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Minerals 2018, 8(5), 193; https://doi.org/10.3390/min8050193

Towards Representative Metallurgical Sampling and Gold Recovery Testwork Programmes

1
Minerals Engineering Research Group, Camborne School of Mines, University of Exeter, Penryn, Cornwall TR10 9FE, UK
2
Department of Mining and Metallurgical Engineering, Western Australian School of Mines, Curtin University, Bentley, WA 6102, Australia
3
Department of Mineral and Energy Economics, Western Australian School of Mines, Curtin University, Murray Street, Perth, WA 6000, Australia
4
Department of Mineral Resources Engineering, School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
*
Author to whom correspondence should be addressed.
Received: 5 March 2018 / Revised: 17 April 2018 / Accepted: 19 April 2018 / Published: 4 May 2018
(This article belongs to the Special Issue Geometallurgy)
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Abstract

When developing a process flowsheet, the risks in achieving positive financial outcomes are minimised by ensuring representative metallurgical samples and high quality testwork. The quality and type of samples used are as important as the testwork itself. The key characteristic required of any set of samples is that they represent a given domain and quantify its variability. There are those who think that stating a sample(s) is representative makes it representative without justification. There is a need to consider both (1) in-situ and (2) testwork sub-sample representativity. Early ore/waste characterisation and domain definition are required, so that sampling and testwork protocols can be designed to suit the style of mineralisation in question. The Theory of Sampling (TOS) provides an insight into the causes and magnitude of errors that may occur during the sampling of particulate materials (e.g., broken rock) and is wholly applicable to metallurgical sampling. Quality assurance/quality control (QAQC) is critical throughout all programmes. Metallurgical sampling and testwork should be fully integrated into geometallurgical studies. Traditional metallurgical testwork is critical for plant design and is an inherent part of geometallurgy. In a geometallurgical study, multiple spatially distributed small-scale tests are used as proxies for process parameters. These will be validated against traditional testwork results. This paper focusses on sampling and testwork for gold recovery determination. It aims to provide the reader with the background to move towards the design, implementation and reporting of representative and fit-for-purpose sampling and testwork programmes. While the paper does not intend to provide a definitive commentary, it critically assesses the hard-rock sampling methods used and their optimal collection and preparation. The need for representative sampling and quality testwork to avoid financial and intangible losses is emphasised. View Full-Text
Keywords: metallurgical sampling; metallurgical testwork; geometallurgy; gold mineralisation; representative sampling; Theory of Sampling; quality assurance/quality control metallurgical sampling; metallurgical testwork; geometallurgy; gold mineralisation; representative sampling; Theory of Sampling; quality assurance/quality control
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Dominy, S.C.; O’Connor, L.; Glass, H.J.; Purevgerel, S.; Xie, Y. Towards Representative Metallurgical Sampling and Gold Recovery Testwork Programmes. Minerals 2018, 8, 193.

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