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Dam Monitoring Effects

Dam monitoring effect is a case history. A client acquired a mining properties portfolio. It included inactive dams at closed mines. Some of these structures were relatively well documented, while others were not. As a result, the client was facing important decisions, one of them being the effort to enhance the knowledge on the structures. The question the client asked was: “What happens to a particular dam if the level of knowledge we have on an inactive dam goes from…

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Tailings dams design and experience

Lately several tailings dam failures rocked the mining world. Despite the relative high frequency of these events we have heard engineers qualify the failures as “one in a million”, “extremely rare” or even “black swans”. Today we want to discuss a few concepts on tailings dams design and experience. In particular, we will focus on some disconcerting qualifiers like the ones we just cited above. For example, given the experience of tailings dams catastrophic failures  resulting from combinations of various…

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Light on Tailings dams failures

The Church of England Pensions Board and the Council of Ethics of the Swedish National Pension Funds published some recently collected numbers shedding some light on Tailings dams failures.   How many active dams in the world did we assume earlier? In the literature we oftentimes see the number 3500 to characterize the total tailings dam inventory in the world. We used that number in both the following papers: Oboni, C., Oboni F., Factual and Foreseeable Reliability of Tailings Dams and…

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