Feeds:
Posts
Comments

Posts Tagged ‘tailings failure’

A little bit more on the failure of that tailings facility in Brazil from some-one on the ground:

The accident was in a very small mine close to Belo. It was an old tailings dam that was not  supposed to be in operation anymore. But they decide to pile dried tailings on top of it. I don’t have technical details about the failure but I guess it is very similar to a previous one I took you to see. At the moment of the failure, equipment was working at the same point. That’s the reason for the deaths. It is going to take some time for us to get the conclusions about the real cause of the accident. But, as soon as I get some more information I will let you know.

Thanks to this fellow for letting us know.

Here is another comment from someone in Brazil:

The Minas Gerais dam failure is worst because of dead people (3), which means that there is environmental process and also criminal. The problem I see from the two failures is that we still don´t know the causes. In Canada the cause seems to be overtopping or seepage thru the embankment (high pore pressures or piping); in Brazil it seems to have occurred static liquefaction, and the triggering cause possibly excavation of the outer slopes. But we haven´t seen any word about the causes. It is just my guess. In Canada the pictures we saw doesn´t show a good appearance of the dykes. It resembles coarse and loose material, not prepared to have any contact with water. In Brazil it was an old tailings dam, upstream construction, that was being used as a platform for the operation of settling ponds (we call it here “baias”), where the coarse settles and are removed by shovels and transported to piles, and the fines have the same destiny, but need more time to drain and do dry.

Read Full Post »

tumblr_mw2b1umvrZ1qm86t3o1_500[1]

Today we have read all we can find on the failure of the Mt Polley tailings facility.  It is all distressing.  And mostly misleading.  Here are a few clear thoughts on the topic. (more…)

Read Full Post »

tumblr_ma0rnrWVVt1ro76g2o1_500[2]

Risk resilience is a term that I heard for the first time today.  The people who used the term assure me that it is not new, just not recognized in mining for its power. There was a conference last year in South Africa on risk resilience in mining.  There is a successful consultant on the topic in Australia. (more…)

Read Full Post »

There is no such thing as a typical mining investor.  That much was brought home to me today.  (more…)

Read Full Post »

Mike Davies is the pre-eminent tailings engineer of present times.  He and his team in Vancouver can solve any tailings challenge your mine may face.  He and his team at AMEC are the best of the best.  They have not paid me to say this; I write, as always, on the basis of personal opinion & conviction. (more…)

Read Full Post »

This morning a pleasant-voiced lady from CBC TV called me and asked my opinion about the recent failure of a tailings impoundment in Hungary and its impact on towns, villages, and the Marcal river.   I am not sure why she called me—maybe this blog and the opinions I express.  She asked simple, direct questions and we hung up.  A short while later, most breathlessly, she phoned again and asked if I would be prepared to be interviewed for a piece the CBC is running tonight on the topic.  I told her that I am old and ugly and thus not a good TV candidate.  She has the training, and she turned on the charm—who am I to resist the charms of a smart woman?  So I walked down a few blocks to the CBC and there they interviewed me.  (more…)

Read Full Post »

Follow

Get every new post delivered to your Inbox.

Join 562 other followers