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Posts Tagged ‘Tailings’

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Today I took the ferry across the bay from Puerto Santa Maria to Cadiz.  Took a bike and rode around the city sea-wall and around the old city center.  It is a great ride around the sea-wall.  It reminds one of the age of some engineering works. For here we have fortifications that have been four hundred years in the making.  I saw forts and castles built three hundred years ago to defend the city from the French, the Brits, and the Dutch, who attacked at different times.

It reminds us that closure of tailings facilities for 100 or even 200 years is but the outcome of the short history of North America, and not something founded in a profound perspective of real long-term history.  Clearly we can build facilities that last four-hundred years.  The people of Cadiz did.

True defense of their small city was a survival issue.  And true that closure of most mine tailings facilities is not anybody’s defense or survival issue.  I accept that social  utility may be the basis of a rejection of a long closure performance period.  But after seeing what I saw today, I cannot accept the reason too often given: we do not know how and cannot do it.

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This picture and the others in this posting were taken by me at Knotsberry Farm in California.
A great place to visit and enjoy a terrifying ride along the raging river of insanity.

If you seek a thorough and intelligent analysis of dealing with uranium mill sites (and particularly the tailings facility) take a look at the following–it is an amazingly comprehensive document–and should be required reading for all involved in mine management, regardless of whether the mine is uranium, copper, gold, or something else. (more…)

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A million here.  A million there.  Who cares?  It is just taxpayer money spent by your local government providing the services you expect to be provided at no cost!  Just learnt that HATCH has been awarded a contract by the BC Ministry of Energy and Mines (MEM) to review the independent reviews of BC tailings dams that MEM ordered pursuant to the failure of Mt Polley. (more…)

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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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