The Directors

The Directors

Director

The Directors
Tailor made solutions to suit every client’s requirements. The founding members (and executive directors) of Z* are Principal Mineral Resource Analysts with strong geological and mining backgrounds.

Their sound knowledge base has been supplemented with specialist post graduate qualifications in geostatistics. They are registered as professional scientists with the South African Council for Natural Scientific Professions (SACNSP) and are members of the Geological Society of South Africa and/or the Geostatistical Society of South Africa. Z* has collective experience that encompasses the evaluation of projects in North and South America, Africa, Asia and Australasia.

Gavin Brown

Gavin Brown

Director

Gavin Brown (Executive) completed a BSc Honours degree from the University of Natal, a management diploma from the University of Stellenbosch and is a graduate of the École Nationale Supérieure des Mines de Paris, France (CSFG in Advanced Geostatistics). Gavin’s initial experience was in placer gold estimation; he developed this knowledge further by applying geostatistical techniques to the evaluation of marine diamond placer deposits. More recently he has expanded his knowledge to include primary kimberlite deposits. Gavin is widely recognised as a leading geostatistician in the marine mining field and has presented several scientific papers on the subject. Gavin specialises in sample optimisation, grade tonnage estimation, simulation and risk analysis. Download the full CV

David Bush

David Bush

Director

David Bush (Executive) studied geology at the University of the Witwatersrand, completed an MSc in Mineral Exploration from Imperial College in London and graduated from the Ecole Nationale Supérieure des Mines de Paris, France, with a DEA in Advanced Geostatistics. A significant proportion of David's experience was with Anglo American, in gold and base metal deposits. He then moved to De Beers to specialize in primary kimberlite estimation, a field where he is now recognised as a world expert. David has unique skills in modeling diamond size frequency distributions, diamond revenue analysis and mineral resource to reserve conversion. Download the full CV

Sean Duggan

Sean Duggan

Director

Sean Duggan (Executive) holds a BSc in Geology, a BSc Hons in Geochemistry from the University of Stellenbosch and an MSc in Mining Engineering (Geostatistics) from the University of the Witwatersrand. Sean worked for Anglo American in base metal and gold exploration and then progressed to the De Beers Marine team responsible for developing the first deep water, diamond mine. Sean honed his mineral resource skills at Anglo American Minred and as Evaluation Manager at Namdeb. He has specialist expertise in the development of optimal sampling techniques, the design of sampling programmes, database management and design. Sean chaired the 4th World Conference on Sampling and Blending and was on the organising committee of Geosynthesis11. As a Z* Principal Analyst Sean continues to work on diamond placers but has also undertaken a number of base metal projects. Download the full CV

Andy Grills

Andy Grills

Director

Andy Grills (Executive) holds BSc Hons and PhD qualifications in Geology from the Queens University of Belfast, UK. In addition, Andy is a graduate of the École Nationale Supérieure des Mines de Paris, France (CSFG in Advanced Geostatistics). He has worked for Anglo American and De Beers managing mineral resource departments on active mines controlling service delivery to the production units and contiguous evaluation programmes. His experience in the mining environment has resulted in a practical and common sense approach to mineral resource estimation and sampling optimisation based on a high level of technical expertise. Andy developed a unique, semi-quantitative mineral resource classification scheme for De Beers and, as the chairman of the Mineral Resource Classification Committee has overseen the classification of all De Beers mineral assets in compliance with international reporting codes. Download the full CV