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The numbers just do not add up. As I read the many sites on the web, I learn that British Columbia has about thirty operating mines. The BC government has about $172 million in closure bonds. Say about five or six million a mine. That seems grossly inadequate to me. I have just finished estimating closure of one mine and it came to nearly $60 million. Does this mean BC should have $1.7 billion in closure bonds? Here are some observations from various websites that may help you ponder this issue. Continue Reading »

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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. Continue Reading »

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As a result of postings on this blog, I get private emails from people on almost every topic.  Here is one such email that is a cry from the heart, a sad tale, related to mining, and so difficult that I cannot answer it.  I have the sender of the email’s permission to post the following in the hope that somebody, maybe one of the blog’s readers can help. Continue Reading »

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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. Continue Reading »

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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. Continue Reading »

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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.) Continue Reading »

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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. Continue Reading »

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