor of Science (Hons) degree (1970) from the University of Malaya and a Master of Science degree (1995) ftom Monash University, Melbourne.
He worked for Conzinc Riotinto Malaysia Limited from 1970-1982, firstly as an exploration geologist for base metals and tin, and then as a mine planning engineer. From 1982 to 1985, he was employed by CRA Exploration Pty. Limited to work as a Senior Geologist on deep lead gold exploration in Victoria. From 1985-1990, specializing on gold and mineral exploration, he was employed
by a number of mining companies in Australia. He helped acquire the zeolite project for Mount Gipps Limited which has subsequently become Zeolite Australia.
He was a founding director of Mount Wellington Gold Pty. Limited which is engaged in gold and base-metal exploration on a major greenstone belt in Victoria. From 1991-1996, he was a Director of Mount Wellington Gold Pty. Limited.
And from 1996 – present working as a consulting geologist on gold and base-metal exploration in Australia, Southeast Asia and China.

  • Gold, Base Metals, Tin and Heavy Minerals
  • Exploration and Evaluation
Areas of Practice:
  • Exploration – Planning and Management
  • Exploration – Strategy
  • Exploration – Property Appraisal
  • Literature surveys and data compilation
Commodity Experience:
  • Base Metals
  • Gold, Silver
  • Sn-W-Ta-Nb Group
  • Zeolite
Regional Experience:
  • Australia – Victoria
  • China
  • Indonesia
  • S E Asia (Malaysia, Thailand, Vietnam, Myanmar)
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 Damian Connelly Expert Witness
Mr Damian Connelly Expert Witness

Principal Metallurgist working as a Consultant. Extensive experience gained in all commodities and extractive processes including gold, copper, lead zinc, nickel, uranium and iron ore, titaniu, and vanadium. Specialist in comminution, gravity, flotation, hydrometallurgy, CIP/CIL and Merril Crowe gold & refractory gold metallurgy, heap leaching, bacterial leaching, solvent extraction and electrowinning.

Damian has worked on many major projects incuding flowsheet design, process improvements, cost reduction, conceptual project development, trouble shooting, engineering tenders and financial audits. Career employment with BHAS, Zinc Corp, Peko Wallsend, Bougainville Copper, Hamersley Iron, Roxby Mgt Services, KMA Pty Ltd, Harbour Lights Mining, Aztec Mining, METS Pty Ltd over some 35 years.

Experience has been gained in plant operations, feasibility studies, detailed design, construction and commissioning and all unit operations. A wealth of hands-on operating experience as a foreman, plant metallurgist, plant superintendent, chief metallurgist and project manager which has provided a solid base to mix with engineering and construction management. Damian has also run courses in Metallurgical Accounting and Mineral Processing for industry participants.

The last 21 years have been spent working as a Principal Consulting Metallurgist for Mineral Engineering Technical Service Pty Ltd for Mining, Banking and Engineering Companies both within Australasia and overseas.

View Damian’s CV
  • Mineral Processing
  • Feasibility Studies – Design
  • Due Diligence
  • Project Management
Areas of Practice:
  • Management services
  • Metallurgy and mineral processing
  • Operational management
  • Technical audit and due diligence studies
  • Training and Education
Commodity Experience:
  • Base Metals
  • Gold, Silver
  • Industrial Minerals – Other
  • Iron Ore, Manganese, Chrome
  • Nickel and Cobalt
  • Rare Earths
  • Sn-W-Ta-Nb Group
  • Uranium
  • Vanadium
Regional Experience:
  • Australia – All States
  • Brazil
  • China
  • New Zealand
  • PNG
  • Russia, CIS


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