Evaluation and mapping of corrosion in a western USA underground metal mine — year one preliminary results

Authors: Chambers, AJ; Sunderman, CB; Benton, DJ; Brennan, JT; Orr, DT

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DOI https://doi.org/10.36487/ACG_rep/1704_54_Chambers

Cite As:
Chambers, AJ, Sunderman, CB, Benton, DJ, Brennan, JT & Orr, DT 2017, 'Evaluation and mapping of corrosion in a western USA underground metal mine — year one preliminary results', in J Wesseloo (ed.), Deep Mining 2017: Proceedings of the Eighth International Conference on Deep and High Stress Mining, Australian Centre for Geomechanics, Perth, pp. 785-798, https://doi.org/10.36487/ACG_rep/1704_54_Chambers

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Abstract:
Corrosion of ground support can lead to falls of ground, posing a significant risk to miner safety. To address this problem, the Spokane Mining Research Division of the National Institute for Occupational Safety and Health is investigating ground support corrosion at the Greens Creek mine, located near Juneau, Alaska, United States of America. Field and laboratory studies include surveys of weld-wire mesh corrosion, rock mass conductivity measurements, and sample analyses using a scanning electron microscope, energy dispersive spectrometry, and Fourier transform infrared spectrometry. Current field studies demonstrate a correlation of rock mass conductivity to the degree of weld-wire mesh corrosion and the relationship of ground conductivity surveys to support corrosion potential. Laboratory analyses of mine samples identify the presence of sulphate, which is a determinant for sulphate reducing bacteria activity. Identification of sulphate reducing bacteria (SRB) would provide evidence for microbial influenced corrosion in this mine. Ongoing research is evaluating methods of SRB inhibition. These results provide engineers with a means to map corrosion potential of the rock mass, and identify a number of paths for design of focused mitigation efforts for problem areas.

Keywords: corrosion, sulphate reducing bacteria (SRB), microbial influenced corrosion (MIC), resistivity, safety

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