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Archive for the ‘Waste Rock’ Category

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The exterior surface of most tailings, waste rock, and heap leach facilities include:

  • A top deck which is the flatter surface that forms the top surface of the facility. This is usually sloped at between one and five percent, primarily to promote runoff.
  • The sideslopes which are easily covered if they are inclined at about five horizontal to one vertical (5H:1V) but which in practice may be as steep as 1.4H:1V.

Covers on the top deck are less subject to erosion, slope instability, and soil creep than covers on sideslopes. Thus different covers may be appropriate at the same facility on the top deck as compared to the sideslopes.  Here are a few idle thoughts on sideslope covers for mine waste facilities. (more…)

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Next week in Brazil is the first InfoMine conference on Mine Closure.  About ninety folk will gather to discuss mine closure in Brazil and South America.  I have read the papers: not a lot of fascination to the rest of us.  Mostly about the theory and postulated future of mine closure laws & regulations in countries that currently have none. The middle of May, I present an EduMine webcast on Mine Closure.  In the  webcast I will review the best few papers from the Brazil conference.  I will also present current case histories of mine closure that I am working on.  And I will go through the theory and practice and issues of mine closure in general.  Come join me. (more…)

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There is still time to join us for the upcoming EduMine webcast Advanced Tailings and Mine Waste Facility Design, Operation, and Closure.  Here is the link to the course. Even if you have taken other courses before conferences, or the other EduMine webcast on Introduction to Tailings, or our previous Advanced Tailings courses, I know you will find interesting and exciting information, perspectives, practices, and case histories in this new course. (more…)

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Spent today in a course on Covers in Cold Climates.  The course is part of the seminar to follow tomorrow and Wednesday on the same topics.  Arranged by InfoMine, it is being held in Whistler, which is a nice, but not spectacular place to have a conference—I prefer Banff or Vancouver.   For the Fairmont Chateau Whistler is a pale reflection of those other grand hotels with the Fairmont name: a bland and ugly exterior that replicates in cheap detail the features of the hotel in Vancouver that it tries to emulate. (more…)

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It is snowing in Vancouver.  Nothing sticking to the roads, but the trees are white and beautiful.  Nothing much to do outside or inside for that matter, so just  a few thoughts on mine waste disposal facility covers.

Slimes & Cement

The best cover is no cover.  If you can use the upper tailings or waste rock as the as the growth medium in which a stand of climax vegetation will flourish, you have the best cover. (more…)

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Every so often a presentation at a conference takes your breath away and leaves you amazed at the ability of the speaker and their colleagues. This happened today as a sat listening to Joel Carrasco of Ausenco present on a paper entitled Development of an integrated mine waste management plan of the metates gold-silver project, Durango and Sinaloa States, Mexico.   To get the paper, you will have to get the proceedings of the Tailings and Mine Waste Management 2013 conference or in due course download the presentation that I refer to from the website of the conference–I told it will take week or two to load pdfs of the presentations. (more…)

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In addition to blogging, I consult to the mining industry.  And I work with Andy Robertson who also owns InfoMine to promote conferences — something InfoMine has decided to undertake in a big way. A few months ago, Andy asked me what topic I thought would make for a good conference.  A short reflection and I suggested geosynthetics in mining.   Way back in 1974 or thereabouts, I became familiar with geosynthetics when i used Bidim to make the base of a tailings facility in South Africa.  I became very familiar with geosynthetics about five years ago when Andy and I suggested geotextiles and geogrid placed on frozen tailings for the Suncor Pond 5 cover base.  In between, I have designed geogrid reinforced slopes, built reinforced walls, placed covers and liners, and read about geosynthetics.  (more…)

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