Speakers:  Matthew Nimmo and Andrew Millar, AMC Consultants

Abstract:  In the not-so-distant past, mine planning and scheduling, strategic optimisation, short term scheduling and ore control relied on average estimates of rock performance through the crushing and grinding circuit and the process plant. Geometallurgical modelling, adding comminution (rock hardness, Axb, BBMWi) and processing response (mass recovered, concentrate grade and metal recovery) to a geological block model, replaces average values with spatial estimates (the Good). Geometallurgy modelling also allows for spatial estimation of a value descriptor (NSR) and can be used for blending studies and assist with sampling to continuously improve the model. The success of the geometallurgy modelling study is dependent on the quality and distribution of the data. Any data biases can result in a model that is very inaccurate (the Bad). However, one of the biggest threats to a geometallurgy study is the people and their cognitive bias (the Ugly). This talk will explore the Good, the Bad and the Ugly in geometallurgy modelling.

Bios:  Matthew Nimmo has nearly 30 years of experience in the mining industry as a resource geologist and data scientist. He is experienced in all facets of data analysis and machine learning. He has worked for Newcrest Mining, Harmony Gold, WMC, Hatch, Golder and AMC and recently spent 2 years working in the BHP Mining Centre of Excellence supporting the Total Equipment Strategy (TES).  At AMC, Matthew is involved with Mineral Resource estimation and predictive Geometallurgy modelling and mining data analytics. He is proficient with mining software and R for data analysis, statistics, variography and modelling.
Andrew Millar is Principal Metallurgist at AMC Consultants. Andrew has over 19 years in the mining industry and is experienced in the mining project life cycle from discovery to operations. Andrew’s expertise includes designing and managing metallurgical testwork programs, process flowsheet design, geometallurgical studies, process engineering, project management, feasibility studies, plant operations and techno-economic modelling. Prior to AMC, Andrew worked for Core Resources, SKM and GRD Minproc in addition to the Mopani gold operation in South Africa, the Wilkie Creek coal operation, the Risdon zinc smelter and the Kestrel coal operation. Andrew is a Chartered Professional (Metallurgy) for the AusIMM and is RPEQ accredited.

About JKMRC Friday Seminars 2021

Welcome to the 2021 Series of the JKMRC Friday Seminars.  The list of presentations will aim to cover a range of topics related to the minerals sector from decision making in exploration, new mineral processing technologies, social licence to operate and mine closure.

The JKMRC Friday Seminars will be presented both in person, at the Indooroopilly Mine Site Lecture Theatre, and also as webinar.  Registration for the webinar is required and can be made via the registration link in each seminar overview.

A large number of past webinars can be accessed on the SMI website: https://smi.uq.edu.au/webinars

Previous seminars have been uploaded to YouTube via the following link: https://www.youtube.com/user/smiuq

The final seminar in the 2021 series will be held on Friday 22 October.

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