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Posts Tagged ‘Tailings’

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A simple cover for a tailings facility may be no more than a layer of compacted tailings overlain by soil in which vegetation can grow. If control of infiltration is not required, this cover may be cost effective.   If the climate of the site is good, the layer of soil thick, and the vegetation abundant, you may have an evapotranspirative cover that limits infiltration. (more…)

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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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I write this fifty percent in jest, fifty percent in earnest, fifty percent with tounge in cheek, and fifty percent as a concerned citizen.  You decide which is which in what follows, for I cannot decide.  After the failure of the Bafokeng tailings facility, we built a dike across the failed area and picked up the tailings on the mine property.  We put these picked-up tailings back in the slimes dam.  Then we built a rockfill dike with an upstream filter across the valley just at the edge of the mine property.  Thus any tailings we did not pick up were washed down to the dike and were in due course picked up and put back in the slimes dam.  In due course, they filled in the failure volume with new tailings as the mine continued production. (more…)

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While we in BC have been preoccupied by the Mt Polley situation, yet another tailings failure has occurred.  This time in Mexico.  That brings the number of failures this year to three:  Duke Energy, Mt Polley, and Cananea.  Just the right number if the probability of failure is one in five thousand. (more…)

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We are heartened by today’s announcements re the Mt Polley tailings facility failure.   I particular we applaud the choice of experts retained to do the engineering review. (more…)

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Subaqueous disposal means placement of tailings into or beneath a water cover. Deposition of tailings into a lake is the most common subaqueous method. In many instances the embankment dam is constructed as a water retaining structure and the impoundment is filled with water into which the tailings are discharged. (more…)

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Mike Jacobs of Goldcorp presented the keynote address today at Paste 2014 in Vancouver.  His topic:  Where mining meets the public–and why water is so important? He told us that Goldcorp annually publishes the statistics of the use of water at all its mines.  Commendable. Then he told us of the First Nations prayer ceremonies at the opening and closing of water seasons at their mines.  Incredible. (more…)

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