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Archive for the ‘safety’ Category

Foto: Peter Öhman

The translation above the pictures reads:

It doesn’t matter that it is Sweden’s most modern mine, built according to environmental laws, which the Government says is the world’s strongest. In addition, Northlands mine outside Pajala is a financial flop, it is now also an ecological disaster.
One million cubic metres of water with toxic heavy metals such as nickel, cadmium, lead, copper, and more flows straight out of the wrecked mine dam to Muonioälven and later the Torne River, which is classified as a national river.

At this link you will find four photos that appear to show the breach of the perimeter embankment or dike and spillage of tailings into the surrounding countryside.  Above is one of them.

The reports make little mention of the causes of failure.  Although the four pictures appear to show more than one breach.  A posting on Facebook dates the failure as 19 July 2014.

Please comment if you know more.

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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.

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Just got news of the failure of a tailings facility in Brazil.  I can find no English versions of the news.  There are many reports in Portuguese, and you can get them translated via Google.  They provide little information about the engineering causes or consequences, other than that at least three and possibly as many as ten are dead. (more…)

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The oft-asked question I get is this: how do you prevent a recurrence of the Mt Polley failure?  I have touched on some aspects of the answer in previous postings.  But let me, here, state my opinion succinctly.  Sure to be controversial, but this is what I truly believe is necessary to prevent a recurrence of Mt Polley, at least here in BC.   At least the following should be done for every tailings facility (in BC?): (more…)

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The five pictures in this posting, were taken (by me) at the Getty Center in Los Angeles.  This place is surely a testament to genius and attention to detail.

Yesterday I was asked if Canadian guidelines are adequate to deal with the Mt Polley situation. More specifically, the questions continued: if the current Canadian guidelines regarding tailings dam safety had been implemented, would the failure have been avoided. Before I answer these questions, let us first take a look at the guidelines that are out there. (more…)

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I have not posted on this blog the past few days.  The reason:  I was at a fly-in, fly-out camp where the internet connection is sporadic & they do not make it easy to access spurious blogs.   Plus the weather was terrible:  ice-rain in which planes could not fly. (more…)

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You remember Jill.  She is the philosophy major who is employed by an innovative mining company, MMC, to oversee risk management of the mining company’s geowaste facilities including the tailings, waste rock, and heap leach facilities. (more…)

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