Tracking decarbonisation in the mining sector

  • H. Immink University of Stellenbosch http://orcid.org/0000-0002-7070-8624
  • R.T. Louw Promethium Carbon
  • A.C. Brent Department of Industrial Engineering, Stellenbosch UniversityandSustainable Energy Systems, Engineering and Computer Science, Victoria University of Wellington
Keywords: gold mining, iron ore mining, emissions forecasting, target setting, climate change mitigation, greenhouse gas reporting

Abstract

Greenhouse gas (GHG) emissions increase as mining companies transport ore over increased distances in opencast operations or extract ore from deeper levels in underground operations. The rising costs of energy sources and enhanced awareness of the impacts of GHG emissions support energy- and emission-reduction initiatives. This paper evaluates the metrics used in GHG emissions projections and target-setting over a ten-year period from 2005, linked to the South African Energy Efficiency Accord. The GHG inventories of a gold- and iron ore-mining company, together with the implemented energy saving projects, were analysed to evaluate progress against targets. A broad target value, defined as a percentage reduction of GHG emissions over time, was found to be problematic in monitoring performance over time. A direct link between emissions and output metrics was not found, due to external factors, such as the impact of changes in the grid emission factor, acquisitions and divestments, and internal factors, including changes in ore grade or mining depth. Using a metric linked to the activity within the operations, such as total tonnes mined, is, therefore, more appropriate for mining companies than production output. A methodological tool, using both the inventory and the savings from implemented mitigation initiatives, is proposed to improve GHG emissions projections, establishing a counterfactual baseline, and to support target setting. Decarbonisation of the mining industry would require careful review of the metrics to project and set GHG reduction targets.

Author Biography

H. Immink, University of Stellenbosch

Centre for Renewable and Sustainable Energy Studies

Department of Industrial Engineering

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Published
2018-03-22
Citation Export
Immink, H., Louw, R., & Brent, A. (2018). Tracking decarbonisation in the mining sector. Journal of Energy in Southern Africa, 29(1), 14-23. Retrieved from https://journals.assaf.org.za/jesa/article/view/3437