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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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The best read of the week is at this link where you can read the stories of mining engineering students at the University of Arizona College of Engineering.  The stories are about their internships.  As the site notes by way of introduction: (more…)

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Woke up late this morning after twelve hours sleep—seems the older I get the more I want to sleep.  Maybe it is old age or maybe riding my bicycle to work tires out the old body.  Or maybe there is something breaking down inside that the doctors cannot discern. (more…)

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I have written extensively in this blog about the Alberta Directive 74. Generally I have been derogatory about the Directive. For example at this link I write the following: (more…)

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To end the week, here are a few unrelated postings on the web about things mining. At this link, David Stockman of North American Business Development gives an interview on the topic Dry Tailings Stack vs Wet Tailings Pond.  Make sure to click on the rather obscure play buttons to hear him tell how Mt Polley could have been avoided had it been a dry stack and not a wet pond. At this link is a video showing Pascal Saunier and family singing.  Pascal is of Draintube fame and was one of the presenters at this week’s conference on Geosynthetics in Mining. At this link, available for download is RepRisk’s report on the Ten Most Controversial Mining Projects.  Mt Polley and Obed Mountain of Canada are included.  Here is what they say of Obed Mountain in case you forgot about this one: (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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We have just finished the InfoMine Conference on geosynthetics in mining.  I think it was a success although I had better await the evaluation forms before coming to definitive conclusions. The proceedings will be available through the InfoMine e-Store at this link.  In my opinion, this is a magnificent collection of papers on a topic that has long cried for detailed, focussed attention. For the use of geosynthetics in mining is different to the use of geosynthetics in landfills and other civil engineering application.  The mining projects that involve the use of geosynthetics are orders of magnitude larger than any other category of projects.  The challenges are greater: there are few precedents; there are no substantive regulations; and the consequences of use and misuse are greater. (more…)

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