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Posts Tagged ‘Tailings’

bruce lake

Read today the news that the Brucejack Mine have been given an environmental assessment certificate by the British Columbia Ministry of the Environment.   The regulators say construction can begin once they are sure that discharges from water treatment plants will not harm the Unuk River.  Some of the tailings will go back underground; some will go to Brucejack Lake which is apparently “fishless.”  Most of the waste rock will go to the lake. (more…)

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Here are links to a few of many publications and presentations for the USACE of the topic of risk assessment of dams and levees.  Katrina forced them to think hard and deep.  This is a snapshot of the work.

Risk-Informed Approach to Flood-Induced Dam and Levee Failures

Risk Management Guidelines, Prioritization, and Process

USACE Levee Safety Program

The questions that arise are: Should the mining industry adopt similar criteria, methods, and results?  Should the Canadian Dam Association be leading the way on this?  How will we be able to justify a significantly different approach?

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DSCF5874

The snow blanketed us today as the Denver Society of Mining Engineers convention begun.  Yet it is warm enough to walk through the snow in shirt sleeves.  Typical Denver in winter/spring. Yesterday I attended the short course on Seismic Engineering for Tailings Dams.  It was well-attended and featured magnificent speakers who brought us up-to-date with current practice in predicting earthquakes and analyzing their impact on mine tailings dams.   Of course there was discussion of predicting the maximum credible earthquake, which Jonathan Bray says we are doing it wrong.  Contact me if you want the details. (more…)

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DSCF5793

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. (more…)

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DSCF4423

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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DSCF4660

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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