As well as having various liners and membranes Heap leach pads have a Leak Detection and recovery system.
This is the full technical report for Victoria Gold Eagle Mine. A good way to come up to speed on IRGS. It doesn't need a tailings pond since everything is processed via Heap Leach.
https://vgcx.com/site/assets/files/6480/jds-vit-eagle-gold-ni-43-101-fs-report-20191206.pdf
This is the technical report for Fort Knox. See section 18 for Tailings Management.
http://s2.q4cdn.com/496390694/files/doc_downloads/2018/Fort-Knox-June-2018-Technical-Report.pdf
Ann: Nova 4.7Moz Resource Upgrade Presentation, page-31
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