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Archive for the ‘Tailings’ Category

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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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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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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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I have lost count of the number of radio stations, newspapers, and magazines that have contacted me asking for opinions on the Mt Polley tailings happenings.  Somehow the email from Adrian Lee of that most reputable of Canadian magazine, McLeans, had a air of intelligence the pulled me into replying.  (I confess to being a regular reader of McLeans.) (more…)

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Here are the stories of the seven dam failures that have occurred since the beginning of 2012. Six are failures of tailings facilities. The seventh is a rockfill dam. The following are extracts from technical papers that I wrote well before the Mt Polley failure. Details of the first three are available at this link. Details of the remaining four are in a paper that I will present at the Tailings and Mine Waste 2014 conference in Colorado in October of this year. (more…)

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So the legal trials and travails begin.  Here is the first announcement:

LONDON, Ontario–(BUSINESS WIRE)–Siskinds LLP today announced the commencement of an investor class action against Imperial Metals Corporation (“Imperial”) (TSX:III) and certain of its directors, officers and related parties. The action relates to the circumstances surrounding the failure of the tailings facilities at Imperial’s Mount Polley gold and copper mine near Likely, British Columbia on August 4, 2014.  The action is brought to recover losses suffered by persons who acquired common shares or notes of Imperial between August 15, 2011 and August 4, 2014.

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The Vancouver Sun reports as follows about the Mt Polley tailings failure:

Likely resident Gerald MacBurney worked at Mount Polley for seven years, the last two he says as a foreman directing work on the tailings dam.

He says AMEC instructed the company to bring in five million tonnes of rock to shore up the outside of the dam in order to handle the increased amount of water in the tailings pond.

He said the company never carried through, perhaps only bringing in one million tonnes of rock.

That’s because they didn’t want to take their large equipment — big haul trucks that can carry as much as 120 to 200 tonnes — away from delivering ore to the mill, according to MacBurney.

(more…)

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