
Overview
Background
Mayra is a geometallurgy specialist with extensive experience leading geometallurgical studies and developing predictive models for greenfield and brownfield mining projects. She has a strong background in process mineralogy, the design and management of metallurgical testwork programs, and process design, supporting process optimisation and project development.
Her experience includes working as a Senior Metallurgist at Transmin Metallurgical Consultants in Lima, Peru. She recently completed her PhD in Mineral Processing at The University of Queensland, where her research focused on understanding the effect of mineral textures on flotation performance. She is currently a researcher with the Flotation Chemistry Group at the Julius Kruttschnitt Mineral Research Centre (JKMRC), working on ore characterisation, process mineralogy, metallurgical testing, and flotation chemistry
Availability
- Dr Mayra Jefferson is:
- Available for supervision
Qualifications
- Bachelor of Chemical Engineering, Universidad Nacional Mayor de San Marcos
- Masters (Coursework) of Extractive Metallurgy, Curtin University of Technology
- Doctor of Philosophy of Mineral Processing, The University of Queensland
Research impacts
My research investigates which mineral characteristics, such as texture, composition, and associations, most influence how effectively minerals can be separated and recovered through flotation. I aim to understand not just what affects flotation, but also how and why these mineralogical factors impact processing efficiency.
This work supports more efficient mineral extraction by linking measurable ore characteristics (including mineral texture, grain size, and surface chemistry) with flotation performance. These insights contribute to better geometallurgical models, improved resource predictability, and reduced operational risk in both greenfield and brownfield mining projects.
By combining advanced mineral characterisation techniques with metallurgical testing and process modelling, my research promotes more sustainable and cost-effective mineral processing. This is especially important as the industry faces increasing ore complexity, declining grades, and greater environmental and water-use pressures.
Ultimately, this research helps unlock value from difficult-to-process ores and supports decision-making across the value chain, from exploration and resource evaluation to plant design and optimisation.
Works
Search Professor Mayra Jefferson’s works on UQ eSpace
2025
Conference Publication
A Multi-Technique Process Mineralogy Approach to Understanding Pyrite Flotation Behaviour
Jefferson, Mayra, Yenial-Arslan, Unzile, Kostryzhev, Andrew, Parbhakar-Fox, Anita and Forbes, Elizaveta (2025). A Multi-Technique Process Mineralogy Approach to Understanding Pyrite Flotation Behaviour. Procemin Geomet 2025, Santiago, Chile, 6-8 August 2025. Santiago, Chile: Gecamin.
2025
Other Outputs
Worsley bauxite characterization
Jefferson, Mayra and Forbes, Elizaveta (2025). Worsley bauxite characterization. Brisbane, QLD, Australia: The University of Queensland.
2025
Other Outputs
Relationship of pyrite textures and composition on flotation performance at Mount Isa copper deposit
Jefferson Montoya, Mayra Thalia (2025). Relationship of pyrite textures and composition on flotation performance at Mount Isa copper deposit. PhD Thesis, Sustainable Minerals Institute, The University of Queensland. doi: 10.14264/79bd6d6
2024
Journal Article
Impact of pyrite textures prevalence on flotation performance in Mount Isa copper orebodies
Jefferson Montoya, M., Jones, T.R, Curtis-Morar, C., Parbhakar-Fox, A., Forbes, G. and Forbes, E. (2024). Impact of pyrite textures prevalence on flotation performance in Mount Isa copper orebodies. Mineral Processing and Extractive Metallurgy Review, 46 (4), 502-516. doi: 10.1080/08827508.2024.2349204
2024
Conference Publication
Effect of Pyrite Textures and Composition on Flotation Performance
Jefferson Montoya, Mayra, Yenial Arslan, Unzile, Evans, Cathy, Parbhakar-Fox, Anita, O'Donnell, Roxanne, Curtis Morar, Catherine and Forbes, Liza (2024). Effect of Pyrite Textures and Composition on Flotation Performance. Australasian Colloid and Interface Symposium, Terrigal, NSW Australia, 4 - 7 February 2024.
2024
Journal Article
Solving the mystery of natural pyrite flotation – A mineralogy-based approach
Forbes, E., Jefferson, M., Yenial-Arslan, U., Curtis-Morar, C. and O'Donnell, R. (2024). Solving the mystery of natural pyrite flotation – A mineralogy-based approach. Minerals Engineering, 207 108544, 1-12. doi: 10.1016/j.mineng.2023.108544
2023
Conference Publication
An object-based image recognition approach methodology for pyrite texture quantification in flotation performance studies
Jefferson, Mayra, Forbes, Gordon, Brown, Elliot, Curtis-Morar, Catherine, Parbhakar-Fox, Anita and Elizaveta Forbes (2023). An object-based image recognition approach methodology for pyrite texture quantification in flotation performance studies. Procemin-GEOMET, Santiago, Chile, 4-6 October 2023.
2023
Journal Article
Effect of pyrite textures and composition on flotation performance: a review
Jefferson, Mayra, Yenial-Arslan, Unzile, Evans, Catherine, Curtis-Morar, Catherine, O'Donnell, Roxanne, Parbhakar-Fox, Anita and Forbes, Elizaveta (2023). Effect of pyrite textures and composition on flotation performance: a review. Minerals Engineering, 201 108234, 108234. doi: 10.1016/j.mineng.2023.108234
2023
Conference Publication
Effect of Pyrite Textures and Composition on Flotation Performance
Jefferson Montoya, Mayra, Yenial Arslan, Unzile, Evans, Cathy, Prabhakar-Fox, Anita, O’Donnell, Roxanne, Curtis-Morar, Catherine and Forbes, Liza (2023). Effect of Pyrite Textures and Composition on Flotation Performance. Flotation 2023 • V International Conference on Minerals Flotation, Lima, Peru, 6 - 8 Sep 2023.
2023
Conference Publication
Textural influence on flotation behaviour of Mount Isa copper deposit
Yenial-Arslan, U., Jefferson, M., Wang, J., Curtis-Morar, C., O’Donnell, R. and Forbes, E. (2023). Textural influence on flotation behaviour of Mount Isa copper deposit. World Mining Congress, Brisbane, QLD, Australia, 26-29 June 2023.
2023
Journal Article
Pathway to prediction of pyrite floatability from copper ore geological domain data
Yenial-Arslan, Unzile, Jefferson, Mayra, Curtis-Morar, Catherine and Forbes, Elizaveta (2023). Pathway to prediction of pyrite floatability from copper ore geological domain data. Minerals, 13 (6) 801, 1-24. doi: 10.3390/min13060801
2023
Conference Publication
Solving the mystery of pyrite flotation: a mineralogy-based approach
Forbes, Liza, Yenial Arslan, Unzile, Jefferson Montoya, Mayra, O'Donnel, Roxanne and Curtis, Catherine (2023). Solving the mystery of pyrite flotation: a mineralogy-based approach. International Flotation Symposium in Honour of Prof Graeme Jameson, Newcastle, NSW, Australia, 13-14 July 2023.
2021
Conference Publication
Simulation of HydroFloat® performance in flotation circuits for early stage project evaluation
La Torre, L., Jefferson, M., Johnston, A., Concha, J. and Wasmund, E. (2021). Simulation of HydroFloat® performance in flotation circuits for early stage project evaluation. Flotation 21, Online, 8-12 November 2021.
2020
Conference Publication
A roadmap to geometallurgical modeling at The Cerro Lindo VMS Deposit
Jefferson, Mayra, Johnston, Adam, Matias, Cesar and Davila, Nilo (2020). A roadmap to geometallurgical modeling at The Cerro Lindo VMS Deposit. Procemin - Geomet 2020, Online, 23-27 November 2020. Chile: Gecamin.
2017
Conference Publication
Minimum criteria for reporting representativity of metallurgical samples
Johnston, Adam and Jefferson, Mayra (2017). Minimum criteria for reporting representativity of metallurgical samples. Procemin - Geomet 2017, Santiago, Chile, 4-6 October 2017. Santiago, Chile: Gecamin.
2013
Conference Publication
Mediciónes de dispersión de gas en celdas de flotación industrial
Jefferson, M., Fuentes, C. and Johnston, A. (2013). Mediciónes de dispersión de gas en celdas de flotación industrial. II Encuentro Internacional Metalurgia Perú 2013, Lima, Peru, 1-3 November 2013. Lima, Peru: Intermet.
Funding
Current funding
Supervision
Availability
- Dr Mayra Jefferson is:
- Available for supervision
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Media
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